php自定义urlencode，urldecode函数实例

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//配合JavaScript的ajaxObject函数, 对字串进行转码.

function ajax_encode($str){

$patern = array("/%/","/=/","/&/");

// % 必须是第一个项, 替换是按项的顺序进行的.

$rp = array("%25","%26","%3D");

return preg_replace($patern,$rp,$str);

}

//逆函数

function ajax_decode($str){

$patern = array("/%25/","/%26/","/%3D/");

$rp = array("%","=","&");

return preg_replace($patern,$rp,$str);

}