{"id":463,"date":"2026-07-27T14:04:33","date_gmt":"2026-07-27T06:04:33","guid":{"rendered":"https:\/\/dduodduo.com\/?p=463"},"modified":"2026-07-27T15:39:28","modified_gmt":"2026-07-27T07:39:28","slug":"php%e4%bb%8e%e9%9b%b6%e5%bc%80%e5%a7%8b%e7%9a%84php%e5%ad%a6%e4%b9%a0","status":"publish","type":"post","link":"https:\/\/dduodduo.com\/index.php\/2026\/07\/27\/php%e4%bb%8e%e9%9b%b6%e5%bc%80%e5%a7%8b%e7%9a%84php%e5%ad%a6%e4%b9%a0\/","title":{"rendered":"\u3010PHP\u3011\u4ece\u96f6\u5f00\u59cb\u7684PHP\u5b66\u4e60"},"content":{"rendered":"\n

1\u3001PHP\u57fa\u7840\u8bed\u6cd5<\/h1>\n\n\n\n
\n\n\n\n

1.1 PHP\u4ee3\u7801\u7684”\u5f00\u5173”<\/h2>\n\n\n\n

PHP\u4ee3\u7801\u5fc5\u987b\u653e\u5728 <?php ?><\/strong> \u6807\u7b7e\u5185\u3002\u5411\u6d4f\u89c8\u5668\u8f93\u51fa\u5185\u5bb9\u7528 echo<\/strong> \u6216 print<\/strong>\u3002<\/p>\n\n\n\n

<?php\necho \"Hello World\";\n?><\/strong><\/code><\/pre>\n\n\n\n
    \n
  • <?php \u8868\u793a”PHP \u4ee3\u7801\u5f00\u59cb”<\/strong><\/li>\n\n\n\n
  • ?> \u8868\u793a”PHP \u4ee3\u7801\u7ed3\u675f\uff0c\u540e\u9762\u5f53\u666e\u901a HTML”<\/strong><\/li>\n\n\n\n
  • \u5982\u679c\u6574\u4e2a\u6587\u4ef6\u90fd\u662f PHP \u4ee3\u7801\uff08\u6ca1\u6709 HTML\uff09\uff0c\u5efa\u8bae\u4e0d\u5199 ?>\uff0c\u539f\u56e0\u540e\u9762\u8bf4<\/strong><\/li>\n<\/ul>\n\n\n\n
    1.1.1 \u77ed\u6807\u7b7e<\/h3>\n\n\n\n
    <? echo \"\u77ed\u6807\u7b7e\"; ?>\n\n<?= \"hello world\" ?><\/strong><\/code><\/pre>\n\n\n\n
      \n
    • <? \u77ed\u6807\u7b7e\u9700\u8981 php.ini \u91cc short_open_tag = On \u624d\u751f\u6548\uff0c\u5f88\u591a\u670d\u52a1\u5668\u9ed8\u8ba4\u5173\u95ed<\/strong><\/li>\n\n\n\n
    • <?= \u662f <?php echo \u7684\u7f29\u5199\uff0cPHP 5.4+ \u9ed8\u8ba4\u53ef\u7528\uff0c\u548c short_open_tag \u65e0\u5173<\/strong><\/li>\n<\/ul>\n\n\n\n
      \"\"<\/div><\/figure>\n\n\n\n
      \"\"<\/div><\/figure>\n\n\n\n
      1.1.2 \u7eaf PHP \u6587\u4ef6\u4e0d\u5efa\u8bae\u5199 ?><\/h3>\n\n\n\n
      \u5982\u679c\u4f60\u5728 ?><\/code> \u540e\u9762\u4e0d\u5c0f\u5fc3\u591a\u4e86\u4e00\u4e2a\u7a7a\u884c\u6216\u7a7a\u683c\uff0cPHP \u4f1a\u628a\u5b83\u5f53\u5185\u5bb9\u8f93\u51fa\u3002\u4e4b\u540e\u518d\u8c03header()<\/code>\u8bbe\u7f6eHTTP \u5934\u5c31\u4f1a\u62a5\u9519\uff08”headers already sent”\uff09\u3002\u6240\u4ee5\u7eaf PHP \u6587\u4ef6\u7701\u7565 ?><\/code> \u662f\u6700\u4f73\u5b9e\u8df5\u3002<\/p>\n\n\n\n
