{"id":90189,"date":"2026-08-04T19:49:32","date_gmt":"2026-08-04T11:49:32","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/90189.html"},"modified":"2026-08-04T19:49:32","modified_gmt":"2026-08-04T11:49:32","slug":"%e5%88%9d%e8%af%86php","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/90189.html","title":{"rendered":"\u521d\u8bc6PHP"},"content":{"rendered":"

\u4e00\u3001PHP\u6807\u51c6\u8bed\u8a00\u683c\u5f0f<\/h2>\n

PHP\u8bed\u8a00\u6807\u8bb0：<\/p>\n

<?php \/\/ PHP \u7684\u5f00\u59cb\u6807\u8bb0，\u8868\u793a\u4ece\u6b64\u6807\u8bb0\u5f00\u59cb，\u8fdb\u5165PHP \u6a21\u5f0f\u3002
\n phpinfo(); \/\/ PHP \u4ee3\u7801
\n \/\/ PHP \u7684\u7ed3\u675f\u6807\u8bb0，\u8868\u793a\u4ece\u5f00\u59cb\u6807\u8bb0\u5230\u7ed3\u675f\u6807\u8bb0，\u4e4b\u95f4\u7684\u5185\u5bb9\u662fPHP \u6a21\u5f0f
\n \/\/ \u4e4b\u540e\u7684\u5185\u5bb9\u4f9d\u7136\u88abPHP \u89e3\u91ca\u5f15\u64ce\u8ba4\u4e3a\u662f\u7eaf\u6587\u672c\u5b57\u7b26\u4e32\u3002
\n?><\/p>\n

PHP\u7528\u901a\u4fd7\u7684\u8bdd\u6765\u8bb2\u5b83\u662f\u6bd4\u8f83\u968f\u610f\u7684\u4e00\u4e2a\u8bed\u8a00，\u5728PHP\u6587\u4ef6\u4e2d，\u91cc\u9762\u53ef\u4ee5\u63ba\u6742\u7740HTML\u548cJavaScript\u8fdb\u884c\u6df7\u7f16\u3002<\/p>\n

PHP\u7684\u5f00\u59cb\u6807\u8bb0\u4e3a：<?php \u7ed3\u675f\u6807\u8bb0\u4e3a：?> ，\u5206\u53f7;\u4ee3\u8868\u4e00\u53e5\u8bdd\u4ee3\u7801\u7ed3\u675f\u3002\/\/\u4ee3\u8868\u6ce8\u91ca，\/\/\u540e\u9762\u7684\u5185\u5bb9\u4e0d\u4f1a\u88ab\u6267\u884c\u3002\u800c\u5728\u8fd9\u6807\u8bb0\u4e4b\u5916\u7684\u5185\u5bb9，\u5b83\u4eec\u4f1a\u88ab\u5f53\u4f5c\u5b57\u7b26\u8f93\u51fa\u5230\u6d4f\u89c8\u5668\u4e2d\u3002\u4f8b\u5982：<\/p>\n

\"\"<\/p>\n

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<?php<\/p>\n

$a = 10;<\/p>\n

$b = "20test";<\/p>\n

echo $a + $b;<\/p>\n

?><\/p>\n

\"\"<\/p>\n

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\u4e09\u3001\u53ef\u53d8\u53d8\u91cf<\/h2>\n

<?php<\/p>\n

$user = "hack123";<\/p>\n

$admin = "\u5bc6\u7801123456";<\/p>\n

echo $$user;<\/p>\n

?><\/p>\n

\"\"<\/p>\n

\u5148\u8ba1\u7b97\u5185\u5c42\u53d8\u91cf $user，\u5f97\u5230\u5b57\u7b26\u4e32\u503c "hack123"\u3002\u5c06 "hack123" \u4f5c\u4e3a\u65b0\u7684\u53d8\u91cf\u540d，\u53bb\u67e5\u627e\u540d\u4e3a $hack123 \u7684\u53d8\u91cf\u3002\u56e0\u4e3a\u4ece\u672a\u7ed9 $hack123 \u8d4b\u503c，\u67e5\u627e\u5931\u8d25，\u6240\u4ee5\u4f1a\u62a5\u9519\u3002<\/p>\n

\u53ef\u4ee5\u7528\u6570\u5b66\u65b9\u9762\u8fd9\u6837\u7406\u89e3：\u2235$user=hack123 \u2234$$user=$($user)=$hack123\u3002\u4f46\u56e0\u4e3a\u6ca1\u6709\u5b9a\u4e49$hack123\u7684\u503c，\u6240\u4ee5\u5b83\u8ba4\u4e0d\u51fa\u8c01\u662f$hack123，\u7136\u540e\u5bfc\u81f4\u62a5\u9519\u3002<\/p>\n

\n

<?php<\/p>\n

$name = "flag";<\/p>\n

$flag = "this_is_secret_flag";<\/p>\n

$$name = "hacker_get_flag";<\/p>\n

echo $flag;<\/p>\n

?><\/p>\n

\"\"<\/p>\n

\u8fd9\u662f\u4e00\u4e2a\u5199\u5165\u64cd\u4f5c，\u76f4\u63a5\u4fee\u6539\u4e86\u540d\u4e3a flag \u7684\u53d8\u91cf\u3002<\/p>\n

\u56e0\u4e3a\u6709$name=flag \u6240\u4ee5$$name=$flag，\u4f46\u6700\u540e\u5199\u5165\u7684\u662f$$name=\u201dhacker_get_flag\u201d;<\/p>\n

\u6240\u4ee5$flag=hacker_get_flag<\/p>\n

\n

\u53ef\u53d8\u53d8\u91cf\u4e3a\u4ec0\u4e48\u4f1a\u4ea7\u751f\u53d8\u91cf\u8986\u76d6\u6f0f\u6d1e？<\/p>\n

\u5982\u679c\u7a0b\u5e8f\u4ece\u7528\u6237\u8f93\u5165（\u5982 $_GET, $_POST, $_COOKIE）\u4e2d\u83b7\u53d6\u6570\u636e，\u5e76\u76f4\u63a5\u6216\u95f4\u63a5\u5730\u7528\u4e8e\u521b\u5efa\u53ef\u53d8\u53d8\u91cf，\u653b\u51fb\u8005\u5c31\u53ef\u4ee5\u901a\u8fc7\u63a7\u5236\u8f93\u5165\u6765\u8986\u76d6\u7a0b\u5e8f\u4e2d\u7684\u4efb\u610f\u53d8\u91cf\u3002\u7b80\u5355\u7684\u6765\u8bf4\u5f53\u7528\u6237\u53ef\u63a7\u7684\u6570\u636e\u88ab\u4e0d\u5f53\u5730\u7528\u4f5c\u53ef\u53d8\u53d8\u91cf\u7684\u540d\u79f0\u65f6，\u653b\u51fb\u8005\u53ef\u4ee5\u8986\u76d6\u4efb\u4f55\u5df2\u5b58\u5728\u7684\u53d8\u91cf，\u4ece\u800c\u7834\u574f\u7a0b\u5e8f\u7684\u903b\u8f91\u6216\u6570\u636e\u3002<\/p>\n

