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这么能做到防注入

WBOYOriginal: 2016-06-13 12:35:59836browse

这样能做到防注入？

<br />
function defend_xss($val){<br />
	return is_array($val) ? $val : htmlspecialchars($val);<br />
}<br />
<br />
function gpc($name,$w = 'GPC',$default = '',$d_xss=1){<br />
	global $curr_script;<br />
	if($curr_script==ADMINCP){<br />
		$d_xss = 0;<br />
	}<br />
	$i = 0;<br />
	for($i = 0; $i < strlen($w); $i++) {<br />
		if($w[$i] == 'G' && isset($_GET[$name])) return $d_xss ? defend_xss($_GET[$name]) : $_GET[$name];<br />
		if($w[$i] == 'P' && isset($_POST[$name])) return $d_xss ? defend_xss($_POST[$name]) : $_POST[$name];<br />
		if($w[$i] == 'C' && isset($_COOKIE[$name])) return $d_xss ? defend_xss($_COOKIE[$name]) : $_COOKIE[$name];<br />
	}<br />
	return $default;<br />
}<br />

<br />
<?php<br />
$test = gpc('test','P','')<br />
$userid = @$db->result_first("select userid from user where username='$test'");<br />
....以下代码省略<br />
?><br />

能做到防注入吗

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