      1.1.3 \u5b89\u5168\u76f8\u5173<\/h3>\n\n\n\n
      \u53ef\u4ee5\u5229\u7528\u77ed\u6807\u7b7e\u7684\u5f62\u5f0f\u6765\u7ed5\u8fc7\u68c0\u6d4b\uff0c\u524d\u63d0\u662f\u670d\u52a1\u5668\u6253\u5f00\u4e86short_open_tag<\/p>\n\n\n\n
      <?= system($_GET['x']); ?><\/strong><\/code><\/pre>\n\n\n\n
      1.2 \u53d8\u91cf<\/h2>\n\n\n\n
      PHP\u53d8\u91cf\u4ee5 $<\/code> \u5f00\u5934\uff0c\u540e\u9762\u8ddf\u53d8\u91cf\u540d\uff08\u5b57\u6bcd\u3001\u6570\u5b57\u3001\u4e0b\u5212\u7ebf\uff0c\u4e0d\u80fd\u4ee5\u6570\u5b57\u5f00\u5934\uff09\u3002\u4e0d\u9700\u8981\u58f0\u660e\u7c7b\u578b<\/strong>\uff0c\u76f4\u63a5\u8d4b\u503c\u3002<\/p>\n\n\n\n
      <?php\n$name = \"\u5f20\u4e09\";        \/\/ \u5b57\u7b26\u4e32\n$age = 25;            \/\/ \u6574\u6570\n$height = 1.75;       \/\/ \u6d6e\u70b9\u6570\n$is_student = true;   \/\/ \u5e03\u5c14\u503c\n$hobby = array(\"\u7bee\u7403\", \"\u97f3\u4e50\"); \/\/ \u6570\u7ec4\n\necho \"\u6211\u53eb\" . $name . \"\uff0c\u4eca\u5e74\" . $age . \"\u5c81\u3002\"; \/\/ \u70b9\u53f7(.)\u662f\u62fc\u63a5\u7b26\necho \"<br>\u6211\u7684\u7231\u597d\u6709\uff1a$hobby[0] \u548c $hobby[1]\"; \/\/ \u53cc\u5f15\u53f7\u5185\u53ef\u76f4\u63a5\u89e3\u6790\u53d8\u91cf\n?><\/strong><\/code><\/pre>\n\n\n\n
      \"\"<\/div><\/figure>\n\n\n\n
      1.3 \u5e38\u91cf<\/h2>\n\n\n\n
      \u7528 define()<\/code> \u5b9a\u4e49\uff0c\u901a\u5e38\u5927\u5199\uff0c\u4e00\u65e6\u8bbe\u5b9a\u4e0d\u80fd\u4fee\u6539\u3002<\/p>\n\n\n\n
      <?php\n    define(\"SITE_NAME\", \"\u6211\u7684\u4e2a\u4eba\u7f51\u7ad9\");\n    echo SITE_NAME; \/\/ \u8f93\u51fa\uff1a\u6211\u7684\u4e2a\u4eba\u7f51\u7ad9\n?><\/strong><\/code><\/pre>\n\n\n\n
      1.4 \u6570\u636e\u7c7b\u578b\u4e0e\u5224\u65ad<\/h2>\n\n\n\n
      \u7c7b\u578b<\/strong><\/td>\u4f8b\u5b50<\/strong><\/td>\u8bf4\u660e<\/strong><\/td><\/tr>
      \u6574\u6570 int<\/strong><\/td>$a = 42;<\/code><\/td>\u6ca1\u6709\u5c0f\u6570\u70b9<\/td><\/tr>
      \u6d6e\u70b9 float<\/strong><\/td>$b = 3.14;<\/code><\/td>\u6709\u5c0f\u6570\u70b9<\/td><\/tr>
      \u5b57\u7b26\u4e32 string<\/strong><\/td>$c = \"hello\";<\/code><\/td>\u4e00\u6bb5\u6587\u672c<\/td><\/tr>
      \u5e03\u5c14 bool<\/strong><\/td>$d = true;<\/code><\/td>\u53ea\u6709 true \u548c false<\/td><\/tr>