\u56db\u3001\u5e03\u5c14\u8f6c\u6362\u9ed1\u540d\u5355\u503c<\/h2>\n

<?php<\/p>\n

$arr = [false, 0, 0.0, "", "0", [], NULL, "abc", 99, 3.14];<\/p>\n

foreach($arr as $v){<\/p>\n

\u00a0\u00a0\u00a0\u00a0if($v){<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0echo var_dump($v)." \u2192 \u771f<br>";<\/p>\n

\u00a0\u00a0\u00a0\u00a0}else{<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0echo var_dump($v)." \u2192 \u5047<br>";<\/p>\n

\u00a0\u00a0\u00a0\u00a0}<\/p>\n

}<\/p>\n

?><\/p>\n

\"\"<\/p>\n

10\u79cd\u4e0d\u540c\u6570\u636e\u7c7b\u578b\u7684\u6570\u7ec4，\u7136\u540e\u7528 foreach \u904d\u5386\u6bcf\u4e2a\u5143\u7d20，\u5728 if \u5224\u65ad\u4e2d\u9a8c\u8bc1\u5b83\u4eec\u81ea\u52a8\u8f6c\u6362\u540e\u7684\u5e03\u5c14\u503c\u662f\u771f\u8fd8\u662f\u5047，\u5e76\u901a\u8fc7 var_dump() \u8f93\u51fa\u6bcf\u4e2a\u503c\u7684\u539f\u59cb\u7c7b\u578b\u548c\u5185\u5bb9，\u4ee5\u6b64\u76f4\u89c2\u5c55\u793a PHP \u7684\u5047\u503c\u5217\u8868\u548c\u7c7b\u578b\u81ea\u52a8\u8f6c\u6362\u89c4\u5219\u3002<\/p>\n

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\n

\u7c7b\u578b<\/span><\/p>\n<\/td>\n

\n

\u503c<\/span><\/p>\n<\/td>\n

\n

\u793a\u4f8b<\/span><\/p>\n<\/td>\n<\/tr>\n

\n

\u5e03\u5c14<\/span><\/p>\n<\/td>\n

\n

false \u672c\u8eab<\/span><\/p>\n<\/td>\n

\n

if(false) \u2192 \u5047<\/span><\/p>\n<\/td>\n<\/tr>\n

\n

\u6574\u6570<\/span><\/p>\n<\/td>\n

\n

0<\/span><\/p>\n<\/td>\n

\n

if(0) \u2192 \u5047<\/span><\/p>\n<\/td>\n<\/tr>\n

\n

\u6d6e\u70b9\u6570<\/span><\/p>\n<\/td>\n

\n

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\n

if(0.0) \u2192 \u5047<\/span><\/p>\n<\/td>\n<\/tr>\n

\n

\u5b57\u7b26\u4e32<\/span><\/p>\n<\/td>\n

\n

""（\u7a7a\u5b57\u7b26\u4e32）<\/span><\/p>\n<\/td>\n

\n

if("") \u2192 \u5047<\/span><\/p>\n<\/td>\n<\/tr>\n

\n

\u5b57\u7b26\u4e32<\/span><\/p>\n<\/td>\n

\n

"0"（\u5b57\u7b260）<\/span><\/p>\n<\/td>\n

\n

if("0") \u2192 \u5047<\/span><\/p>\n<\/td>\n<\/tr>\n

\n

\u6570\u7ec4<\/span><\/p>\n<\/td>\n

\n

[]（\u7a7a\u6570\u7ec4）<\/span><\/p>\n<\/td>\n

\n

if([]) \u2192 \u5047<\/span><\/p>\n<\/td>\n<\/tr>\n

\n

NULL<\/span><\/p>\n<\/td>\n

\n

NULL<\/span><\/p>\n<\/td>\n

\n

if(NULL) \u2192 \u5047<\/span><\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u9664\u6b64\u4ee5\u5916\u7684\u6240\u6709\u503c，\u90fd\u662f true（\u771f\u503c）\u3002<\/p>\n

\u4e94\u3001\u5355\u5f15\u53f7\/\u53cc\u5f15\u53f7\/\u5b9a\u754c\u7b26<\/h2>\n

<?php<\/p>\n

$name = "xiu";<\/p>\n

$str1 = 'hello $name ,\\\\'test\\\\'';<\/p>\n

echo $str1;<\/p>\n

\"\"<\/p>\n

\u5355\u5f15\u53f7\u5b57\u7b26\u4e32\u4e2d\u7684\u53d8\u91cf\u4e0d\u4f1a\u88ab\u89e3\u6790，\u7279\u6b8a\u5b57\u7b26\u53ea\u6709\u53cd\u659c\u6760 \\\\ \u7528\u4e8e\u8f6c\u4e49\u5355\u5f15\u53f7 \\\\' \u548c\u53cd\u659c\u6760\u672c\u8eab \\\\\\\\\u3002<\/p>\n

<?php<\/p>\n

$name = "xiu";<\/p>\n

$str2 = "hello {$name},\\\\"test\\\\"";<\/p>\n

echo $str2;<\/p>\n

?><\/p>\n

\"\"<\/p>\n

\u53cc\u5f15\u53f7\u5b57\u7b26\u4e32\u4e2d\u7684\u53d8\u91cf\u4f1a\u88ab\u89e3\u6790\u3002{$name} \u662f\u4e00\u79cd\u660e\u786e\u544a\u8bc9PHP\u89e3\u6790\u5668\u8fd9\u662f\u4e00\u4e2a\u53d8\u91cf\u7684\u5199\u6cd5，\u5c24\u5176\u5728\u53d8\u91cf\u540d\u7d27\u6328\u7740\u5176\u4ed6\u5b57\u7b26\u65f6\u5f88\u6709\u7528\u3002<\/p>\n

<?php<\/p>\n

$title = "php\u6e17\u900f\u7ec3\u4e60";<\/p>\n

$html = <<<HTML<\/p>\n

<h1>yemianbiaoti: {$title}<\/h1><\/p>\n

<script><\/p>\n

console.log("\u5b9a\u754c\u7b26\u65e0\u9700\u8f6c\u4e49\u5355\u53cc\u5f15\u53f7！");<\/p>\n

