php面试题中笔试题目的汇总

IP:echo $_SERVER['REMOTE_ADDR'];

getenv('REMOTE_ADDR');

echo gethostbyname('www.meizhi520.com')

echodate('Y-m-d H:i:s', strtotime('-1 days'));

$d = dir(dirname(__file__));
echo "Handle: " . $d->handle . "\n";
echo "Path: " . $d->path . "\n";
while ( false !== ($entry = $d->read ()) ) {
echo $entry . "";
}
$d->close ();

function checkEmail($email)
{
$pregEmail = "/([a-z0-9]*[-_\.]?[a-z0-9]+)*@([a-z0-9]*[-_]?[a-z0-9]+)+[\.][a-z]{2,3}([\.][a-z]{2})?/i";
return preg_match($pregEmail,$email);
}

function GBsubstr($string, $start, $length) {
    if(strlen($string)>$length){
        $str=null;
        $len=$start+$length;
        for($i=$start;$i<$len;$i++){
            if(ord(substr($string,$i,1))>0xa0){
                $str.=substr($string,$i,2);
                $i++;
            }else{
                $str.=substr($string,$i,1);
            }
        }
        return $str.'…';
    }else{
        return $string;
    }
}

window.location.href <script type="text/javascript" src="js/js_function.js"></script>

class test{
    function Get_test($num){
        $num=md5(md5($num)."En");
        return $num;
    }
}

$testnum = "123″; $object = new test(); $encrypt = $object->Get_test($testnum); echo $encrypt;