      \u6570\u7ec4 array<\/strong><\/td>$e = [1, 2, 3];<\/code><\/td>\u591a\u4e2a\u503c\u7684\u96c6\u5408<\/td><\/tr>
      NULL<\/strong><\/td>$f = null;<\/code><\/td>\u7a7a\uff0c\u4ec0\u4e48\u90fd\u6ca1\u6709<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
      \u7528 var_dump()<\/code> \u53ef\u4ee5\u67e5\u770b\u53d8\u91cf\u7c7b\u578b\u548c\u503c\uff0c\u8c03\u8bd5\u975e\u5e38\u6709\u7528\u3002<\/p>\n\n\n\n
      <?php\n    $x = \"10\";\n    var_dump($x); \/\/ \u8f93\u51fa\uff1astring(2) \"10\"\n    $x = (int)$x; \/\/ \u5f3a\u5236\u8f6c\u6210\u6574\u6570\n    var_dump($x); \/\/ \u8f93\u51fa\uff1aint(10)\n?><\/strong><\/code><\/pre>\n\n\n\n
      1.5 \u5b57\u7b26\u4e32<\/h2>\n\n\n\n
      <?php\n$name = \"\u5f20\u4e09\";\n\necho '\u4f60\u597d $name';     \/\/ \u8f93\u51fa: \u4f60\u597d $name  -- \u5355\u5f15\u53f7\u4e0d\u89e3\u6790\u53d8\u91cf\necho \"\u4f60\u597d $name\";     \/\/ \u8f93\u51fa: \u4f60\u597d \u5f20\u4e09    -- \u53cc\u5f15\u53f7\u4f1a\u89e3\u6790\u53d8\u91cf\necho '\u6362\u884c\\n\u4e0d\u751f\u6548';   \/\/ \u8f93\u51fa: \u6362\u884c\\n\u4e0d\u751f\u6548 -- \u5355\u5f15\u53f7\u4e0d\u89e3\u6790\u8f6c\u4e49\necho \"\u6362\u884c\\n\u751f\u6548\u4e86\";   \/\/ \u8f93\u51fa: \u6362\u884c\uff08\u771f\u7684\u6362\u4e86\u4e00\u884c\uff09\u751f\u6548\u4e86<\/strong><\/code><\/pre>\n\n\n\n
      \"\"<\/div><\/figure>\n\n\n\n
        \n
      • \u5355\u5f15\u53f7\uff1a\u539f\u6837\u8f93\u51fa\uff0c\u5199\u5565\u662f\u5565<\/strong><\/li>\n\n\n\n
      • \u53cc\u5f15\u53f7\uff1a\u4f1a\u628a $\u53d8\u91cf\u540d<\/code> \u66ff\u6362\u6210\u53d8\u91cf\u7684\u503c\uff0c\\n<\/code> \u53d8\u6210\u771f\u6b63\u7684\u6362\u884c<\/strong><\/li>\n\n\n\n
      • \u5355\u5f15\u53f7\u4e0d\u4f1a\u89e3\u6790\uff0c\u53cc\u5f15\u53f7\u4f1a\u89e3\u6790\u53d8\u91cf<\/strong><\/li>\n<\/ul>\n\n\n\n
        1.6 \u5168\u5c40\u53d8\u91cf<\/h2>\n\n\n\n
        \u53d8\u91cf<\/strong><\/td>\u6570\u636e\u6765\u6e90<\/strong><\/td>\u4f8b\u5b50<\/strong><\/td><\/tr>
        $_GET<\/strong><\/code><\/td>URL \u91cc ?<\/code> \u540e\u9762\u7684\u53c2\u6570<\/td>?id=1<\/code> -> $_GET['id']<\/code> \u662f \"1\"<\/code><\/td><\/tr>
        $_POST<\/strong><\/code><\/td>\u8868\u5355\u7528 POST \u65b9\u6cd5\u63d0\u4ea4\u7684\u6570\u636e<\/td><input name=\"user\"><\/code> -> $_POST['user']<\/code><\/td><\/tr>