<\/script><\/p>\n

HTML;<\/p>\n

echo $html;<\/p>\n

?><\/p>\n

\"\"<\/p>\n

\u8f93\u51fa\u4e00\u6bb5HTML，\u5176\u4e2d <h1> \u6807\u7b7e\u5185\u663e\u793a\u4e86 "PHP\u6e17\u900f\u7ec3\u4e60"\u3002<<<HTML \u8868\u793a\u5f00\u59cb\u4e00\u4e2a\u540d\u4e3a "HTML" \u7684\u591a\u884c\u5b57\u7b26\u4e32，HTML; \u8868\u793a\u7ed3\u675f\u3002\u8fd9\u79cd\u8bed\u6cd5\u8ba9\u4f60\u80fd\u65b9\u4fbf\u5730\u8f93\u51fa\u5927\u6bb5 HTML\/JavaScript \u4ee3\u7801，\u4e14\u65e0\u9700\u8f6c\u4e49\u5f15\u53f7，{$title} \u4f1a\u88ab\u66ff\u6362\u4e3a\u53d8\u91cf\u7684\u503c\u3002<\/p>\n

1. \u8f93\u51fa\u53d8\u91cf\u65f6`{$name}`\u5927\u62ec\u53f7\u4f5c\u7528\u662f\u4ec0\u4e48？\u4e0d\u52a0\u4f1a\u51fa\u73b0\u4ec0\u4e48\u95ee\u9898？<\/p>\n

\u4f5c\u7528：\u660e\u786e\u754c\u5b9a\u53d8\u91cf\u540d\u7684\u8fb9\u754c\u3002<\/p>\n

\u95ee\u9898：\u5982\u679c\u4e0d\u52a0\u5927\u62ec\u53f7，PHP\u4f1a\u5c3d\u53ef\u80fd\u591a\u5730\u541e\u5e76\u5b57\u7b26\u4f5c\u4e3a\u53d8\u91cf\u540d\u3002\u4f8b\u5982 "hello $name123"，PHP\u4f1a\u8ba4\u4e3a\u53d8\u91cf\u662f $name123 \u800c\u4e0d\u662f $name，\u5bfc\u81f4\u627e\u4e0d\u5230\u53d8\u91cf\u800c\u62a5\u9519\u3002\u5927\u62ec\u53f7\u53ef\u4ee5\u907f\u514d\u8fd9\u79cd\u6b67\u4e49\u3002<\/p>\n

2. \u5927\u6bb5\u6df7\u5408HTML\u3001JS\u4ee3\u7801\u65f6，\u4f18\u5148\u7528\u54ea\u79cd\u5b57\u7b26\u4e32\u683c\u5f0f？<\/p>\n

\u9996\u9009$\u53d8\u91cf = <<<\u6807\u8bb0\u540d <\/span><\/p>\n

\u6587\u672c\u5185\u5bb9（\u53ef\u4ee5\u5305\u542b\u53d8\u91cf {$\u53d8\u91cf\u540d}）<\/span><\/p>\n

\u6807\u8bb0\u540d;<\/span><\/p>\n

\u6216<\/p>\n

$\u53d8\u91cf = <<<'\u6807\u8bb0\u540d' \u6ce8\u610f：\u6807\u8bb0\u540d\u7528\u5355\u5f15\u53f7\u5305\u88f9<\/span><\/p>\n

\u6587\u672c\u5185\u5bb9（\u53d8\u91cf\u4e0d\u4f1a\u88ab\u89e3\u6790）<\/span><\/p>\n

\u6807\u8bb0\u540d;<\/span><\/p>\n

<<<HTML\u7684\u884c\u4e3a\u7c7b\u4f3c\u4e8e\u53cc\u5f15\u53f7，\u53ef\u4ee5\u89e3\u6790\u53d8\u91cf，\u5e76\u4e14\u5185\u90e8\u7684\u53cc\u5f15\u53f7\u3001\u5355\u5f15\u53f7\u90fd\u65e0\u9700\u8f6c\u4e49，\u975e\u5e38\u9002\u5408\u8f93\u51fa\u5927\u6bb5\u7684\u3001\u5305\u542b\u5927\u91cf\u5f15\u53f7\u548c\u6362\u884c\u7b26\u7684HTML\/JS\u4ee3\u7801，\u53ef\u8bfb\u6027\u6700\u597d\u3002<\/p>\n

\u5355\u5f15\u53f7：\u6027\u80fd\u6700\u597d，\u4e0d\u89e3\u6790\u53d8\u91cf，\u53ea\u8f6c\u4e49 \\\\' \u548c \\\\\\\\\u3002<\/p>\n

\u53cc\u5f15\u53f7：\u6027\u80fd\u6b21\u4e4b，\u89e3\u6790\u53d8\u91cf，\u8f6c\u4e49\u591a\u79cd\u7279\u6b8a\u5b57\u7b26（\u5982 \\\\n, \\\\t, \\\\" \u7b49）\u3002<\/p>\n

\u5b9a\u754c\u7b26：\u9002\u5408\u591a\u884c\u6587\u672c，\u884c\u4e3a\u7c7b\u4f3c\u53cc\u5f15\u53f7\u6216\u5355\u5f15\u53f7\u3002<\/p>\n

\u5927\u62ec\u53f7\u8bed\u6cd5： \u660e\u786e\u53d8\u91cf\u8fb9\u754c，\u63d0\u9ad8\u4ee3\u7801\u53ef\u8bfb\u6027\u548c\u5065\u58ee\u6027\u3002<\/p>\n

\u516d\u3001\u9b54\u672f\u5e38\u91cf<\/h2>\n

<?php<\/p>\n

echo "\u5f53\u524d\u6587\u4ef6\u5b8c\u6574\u8def\u5f84：".__FILE__."<br>";<\/p>\n

echo "\u5f53\u524d\u4ee3\u7801\u884c\u53f7：".__LINE__."<br>";<\/p>\n

echo "PHP\u7248\u672c：".PHP_VERSION."<br>";<\/p>\n

echo "\u64cd\u4f5c\u7cfb\u7edf：".PHP_OS."<br>";<\/p>\n

echo "\u76ee\u5f55\u5206\u9694\u7b26：".DIRECTORY_SEPARATOR;<\/p>\n

?><\/p>\n

\"\"<\/p>\n

\n

\u98ce\u9669：\u66b4\u9732\u7f51\u7ad9\u6839\u76ee\u5f55，\u653b\u51fb\u8005\u53ef\u4ee5\u5f97\u77e5\u7f51\u7ad9\u6587\u4ef6\u5728\u670d\u52a1\u5668\u4e0a\u7684\u7edd\u5bf9\u8def\u5f84（\u5982 \/var\/www\/html\/project\/app\/controller\/index.php）\u3002<\/p>\n

\u7f51\u7ad9\u5bf9\u5916\u66b4\u9732 __FILE__ \u8def\u5f84\u4f1a\u9020\u6210\u5de8\u5927\u7684\u5b89\u5168\u98ce\u9669\u3002\u8fd9\u5c5e\u4e8e\u4fe1\u606f\u6cc4\u9732\u6f0f\u6d1e\u3002<\/p>\n

