下面是PHP的加密和解密
<?php

$g_v = get_post_meta($post->ID, 'url', true); 
function abcEncode($m){
    $m = base64_encode($m);
    $m = str_replace("Ax","@jkp",$m);
    $m = str_replace("ak","@bfg",$m);
    $m = str_replace("R","!BeF",$m);
    return $m;
}
function abcDecode($m){
    $m = str_replace("!BeF","R",$m);
    $m = str_replace("@bfg","ak",$m);
    $m = str_replace("@jkp","Ax",$m);
    $m = base64_decode($m);
    return $m;    
}
$link = abcEncode($g_v);

?>

<iframe id="placeholder" src="<?php echo $link; ?>" frameborder="0" width="100%" height="500"></iframe>

放到php文件中，iframe调用的是加密后的文本，而不是原来$g_v的链接，请问少了点什么代码使iframe能够调用原来的链接并起到源码加密？只要源码看上去是乱码就可以了
谢谢