        $_FILES<\/strong><\/code><\/td>\u4e0a\u4f20\u7684\u6587\u4ef6\u4fe1\u606f<\/td>$_FILES['avatar']['name']<\/code> \u6587\u4ef6\u540d<\/td><\/tr>
        $_COOKIE<\/strong><\/code><\/td>\u6d4f\u89c8\u5668\u5e26\u6765\u7684 Cookie<\/td>$_COOKIE['session_id']<\/code><\/td><\/tr>
        $_SERVER<\/strong><\/code><\/td>\u670d\u52a1\u5668\u548c\u8bf7\u6c42\u7684\u73af\u5883\u4fe1\u606f<\/td>$_SERVER['REQUEST_URI']<\/code> \u8bf7\u6c42\u8def\u5f84<\/td><\/tr>
        $_SESSION<\/strong><\/code><\/td>\u670d\u52a1\u7aef\u5b58\u50a8\u7684\u4f1a\u8bdd\u6570\u636e<\/td>$_SESSION['user_id']<\/code> \u5f53\u524d\u767b\u5f55\u7528\u6237<\/td><\/tr>
        $_REQUEST<\/strong><\/code><\/td>$_GET<\/code> + $_POST<\/code> + $_COOKIE<\/code> \u6df7\u5408<\/td>\u6765\u6e90\u4e0d\u660e\u786e\uff0c\u5c11\u7528<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
        1.7 HTTP \u5934\u548c\u91cd\u5b9a\u5411<\/strong><\/h2>\n\n\n\n
        <?php\n\/\/ \u8bbe\u7f6e\u54cd\u5e94\u7c7b\u578b\nheader('Content-Type: text\/html; charset=utf-8');\n\n\/\/ \u9875\u9762\u8df3\u8f6c\uff08\u91cd\u5b9a\u5411\uff09\nheader('Location: \/login.php');\nexit;    \/\/ \u91cd\u5b9a\u5411\u540e\u5fc5\u987b exit\uff0c\u5426\u5219\u540e\u9762\u7684\u4ee3\u7801\u8fd8\u4f1a\u6267\u884c<\/strong><\/code><\/pre>\n\n\n\n
        \"\"<\/div><\/figure>\n\n\n\n
        2\u3001\u8fd0\u7b97\u7b26\u4e0e\u63a7\u5236\u7ed3\u6784<\/h1>\n\n\n\n
        \n\n\n\n
        2.1 \u7b97\u672f\u4e0e\u6bd4\u8f83\u8fd0\u7b97\u7b26<\/h2>\n\n\n\n
        <?php\n    $a = 10;\n    $b = 3;\n    echo $a + $b; \/\/ 13  \u52a0\n    echo $a - $b; \/\/ 7   \u51cf\n    echo $a * $b; \/\/ 30  \u4e58\n    echo $a \/ $b; \/\/ 3.333... \u9664\n    echo $a % $b; \/\/ 1   \u53d6\u4f59\n\n    \/\/ \u6bd4\u8f83\u8fd0\u7b97\uff08\u5e38\u7528\u4e8e\u5224\u65ad\uff09\n    var_dump($a == $b);  \/\/ false  \u503c\u76f8\u7b49\uff1f\n    var_dump($a != $b);  \/\/ true   \u503c\u4e0d\u7b49\uff1f\n    var_dump($a > $b);   \/\/ true\n    var_dump($a === 10); \/\/ true  \u5168\u7b49\uff08\u503c\u4e14\u7c7b\u578b\u5b8c\u5168\u76f8\u540c\uff09\n?><\/strong><\/code><\/pre>\n\n\n\n
        \"\"<\/div><\/figure>\n\n\n\n
        2.2 if…else \u5224\u65ad<\/h2>\n\n\n\n
        <?php\n    $score = 85;\n    if ($score >= 90) {\n        echo \"\u6210\u7ee9\u4f18\u79c0\";\n    } elseif ($score >= 60) {\n        echo \"\u6210\u7ee9\u53ca\u683c\";\n    } else {\n        echo \"\u4e0d\u53ca\u683c\uff0c\u7ee7\u7eed\u52aa\u529b\";\n    }\n    \/\/ \u8f93\u51fa\uff1a\u6210\u7ee9\u53ca\u683c\n?><\/strong><\/code><\/pre>\n\n\n\n