\u8f85\u52a9\u5176\u4ed6\u653b\u51fb：\u8fd9\u4e2a\u8def\u5f84\u4fe1\u606f\u53ef\u4ee5\u4e0e\u5176\u4ed6\u6f0f\u6d1e（\u5982SQL\u6ce8\u5165\u3001\u6587\u4ef6\u5305\u542b\u3001\u672c\u5730\u6587\u4ef6\u5305\u542b LFI）\u7ed3\u5408\u4f7f\u7528，\u5e2e\u52a9\u653b\u51fb\u8005\u66f4\u7cbe\u786e\u5730\u5b9a\u4f4d\u548c\u8bfb\u53d6\u654f\u611f\u6587\u4ef6（\u5982\u914d\u7f6e\u6587\u4ef6config.php，\u5305\u542b\u6570\u636e\u5e93\u5bc6\u7801\u7b49）\u3002<\/p>\n

\u793e\u4f1a\u5de5\u7a0b\u5b66：\u66b4\u9732\u4e86\u5f00\u53d1\u6846\u67b6\u3001\u76ee\u5f55\u7ed3\u6784，\u4e3a\u540e\u7eed\u66f4\u6df1\u5165\u7684\u653b\u51fb\u63d0\u4f9b\u4e86\u4fe1\u606f\u57fa\u7840\u3002<\/p>\n

\u9b54\u672f\u5e38\u91cf：__FILE__, __LINE__, __DIR__ \u7b49，\u5b83\u4eec\u4f1a\u968f\u7740\u4ee3\u7801\u4f4d\u7f6e\u7684\u53d8\u5316\u800c\u53d8\u5316，\u63d0\u4f9b\u4e0a\u4e0b\u6587\u4fe1\u606f\u3002<\/p>\n

\u9884\u5b9a\u4e49\u5e38\u91cf：PHP_VERSION, PHP_OS, DIRECTORY_SEPARATOR \u7b49，\u63d0\u4f9b\u4e86PHP\u73af\u5883\u548c\u64cd\u4f5c\u7cfb\u7edf\u7684\u4fe1\u606f\u3002<\/p>\n

\u5b89\u5168\u98ce\u9669：\u6c38\u8fdc\u4e0d\u8981\u5728\u7ebf\u4e0a\u73af\u5883\u76f4\u63a5\u8f93\u51fa\u8fd9\u4e9b\u654f\u611f\u4fe1\u606f\u3002phpinfo() \u51fd\u6570\u66f4\u662f\u4fe1\u606f\u6cc4\u9732\u7684"\u91cd\u707e\u533a"，\u751f\u4ea7\u73af\u5883\u52a1\u5fc5\u7981\u7528\u3002<\/p>\n

\u4e03\u3001== \u4e0e ===<\/h2>\n

<?php<\/p>\n

var_dump("123abc" == 123);<\/p>\n

var_dump("123abc" === 123);<\/p>\n

var_dump("0" == false);<\/p>\n

var_dump("0" === false);<\/p>\n

var_dump([] == false);<\/p>\n

var_dump(NULL == "");<\/p>\n

var_dump(NULL === "");<\/p>\n

?><\/p>\n

\"\"<\/p>\n

==：\u677e\u6563\u6bd4\u8f83\u3002\u6bd4\u8f83\u524d\u4f1a\u8fdb\u884c\u7c7b\u578b\u8f6c\u6362\u3002<\/p>\n

"123abc" \u8f6c\u6570\u5b57\u662f 123，\u6240\u4ee5 123 == 123 \u4e3a true\u3002<\/p>\n

"0" \u8f6c\u5e03\u5c14\u662f false，\u6240\u4ee5 false == false \u4e3a true\u3002<\/p>\n

\u7a7a\u6570\u7ec4 [] \u8f6c\u5e03\u5c14\u662f false，\u6240\u4ee5 false == false \u4e3a true\u3002<\/p>\n

NULL \u8f6c\u5b57\u7b26\u4e32\u662f\u7a7a\u5b57\u7b26\u4e32 ""，\u6240\u4ee5 "" == "" \u4e3a true\u3002<\/p>\n

===：\u4e25\u683c\u6bd4\u8f83\u3002\u8981\u6c42\u503c\u548c\u7c7b\u578b\u90fd\u5b8c\u5168\u76f8\u540c\u3002<\/p>\n

"123abc" \u662f\u5b57\u7b26\u4e32，123 \u662f\u6574\u6570，\u7c7b\u578b\u4e0d\u540c，\u4e3a false\u3002<\/p>\n

"0" \u662f\u5b57\u7b26\u4e32，false \u662f\u5e03\u5c14，\u7c7b\u578b\u4e0d\u540c，\u4e3a false\u3002<\/p>\n

NULL \u548c\u7a7a\u5b57\u7b26\u4e32\u7c7b\u578b\u4e0d\u540c，\u4e3a false\u3002<\/p>\n

\u4f8b\u5982：if ($_POST['password'] == $db_password)\u3002<\/p>\n

\u5982\u679c\u6570\u636e\u5e93\u4e2d\u7684\u5bc6\u7801\u662f\u7eaf\u6570\u5b57，\u6bd4\u5982 0\u3002<\/p>\n

\u653b\u51fb\u8005\u53ef\u4ee5\u63d0\u4ea4password=0，\u4e24\u8005\u90fd\u4e3a\u6570\u5b570，\u901a\u8fc7\u9a8c\u8bc1\u3002<\/p>\n

\u66f4\u7ecf\u5178\u7684\u4f8b\u5b50\u662f，\u5982\u679c\u4f7f\u7528 == \u6bd4\u8f83，\u653b\u51fb\u8005\u63d0\u4ea4\u4e00\u4e2a\u7a7a\u6570\u7ec4 []，\u5b83\u53ef\u80fd\u88ab\u8f6c\u6362\u4e3a NULL \u6216 0，\u4ece\u800c\u7ed5\u8fc7\u3002<\/p>\n

\n

== \u4e0e ===： \u5728\u6d89\u53ca\u7528\u6237\u8f93\u5165\u6bd4\u8f83（\u5c24\u5176\u662f\u5bc6\u7801\u3001\u6743\u9650\u5224\u65ad）\u65f6，\u5fc5\u987b\u4f7f\u7528 ===，\u786e\u4fdd\u503c\u548c\u7c7b\u578b\u90fd\u5339\u914d，\u9632\u6b62\u56e0\u7c7b\u578b\u8f6c\u6362\u5bfc\u81f4\u7684\u5b89\u5168\u7ed5\u8fc7\u3002<\/p>\n

