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    <form method=post action=act.php>
        ÐÕÃû£º<input type=text name='name'><br>
        ÄêÁ䣺<inupt type=text name='uage' ><br>
        <input type=submit value="Ìá½»">
    </form>
    act.phpÖн«ÊµÏÖ±íµ¥µÄÑéÖ¤£º
    $userinfo = array();                 // ²½Öè1
    $userinfo['name'] = isset($_POST['uname']) ? $_POST['uname'] : '';
    $userinfo['age'] = isset($_POST['uage']) ? (int)$_POST['uage'] : 0;
    $error_message = "";           // ´íÎóÐÅÏ¢
    // ²½Öè2
    $elems = array(
        array("\$userinfo['name']", 'strlen(#)<1', 'ÐÕÃû²»ÄÜΪ¿Õ!'),
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º¯ÊýÔ­ÐÍ£ºint preg_match (string $pattern, string $content [, array
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apache:
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apacheÅäÖÃÎļþ:/etc/httpd/conf/httpd.conf
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php:
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worker_processes
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error_log
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pid
pid
        /var/run/nginx.pid;
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