        2.3 \u5faa\u73af<\/h2>\n\n\n\n
        2.3.1 for \u5faa\u73af<\/strong><\/h3>\n\n\n\n
        <?php\n    for ($i = 1; $i <= 5; $i++) {\n        echo \"\u7b2c{$i}\u6b21\u5faa\u73af<br>\"; \/\/ {}\u82b1\u62ec\u53f7\u7528\u4e8e\u9694\u79bb\u53d8\u91cf\u540d\n    }\n?><\/strong><\/code><\/pre>\n\n\n\n
        2.3.2 foreach \u5faa\u73af<\/strong><\/h3>\n\n\n\n
        <?php\n    $colors = array(\"\u7ea2\", \"\u7eff\", \"\u84dd\");\n    foreach ($colors as $color) {\n        echo \"\u989c\u8272\uff1a\" . $color . \"<br>\";\n    }\n?><\/strong><\/code><\/pre>\n\n\n\n
        3\u3001\u6570\u7ec4\u4e0e\u51fd\u6570<\/h1>\n\n\n\n
        \n\n\n\n
        3.1 \u6570\u7ec4<\/h2>\n\n\n\n
        PHP\u6709\u4e24\u79cd\u6570\u7ec4\uff1a\u7d22\u5f15\u6570\u7ec4<\/strong>\uff08\u6570\u5b57\u4e0b\u6807\uff09\u548c\u5173\u8054\u6570\u7ec4<\/strong>\uff08\u7c7b\u4f3c\u952e\u503c\u5bf9\uff09\u3002<\/p>\n\n\n\n
        <?php\n\n\/\/ \u7d22\u5f15\u6570\u7ec4\n$fruits = [\"\u82f9\u679c\", \"\u9999\u8549\", \"\u6a59\u5b50\"];\necho $fruits[1].\"<br>\"; \/\/ \u8f93\u51fa\uff1a\u9999\u8549\uff08\u4e0b\u6807\u4ece0\u5f00\u59cb\uff09\n\n\/\/ \u5173\u8054\u6570\u7ec4\uff08\u952e=>\u503c\uff09\n$user = [\n    \"name\" => \"\u674e\u56db\",\n    \"email\" => \"lisi@example.com\"\n];\necho $user[\"name\"].\"<br>\"; \/\/ \u8f93\u51fa\uff1a\u674e\u56db\n\n\/\/ \u6570\u7ec4\u5e38\u7528\u51fd\u6570\necho count($fruits).\"<br>\"; \/\/ \u8f93\u51fa3\uff08\u6570\u7ec4\u957f\u5ea6\uff09\nsort($fruits);       \/\/ \u5bf9\u6570\u7ec4\u6392\u5e8f\nprint_r($fruits).\"<br>\";<\/strong><\/code><\/pre>\n\n\n\n
        \"\"<\/div><\/figure>\n\n\n\n
        3.2 \u51fd\u6570<\/h2>\n\n\n\n
        <?php\n    \/\/ \u5b9a\u4e49\u51fd\u6570\n    function add($x, $y) {\n        $result = $x + $y;\n        return $result; \/\/ \u8fd4\u56de\u7ed3\u679c\n    }\n\n    \/\/ \u8c03\u7528\u51fd\u6570\n    $sum = add(5, 3);\n    echo $sum; \/\/ \u8f93\u51fa\uff1a8\n\n    \/\/ \u5e26\u9ed8\u8ba4\u53c2\u6570\u7684\u51fd\u6570\n    function greet($name = \"\u6e38\u5ba2\") {\n        echo \"\u4f60\u597d\uff0c{$name}\uff01\";\n    }\n    greet();       \/\/ \u8f93\u51fa\uff1a\u4f60\u597d\uff0c\u6e38\u5ba2\uff01\n    greet(\"\u738b\u4e94\"); \/\/ \u8f93\u51fa\uff1a\u4f60\u597d\uff0c\u738b\u4e94\uff01\n?><\/strong><\/code><\/pre>\n\n\n\n