\u677e\u6563\u6bd4\u8f83\u89c4\u5219： \u8981\u719f\u6089\u5e38\u89c1\u7c7b\u578b\u5728 == \u4e0b\u7684\u8f6c\u6362\u7ed3\u679c，\u7279\u522b\u662f\u5b57\u7b26\u4e32\u4e0e\u6570\u5b57\u3001\u5e03\u5c14\u503c\u3001NULL\u4e4b\u95f4\u7684\u6bd4\u8f83\u3002<\/p>\n

\u516b\u3001\u53cd\u5f15\u53f7\u4e0e@<\/h2>\n

<?php<\/p>\n

$cmd = "ipconfig";<\/p>\n

echo "<pre>".`$cmd`."<\/pre>";<\/p>\n

?><\/p>\n

\"\"<\/p>\n

PHP \u4e2d\u7684\u53cd\u5f15\u53f7（`）\u662f\u4e00\u4e2a\u6267\u884c\u8fd0\u7b97\u7b26，\u7528\u4e8e\u6267\u884c\u7cfb\u7edf\u547d\u4ee4\u5e76\u83b7\u53d6\u5176\u8f93\u51fa，\u5176\u529f\u80fd\u7b49\u540c\u4e8e shell_exec()\u3002<\/p>\n

<?php<\/p>\n

echo $undefined_var;<\/p>\n

?><\/p>\n

\"\"<\/p>\n

<?php<\/p>\n

echo @$undefined_var;<\/p>\n

?><\/p>\n

\"\"<\/p>\n

1. \u76f4\u63a5\u5c06\u7528\u6237\u8f93\u5165\u653e\u5165\u53cd\u5f15\u53f7``\u4e2d\u4f1a\u4ea7\u751f\u4ec0\u4e48\u6f0f\u6d1e？<\/p>\n

\u4f1a\u4ea7\u751f\u547d\u4ee4\u6ce8\u5165\u6f0f\u6d1e\u3002\u5982\u679c\u7528\u6237\u8f93\u5165 ; rm -rf \/ \u6216 | whoami，PHP\u4f1a\u6267\u884c\u8fd9\u4e9b\u6076\u610f\u547d\u4ee4\u3002<\/p>\n

2. \u5f00\u53d1\u8005\u4f7f\u7528@\u5c4f\u853d\u62a5\u9519\u4f1a\u7ed9\u6e17\u900f\u6d4b\u8bd5\u5e26\u6765\u4ec0\u4e48\u963b\u788d？<\/p>\n

\u9690\u85cf\u8c03\u8bd5\u4fe1\u606f：\u6e17\u900f\u6d4b\u8bd5\u4eba\u5458\u901a\u5e38\u4f9d\u8d56\u62a5\u9519\u4fe1\u606f\u6765\u4e86\u89e3\u6570\u636e\u5e93\u7ed3\u6784\u3001\u6587\u4ef6\u8def\u5f84\u3001\u53d8\u91cf\u540d\u79f0\u7b49\u3002@ \u5c4f\u853d\u4e86\u8fd9\u4e9b\u4fe1\u606f，\u589e\u52a0\u4e86\u4fe1\u606f\u6536\u96c6\u7684\u96be\u5ea6\u3002<\/p>\n

\u9690\u853d\u6f0f\u6d1e：\u5c4f\u853d\u9519\u8bef\u53ef\u80fd\u4f1a\u63a9\u76d6\u4e00\u4e9b\u660e\u663e\u7684\u9519\u8bef，\u5982SQL\u67e5\u8be2\u5931\u8d25\u3001\u6587\u4ef6\u5305\u542b\u5931\u8d25\u7b49，\u4f7f\u653b\u51fb\u8005\u96be\u4ee5\u5b9a\u4f4d\u6f0f\u6d1e\u70b9\u3002<\/p>\n

\u963b\u788d\u5224\u65ad：\u653b\u51fb\u8005\u65e0\u6cd5\u901a\u8fc7\u4fee\u6539\u53c2\u6570\u89e6\u53d1\u62a5\u9519\u6765\u5224\u65ad\u4ee3\u7801\u6267\u884c\u6d41\u7a0b，\u9700\u8981\u82b1\u8d39\u66f4\u591a\u65f6\u95f4\u548c\u7cbe\u529b\u8fdb\u884c"\u9ed1\u76d2"\u6d4b\u8bd5\u3002<\/p>\n

\n

\u53cd\u5f15\u53f7：\u662f shell_exec() \u51fd\u6570\u7684\u522b\u540d，\u7528\u4e8e\u6267\u884c\u7cfb\u7edf\u547d\u4ee4，\u662f\u547d\u4ee4\u6267\u884c\u6f0f\u6d1e\u7684\u76f4\u63a5\u8f7d\u4f53\u3002<\/p>\n

\u9519\u8bef\u6291\u5236\u7b26 @：\u53ef\u4ee5\u5c4f\u853d\u8be5\u884c\u4ee3\u7801\u53ef\u80fd\u4ea7\u751f\u7684\u6240\u6709\u9519\u8bef\u3001\u8b66\u544a\u3001\u901a\u77e5\u3002\u5728\u751f\u4ea7\u73af\u5883\u4e2d\u8fc7\u5ea6\u4f7f\u7528\u4f1a\u4e25\u91cd\u963b\u788d\u8c03\u8bd5\u548c\u6f0f\u6d1e\u6392\u67e5\u3002<\/p>\n

\u5b89\u5168\u7f16\u7801：\u4e0d\u8981\u5c06\u7528\u6237\u8f93\u5165\u76f4\u63a5\u4f20\u9012\u7ed9\u53cd\u5f15\u53f7\u6216\u4efb\u4f55\u7cfb\u7edf\u6267\u884c\u51fd\u6570（\u5982 system(), exec() \u7b49）\u3002\u5fc5\u987b\u4f7f\u7528 escapeshellarg() \u6216 escapeshellcmd() \u8fdb\u884c\u4e25\u683c\u8fc7\u6ee4\u6216\u91c7\u7528\u767d\u540d\u5355\u65b9\u5f0f\u3002<\/p>\n

\n

\u4e5d\u3001switch\u548cbreak<\/h2>\n

<?php<\/p>\n

$week = 7;<\/p>\n

switch($week){<\/p>\n

\u00a0\u00a0\u00a0\u00a0case 1: echo "\u5468\u4e00"; break;<\/p>\n

\u00a0\u00a0\u00a0\u00a0case 2: echo "\u5468\u4e8c"; break;<\/p>\n

\u00a0\u00a0\u00a0\u00a0case 7: echo "\u5468\u65e5"; break;<\/p>\n

\u00a0\u00a0\u00a0\u00a0default: echo "\u975e\u6cd5\u661f\u671f";<\/p>\n

}<\/p>\n

?><\/p>\n

\"\"<\/p>\n

$week\u662f1-7\u7684\u968f\u673a\u6570，\u7a0b\u5e8f\u4f1a\u6b63\u5e38\u8f93\u51fa\u5bf9\u5e94\u7684\u661f\u671f\u51e0，\u5982\u679c\u4e0d\u5728\u8303\u56f4\u5185\u5219\u8f93\u51fa"\u975e\u6cd5\u661f\u671f"\u3002<\/p>\n

\"\"<\/p>\n

<?php<\/p>\n

$week = 7;<\/p>\n

switch($week){<\/p>\n

\u00a0\u00a0\u00a0\u00a0case 1: echo "\u5468\u4e00"; break;<\/p>\n

\u00a0\u00a0\u00a0\u00a0case 2: echo "\u5468\u4e8c"; break;<\/p>\n

\u00a0\u00a0\u00a0\u00a0case 7: echo "\u5468\u65e5"; break;<\/p>\n

\u00a0\u00a0\u00a0\u00a0default: echo "\u975e\u6cd5\u661f\u671f";<\/p>\n

}<\/p>\n

?><\/p>\n

\"\"<\/p>\n

\u7a0b\u5e8f\u4f1a\u6267\u884c case 1 \u7684\u4ee3\u7801\u5757（\u8f93\u51fa"\u5468\u4e00"），\u7136\u540e\u7ee7\u7eed\u7a7f\u900f\u6267\u884ccase 2\u76f4\u5230\u9047\u5230 break\u6216switch\u7ed3\u675f\u3002<\/p>\n

1.switch\u7f3a\u5c11break\u4f1a\u4ea7\u751f\u4ec0\u4e48\u903b\u8f91\u6f0f\u6d1e？<\/p>\n

\u903b\u8f91\u9519\u8bef：\u7a0b\u5e8f\u53ef\u80fd\u6267\u884c\u591a\u4e2acase\u5206\u652f，\u5bfc\u81f4\u8f93\u51fa\u6216\u64cd\u4f5c\u4e0d\u7b26\u5408\u9884\u671f\u3002<\/p>\n

\u6743\u9650\u7ed5\u8fc7：\u5728\u6743\u9650\u5224\u65ad\u7684switch \u4e2d，\u5982\u679c\u5fd8\u8bb0\u5199break，\u53ef\u80fd\u5bfc\u81f4\u666e\u901a\u7528\u6237"\u7a7f\u900f"\u5230\u7ba1\u7406\u5458\u7684case\u3002<\/p>\n

\n

2.break\u7684\u4f5c\u7528：\u7ec8\u6b62switch\u8bed\u53e5\u7684\u6267\u884c，\u9632\u6b62"\u7a7f\u900f"\u5230\u4e0b\u4e00\u4e2acase\u3002<\/p>\n

3.\u7a7f\u900f（Fall-through）：\u5728\u67d0\u4e9b\u7279\u6b8a\u573a\u666f\u4e0b，\u53ef\u4ee5\u5229\u7528\u7a7f\u900f\u7279\u6027\u6765\u7b80\u5316\u4ee3\u7801（\u6bd4\u5982\u591a\u4e2acase\u6267\u884c\u76f8\u540c\u7684\u64cd\u4f5c），\u4f46\u5728\u5927\u591a\u6570\u60c5\u51b5\u4e0b，\u5fd8\u8bb0\u52a0break\u662f\u903b\u8f91\u9519\u8bef\u7684\u6765\u6e90\u3002<\/p>\n<\/p>\n

\u5341\u3001\u5faa\u73af<\/h2>\n

While\u5faa\u73af：<\/p>\n

<?php<\/p>\n

$i = 1;<\/p>\n

while ($i <= 100) {<\/p>\n

\u00a0\u00a0\u00a0\u00a0if ($i == 80) {<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0break; \/\/ \u523080\u7ec8\u6b62\u5faa\u73af<\/p>\n

\u00a0\u00a0\u00a0\u00a0}<\/p>\n

\u00a0\u00a0\u00a0\u00a0if ($i % 17 == 0) {<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0$i++; \/\/ \u6ce8\u610f：\u8df3\u8fc7\u65f6\u4e5f\u8981\u9012\u589e，\u9632\u6b62\u6b7b\u5faa\u73af<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0continue; \/\/ \u8df3\u8fc717\u7684\u500d\u6570<\/p>\n

\u00a0\u00a0\u00a0\u00a0}<\/p>\n

\u00a0\u00a0\u00a0\u00a0echo $i . " ";<\/p>\n

\u00a0\u00a0\u00a0\u00a0$i++;<\/p>\n

}<\/p>\n

?><\/p>\n

\"\"<\/p>\n

for\u5faa\u73af：<\/p>\n

<?php<\/p>\n

for ($i = 1; $i <= 100; $i++) {<\/p>\n

\u00a0\u00a0\u00a0\u00a0if ($i == 80) {<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0break;<\/p>\n

\u00a0\u00a0\u00a0\u00a0}<\/p>\n

\u00a0\u00a0\u00a0\u00a0if ($i % 17 == 0) {<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0continue;<\/p>\n

\u00a0\u00a0\u00a0\u00a0}<\/p>\n

\u00a0\u00a0\u00a0\u00a0echo $i . " ";<\/p>\n

}<\/p>\n

?><\/p>\n

\"\"<\/p>\n

continue： \u8df3\u8fc7\u5f53\u524d\u5faa\u73af\u7684\u5269\u4f59\u4ee3\u7801，\u8fdb\u5165\u4e0b\u4e00\u6b21\u5faa\u73af\u3002\u6ce8\u610f\u5728while\u5faa\u73af\u4e2d，\u5982\u679ccontinue \u524d\u5fd8\u8bb0\u9012\u589e $i，\u4f1a\u5bfc\u81f4\u6b7b\u5faa\u73af\u3002<\/p>\n

break：\u5b8c\u5168\u7ec8\u6b62\u5e76\u8df3\u51fa\u5f53\u524d\u7684\u5faa\u73af\u7ed3\u6784\u3002<\/p>\n

\u53d6\u6a21\u8fd0\u7b97\u7b26%：\u7528\u4e8e\u5224\u65ad\u662f\u5426\u80fd\u88ab17\u6574\u9664\u3002<\/p>\n

\u5faa\u73af\u63a7\u5236：break\u548ccontinue\u53ef\u4ee5\u7cbe\u7ec6\u63a7\u5236\u5faa\u73af\u7684\u6267\u884c\u6d41\u7a0b\u3002<\/p>\n

while\u4e0efor：while \u66f4\u7075\u6d3b，\u4f46\u9700\u8981\u624b\u52a8\u7ef4\u62a4\u5faa\u73af\u53d8\u91cf；for\u7ed3\u6784\u7d27\u51d1，\u9002\u5408\u77e5\u9053\u5faa\u73af\u6b21\u6570\u7684\u573a\u666f\u3002<\/p>\n<\/p>\n