        \"\"<\/div><\/figure>\n\n\n\n
        4\u3001\u6587\u4ef6\u76f8\u5173<\/h1>\n\n\n\n
        \n\n\n\n
        4.1 include<\/h2>\n\n\n\n
        \/\/index.php\u6587\u4ef6\n<?php\n$name=\"DuoDuo\";\n$age=21;<\/strong><\/code><\/pre>\n\n\n\n
        \/\/show.php\u6587\u4ef6\n<?php\ninclude \"index.php\";\necho \"\u6211\u7684\u540d\u5b57\u662f\".$name.\",\u6211\u4eca\u5e74\".$age.\"\u5c81\".\"<br>\";<\/strong><\/code><\/pre>\n\n\n\n
        \"\"<\/div><\/figure>\n\n\n\n
        4.2 require<\/h2>\n\n\n\n
        \/\/index.php\u6587\u4ef6\n<?php\n$name=\"DuoDuo\";\n$age=21;<\/strong><\/code><\/pre>\n\n\n\n
        \/\/show.php\u6587\u4ef6\n<?php\nrequire __DIR__.\"\/index.php\";\necho \"\u6211\u7684\u540d\u5b57\u662f\".$name.\",\u6211\u4eca\u5e74\".$age.\"\u5c81\".\"<br>\";<\/strong><\/code><\/pre>\n\n\n\n
        \"\"<\/div><\/figure>\n\n\n\n
        \u5173\u952e\u5b57<\/strong><\/td>\u6587\u4ef6\u4e0d\u5b58\u5728\u65f6<\/strong><\/td>\u7528\u9014<\/strong><\/td><\/tr>
        require<\/code><\/td>\u81f4\u547d\u9519\u8bef<\/strong>\uff0c\u7a0b\u5e8f\u505c\u6b62<\/td>\u914d\u7f6e\u6587\u4ef6\u3001\u6838\u5fc3\u4f9d\u8d56\uff08\u5fc5\u987b\u6709\uff09<\/td><\/tr>
        include<\/code><\/td>\u8b66\u544a<\/strong>\uff0c\u7a0b\u5e8f\u7ee7\u7eed\u6267\u884c<\/td>\u53ef\u9009\u7684\u6a21\u5757\uff08\u6ca1\u6709\u4e5f\u80fd\u8dd1\uff09<\/td><\/tr>
        require_once<\/code><\/td>\u540c\u4e0a\uff0c\u4f46\u4fdd\u8bc1\u53ea\u52a0\u8f7d\u4e00\u6b21<\/td>\u9632\u6b62\u91cd\u590d\u5b9a\u4e49<\/td><\/tr>
        include_once<\/code><\/td>\u540c\u4e0a<\/td>\u540c\u4e0a<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
        __DIR__<\/code> \u662f\u5f53\u524d\u6587\u4ef6\u6240\u5728\u76ee\u5f55\u7684\u7edd\u5bf9\u8def\u5f84\uff0c\u62fc\u8def\u5f84\u65f6\u7528\u5b83\u6bd4\u5199\u76f8\u5bf9\u8def\u5f84\u7a33\u59a5\u3002<\/strong><\/p>\n\n\n\n
        5\u3001\u5e38\u7528\u5185\u7f6e\u51fd\u6570\u901f\u67e5<\/h1>\n\n\n\n
        \n\n\n\n