\u5341\u4e00\u3001\u7d22\u5f15\u6570\u7ec4\u3001\u5173\u8054\u6570\u7ec4\u521b\u5efa\u3001\u589e\u5220\u6539\u67e5<\/h2>\n

<?php<\/p>\n

$class = ["a","b","c"];<\/p>\n

$student = [<\/p>\n

\u00a0\u00a0\u00a0\u00a0"name" => "cxy",<\/p>\n

"age" => 26,<\/p>\n

"score" => 90.9,<\/p>\n

"sex" => true<\/p>\n

];<\/p>\n

$student["score"] = 98.0;<\/p>\n

$student["skill"] = "Web\u6e17\u900f";<\/p>\n

echo "\u53ea\u53d6\u503c：";<\/p>\n

foreach ($student as $value) {<\/p>\n

echo $value . " ";<\/p>\n

}<\/p>\n

echo "<br>";<\/p>\n

echo "\u540c\u65f6\u53d6\u952e\u548c\u503c：";<\/p>\n

foreach ($student as $key => $value){<\/p>\n

echo "[$key] => $value";<\/p>\n

}<\/p>\n

echo "<br>";<\/p>\n

?><\/p>\n

\n

\"\"<\/p>\n

\u7d22\u5f15\u6570\u7ec4：\u952e\u662f\u81ea\u52a8\u9012\u589e\u7684\u6570\u5b57（\u4ece0\u5f00\u59cb）\u3002<\/p>\n

\u5173\u8054\u6570\u7ec4：\u952e\u662f\u81ea\u5b9a\u4e49\u7684\u5b57\u7b26\u4e32\u3002<\/p>\n

\u589e\/\u6539：\u76f4\u63a5\u4f7f\u7528 $array[key] = value \u5373\u53ef，\u5982\u679c\u952e\u4e0d\u5b58\u5728\u5219\u65b0\u589e，\u5b58\u5728\u5219\u4fee\u6539\u3002<\/p>\n

\u5220：\u4f7f\u7528 unset($array[key])\u3002<\/p>\n

foreach：\u662f\u6700\u5e38\u7528\u7684\u904d\u5386\u6570\u7ec4\u65b9\u5f0f\u3002<\/p>\n

foreach ($array as $value) \u53ea\u83b7\u53d6\u503c\u3002<\/p>\n

foreach ($array as $key => $value) \u540c\u65f6\u83b7\u53d6\u952e\u548c\u503c\u3002<\/p>\n

\u6570\u7ec4\u7c7b\u578b：PHP \u7684\u6570\u7ec4\u5b9e\u9645\u4e0a\u662f\u4e00\u4e2a\u6709\u5e8f\u6620\u5c04，\u53ef\u4ee5\u540c\u65f6\u5145\u5f53\u7d22\u5f15\u6570\u7ec4\u548c\u5173\u8054\u6570\u7ec4\u3002<\/p>\n

\u589e\u5220\u6539\u67e5：\u64cd\u4f5c\u975e\u5e38\u7b80\u5355\u76f4\u63a5，\u662fPHP\u7075\u6d3b\u6027\u7684\u4f53\u73b0\u3002<\/p>\n

\u904d\u5386：foreach \u662f\u5904\u7406\u6570\u7ec4\u7684\u9996\u9009\u65b9\u5f0f，\u5b83\u5185\u90e8\u7ef4\u62a4\u4e86\u6307\u9488，\u4e0d\u9700\u8981\u624b\u52a8\u63a7\u5236\u3002<\/p>\n

\u5341\u4e8c\u3001\u603b\u7ed3<\/h2>\n

\n

PHP \u6807\u8bb0\u4e0e\u4fe1\u606f\u6cc4\u9732：PHP \u6807\u8bb0\u5916\u7684\u5185\u5bb9\u4f1a\u76f4\u63a5\u8f93\u51fa\u5230\u6d4f\u89c8\u5668，phpinfo() \u6216\u8f93\u51fa\u9b54\u672f\u5e38\u91cf（__FILE__\u3001__DIR__ \u7b49）\u4f1a\u66b4\u9732\u8def\u5f84\u548c\u914d\u7f6e\u4fe1\u606f，\u5c5e\u4e8e\u654f\u611f\u4fe1\u606f\u6cc4\u9732\u6f0f\u6d1e，\u751f\u4ea7\u73af\u5883\u52a1\u5fc5\u5173\u95ed\u9519\u8bef\u663e\u793a\u5e76\u7981\u7528 phpinfo\u3002<\/p>\n

\u5f31\u7c7b\u578b\u4e0e\u7c7b\u578b\u8f6c\u6362：\u5b57+\u5b57\u7b26\u4e32\u8fd0\u7b97\u3001\u677e\u6563\u6bd4\u8f83（==）\u7b49\u573a\u666f\u4e0b\u7684\u9690\u5f0f\u7c7b\u578b\u8f6c\u6362，\u53ef\u80fd\u5bfc\u81f4\u903b\u8f91\u5224\u65ad\u9519\u8bef\u6216\u7ed5\u8fc7\u8eab\u4efd\u9a8c\u8bc1\u3002\u59cb\u7ec8\u4f7f\u7528\u4e25\u683c\u6bd4\u8f83（===），\u5e76\u907f\u514d\u5728\u5b89\u5168\u654f\u611f\u5904\u4f9d\u8d56\u9690\u5f0f\u8f6c\u6362\u3002<\/p>\n

\u53ef\u53d8\u53d8\u91cf\u4e0e\u53d8\u91cf\u8986\u76d6：\u53ef\u53d8\u53d8\u91cf（$$）\u82e5\u7ed3\u5408\u7528\u6237\u8f93\u5165，\u53ef\u76f4\u63a5\u9020\u6210\u53d8\u91cf\u8986\u76d6\u6f0f\u6d1e，\u653b\u51fb\u8005\u53ef\u7be1\u6539\u7a0b\u5e8f\u72b6\u6001\u3002\u4e25\u7981\u5c06\u7528\u6237\u53ef\u63a7\u6570\u636e\u7528\u4e8e\u52a8\u6001\u53d8\u91cf\u540d\u3002<\/p>\n

\u5e03\u5c14\u771f\u5047\u503c：\u7406\u89e3 PHP \u7684\u5047\u503c\u5217\u8868（false, 0, 0.0, "", "0", [], NULL），\u907f\u514d\u5728\u6761\u4ef6\u5224\u65ad\u4e2d\u56e0\u7c7b\u578b\u8f6c\u6362\u4ea7\u751f\u610f\u5916\u7ed3\u679c\u3002\u5c24\u5176\u6ce8\u610f "0" \u4e3a\u5047\u503c，\u4f46 "0.0" \u4e3a\u771f\u503c\u3002<\/p>\n