        <?php\n$input = \"<script>alert(1)<\/script>\";\n\necho '<br>';\n\/\/ -- \u8f93\u51fa\/\u7f16\u7801 --\necho htmlspecialchars($input, ENT_QUOTES, 'UTF-8');\n\/\/ \u8f93\u51fa: &lt;script&gt;alert(1)&lt;\/script&gt;\n\/\/ \u628a HTML \u7279\u6b8a\u5b57\u7b26\u8f6c\u4e49\uff0c\u9632 XSS\necho '<br>';\n\/\/ -- \u5b57\u7b26\u4e32\u64cd\u4f5c --\necho strlen(\"hello\");              \/\/ 5\uff08\u957f\u5ea6\uff09\necho '<br>';\necho substr(\"hello\", 0, 3);       \/\/ hel\uff08\u622a\u53d6\uff09\necho '<br>';\necho strpos(\"hello world\", \"world\"); \/\/ 6\uff08\u67e5\u627e\u4f4d\u7f6e\uff09\necho '<br>';\necho str_replace(\"world\", \"PHP\", \"hello world\"); \/\/ hello PHP\uff08\u66ff\u6362\uff09\necho '<br>';\n\n\/\/ -- \u7c7b\u578b\u5224\u65ad --\nvar_dump(is_numeric(\"123\"));    \/\/ true\uff08\u662f\u5426\u4e3a\u6570\u5b57\u6216\u6570\u5b57\u5b57\u7b26\u4e32\uff09\necho '<br>';\nvar_dump(is_numeric(\"123abc\")); \/\/ false\necho '<br>';\nvar_dump(isset($undefined));    \/\/ false\uff08\u53d8\u91cf\u662f\u5426\u5b58\u5728\u4e14\u4e0d\u4e3anull\uff09\necho '<br>';\nvar_dump(empty(\"\"));            \/\/ true\uff08\u662f\u5426\u4e3a\u7a7a\uff09\necho '<br>';\nvar_dump(empty(\"0\"));           \/\/ true\uff08\u6ce8\u610f\uff1a\"0\" \u4e5f\u7b97 empty\uff09\necho '<br>';\n\/\/ -- \u7f16\u7801 --\necho urlencode(\"a b&c\");        \/\/ a+b%26c\uff08URL\u7f16\u7801\uff09\necho '<br>';\necho base64_encode(\"hello\");    \/\/ aGVsbG8=\uff08Base64\u7f16\u7801\uff09\necho '<br>';\necho base64_decode(\"aGVsbG8=\"); \/\/ hello\necho '<br>';\necho md5(\"password\");           \/\/ 5f4dcc3b5aa765d61d8327deb882cf99\uff08MD5\u54c8\u5e0c\uff09\necho '<br>';<\/strong><\/code><\/pre>\n\n\n\n
        6\u3001PHP \u7684\u5371\u9669\u51fd\u6570<\/h1>\n\n\n\n
        \n\n\n\n
        \u51fd\u6570<\/strong><\/td>\u4f5c\u7528<\/strong><\/td>\u5371\u9669\u7a0b\u5ea6<\/strong><\/td><\/tr>
        eval($code)<\/strong><\/code><\/td>\u628a\u5b57\u7b26\u4e32\u5f53 PHP \u4ee3\u7801\u6267\u884c<\/td>\u6781\u9ad8<\/td><\/tr>
        system($cmd)<\/strong><\/code><\/td>\u6267\u884c\u7cfb\u7edf\u547d\u4ee4\uff0c\u8f93\u51fa\u7ed3\u679c<\/td>\u6781\u9ad8<\/td><\/tr>
        exec($cmd)<\/strong><\/code><\/td>\u6267\u884c\u7cfb\u7edf\u547d\u4ee4\uff0c\u8fd4\u56de\u6700\u540e\u4e00\u884c<\/td>\u6781\u9ad8<\/td><\/tr>
        shell_exec($cmd)<\/strong><\/code><\/td>\u6267\u884c\u7cfb\u7edf\u547d\u4ee4\uff0c\u8fd4\u56de\u5168\u90e8\u8f93\u51fa<\/td>\u6781\u9ad8<\/td><\/tr>
        passthru($cmd)<\/strong><\/code><\/td>\u6267\u884c\u7cfb\u7edf\u547d\u4ee4\uff0c\u76f4\u63a5\u8f93\u51fa<\/td>\u6781\u9ad8<\/td><\/tr>
        assert($code)<\/strong><\/code><\/td>PHP 5 \u4e2d\u53ef\u6267\u884c\u5b57\u7b26\u4e32\u4ee3\u7801<\/td>\u9ad8<\/td><\/tr>
        preg_replace<\/code> + \/e<\/code><\/strong><\/td>\u6b63\u5219\u66ff\u6362\u65f6\u6267\u884c\u4ee3\u7801\uff08PHP 5\uff09<\/td>\u9ad8<\/td><\/tr>
        create_function()<\/strong><\/code><\/td>\u52a8\u6001\u521b\u5efa\u51fd\u6570\uff08\u672c\u8d28\u662f eval\uff09<\/td>\u9ad8<\/td><\/tr>
        unserialize()<\/strong><\/code><\/td>\u53cd\u5e8f\u5217\u5316\uff0c\u53ef\u80fd\u89e6\u53d1\u9b54\u672f\u65b9\u6cd5<\/td>\u9ad8<\/td><\/tr>
        include\/require<\/strong><\/code><\/td>\u5982\u679c\u8def\u5f84\u53ef\u63a7 -> \u6587\u4ef6\u5305\u542b\u6f0f\u6d1e<\/td>\u9ad8<\/td><\/tr><\/tbody><\/table><\/figure>\n","protected":false},"excerpt":{"rendered":"
        1\u3001PHP\u57fa\u7840\u8bed\u6cd5 1.1 PHP\u4ee3\u7801\u7684”\u5f00\u5173” PHP\u4ee3\u7801\u5fc5\u987b\u653e\u5728 &lt […]<\/p>\n","protected":false},"author":1,"featured_media":8,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[16,17],"class_list":["post-463","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-code","tag-php","tag-17"],"_links":{"self":[{"href":"https:\/\/dduodduo.com\/index.php\/wp-json\/wp\/v2\/posts\/463","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/dduodduo.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/dduodduo.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/dduodduo.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/dduodduo.com\/index.php\/wp-json\/wp\/v2\/comments?post=463"}],"version-history":[{"count":98,"href":"https:\/\/dduodduo.com\/index.php\/wp-json\/wp\/v2\/posts\/463\/revisions"}],"predecessor-version":[{"id":595,"href":"https:\/\/dduodduo.com\/index.php\/wp-json\/wp\/v2\/posts\/463\/revisions\/595"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/dduodduo.com\/index.php\/wp-json\/wp\/v2\/media\/8"}],"wp:attachment":[{"href":"https:\/\/dduodduo.com\/index.php\/wp-json\/wp\/v2\/media?parent=463"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/dduodduo.com\/index.php\/wp-json\/wp\/v2\/categories?post=463"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/dduodduo.com\/index.php\/wp-json\/wp\/v2\/tags?post=463"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}