\u5b57\u7b26\u4e32\u5b9a\u754c\u4e0e\u6ce8\u5165：\u5b9a\u754c\u7b26（<<<）\u9002\u5408\u8f93\u51fa\u5927\u6bb5 HTML，\u4f46\u9700\u6ce8\u610f\u53d8\u91cf\u6ce8\u5165\u7684\u98ce\u9669\u3002\u8f93\u51fa\u5230\u9875\u9762\u65f6\u5e94\u5bf9\u53d8\u91cf\u8fdb\u884c htmlspecialchars() \u8f6c\u4e49，\u9632\u6b62 XSS\u3002<\/p>\n

\u9b54\u672f\u5e38\u91cf\u4e0e\u9884\u5b9a\u4e49\u5e38\u91cf：__FILE__\u3001PHP_VERSION \u7b49\u53ef\u6cc4\u9732\u670d\u52a1\u5668\u8def\u5f84\u3001PHP \u7248\u672c\u7b49\u4fe1\u606f，\u751f\u4ea7\u73af\u5883\u7981\u6b62\u76f4\u63a5\u8f93\u51fa\u3002\u53ef\u901a\u8fc7\u914d\u7f6e php.ini \u7981\u7528\u76f8\u5173\u8f93\u51fa\u3002<\/p>\n

\u53cd\u5f15\u53f7\u547d\u4ee4\u6ce8\u5165：\u53cd\u5f15\u53f7\u7b49\u540c\u4e8e shell_exec()，\u76f4\u63a5\u6267\u884c\u7cfb\u7edf\u547d\u4ee4，\u82e5\u62fc\u63a5\u7528\u6237\u8f93\u5165\u5c06\u5bfc\u81f4\u547d\u4ee4\u6ce8\u5165，\u662f\u6700\u5371\u9669\u7684\u5b89\u5168\u6f0f\u6d1e\u4e4b\u4e00\u3002\u675c\u7edd\u4f7f\u7528\u53cd\u5f15\u53f7\u6267\u884c\u5916\u90e8\u8f93\u5165，\u9700\u8981\u6267\u884c\u7cfb\u7edf\u547d\u4ee4\u65f6\u5e94\u4f7f\u7528 escapeshellcmd() \u6216\u767d\u540d\u5355\u3002<\/p>\n

\u9519\u8bef\u6291\u5236\u7b26 @：@ \u4f1a\u5c4f\u853d\u9519\u8bef\u4fe1\u606f，\u867d\u7136\u53ef\u4ee5\u9690\u85cf\u8c03\u8bd5\u4fe1\u606f，\u4f46\u4e5f\u4f1a\u63a9\u76d6\u771f\u5b9e\u6f0f\u6d1e，\u5efa\u8bae\u4ec5\u7528\u4e8e\u9884\u671f\u53ef\u63a7\u7684\u9519\u8bef\u573a\u666f，\u751f\u4ea7\u73af\u5883\u5e94\u914d\u5408\u65e5\u5fd7\u8bb0\u5f55\u3002<\/p>\n

switch \u7a7f\u900f\u4e0e\u903b\u8f91\u9519\u8bef：\u5fd8\u8bb0 break \u4f1a\u5bfc\u81f4 case \u7a7f\u900f，\u53ef\u80fd\u9020\u6210\u6743\u9650\u7ed5\u8fc7\u6216\u903b\u8f91\u6f0f\u6d1e，\u6bcf\u4e2a case \u672b\u5c3e\u52a1\u5fc5\u6dfb\u52a0 break，\u9664\u975e\u6709\u610f\u5229\u7528\u7a7f\u900f\u7279\u6027\u3002<\/p>\n

\u5faa\u73af\u63a7\u5236\u4e0e\u6b7b\u5faa\u73af：while \u5faa\u73af\u4e2d continue \u524d\u5fc5\u987b\u9012\u589e\u8ba1\u6570\u5668，\u5426\u5219\u5bfc\u81f4\u6b7b\u5faa\u73af；break \u8981\u53ca\u65f6\u9000\u51fa\u5faa\u73af，\u9632\u6b62\u65e0\u9650\u6267\u884c\u3002<\/p>\n

\u6570\u7ec4\u4e0e\u6570\u636e\u64cd\u4f5c：PHP \u6570\u7ec4\u7075\u6d3b\u5f3a\u5927，\u662f Web \u5f00\u53d1\u5e38\u7528\u6570\u636e\u7ed3\u6784，\u4f46\u8981\u6ce8\u610f\u5728\u5bf9\u6570\u7ec4\u8fdb\u884c\u589e\u5220\u6539\u67e5\u65f6，\u907f\u514d\u56e0\u672a\u9a8c\u8bc1\u6570\u636e\u6765\u6e90\u5bfc\u81f4\u7684\u903b\u8f91\u6f0f\u6d1e（\u5982\u672a\u8fc7\u6ee4\u7684\u952e\u540d\u53ef\u88ab\u5229\u7528）\u3002<\/p>\n

\n","protected":false},"excerpt":{"rendered":"

\u4e00\u3001PHP\u6807\u51c6\u8bed\u8a00\u683c\u5f0fPHP\u8bed\u8a00\u6807\u8bb0：PHP\u7528\u901a\u4fd7\u7684\u8bdd\u6765\u8bb2\u5b83\u662f\u6bd4\u8f83\u968f\u610f\u7684\u4e00\u4e2a\u8bed\u8a00，\u5728PHP\u6587\u4ef6\u4e2d，\u91cc\u9762\u53ef\u4ee5<\/p>\n","protected":false},"author":2,"featured_media":90170,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[230,275,61,190],"topic":[],"class_list":["post-90189","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-server","tag-php","tag-web","tag-61","tag-190"],"yoast_head":"\n\u521d\u8bc6PHP - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wsisp.com\/helps\/90189.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u521d\u8bc6PHP - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"og:description\" content=\"\u4e00\u3001PHP\u6807\u51c6\u8bed\u8a00\u683c\u5f0fPHP\u8bed\u8a00\u6807\u8bb0：PHP\u7528\u901a\u4fd7\u7684\u8bdd\u6765\u8bb2\u5b83\u662f\u6bd4\u8f83\u968f\u610f\u7684\u4e00\u4e2a\u8bed\u8a00，\u5728PHP\u6587\u4ef6\u4e2d，\u91cc\u9762\u53ef\u4ee5\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.wsisp.com\/helps\/90189.html\" \/>\n<meta property=\"og:site_name\" content=\"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"article:published_time\" content=\"2026-08-04T11:49:32+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/08\/20260804114929-6a71d1c972415.png\" \/>\n<meta name=\"author\" content=\"admin\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"admin\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4\" \/>\n\t<meta name=\"twitter:data2\" content=\"5 \u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/90189.html\",\"url\":\"https:\/\/www.wsisp.com\/helps\/90189.html\",\"name\":\"\u521d\u8bc6PHP - 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