php获取原图片

<?php
/*
获取远程图片函数
*/
function GrabImage($url,$filename=""){
//若url为空返回false，无地址
if($url=="") return false;
//若$filename为空
if($filename=="") {
$ext=strrchr($url,"."); //获取"."加后缀
if($ext!=".gif"&&$ext!=".jpg"&&$ext!=".png") return false;
$filename=date("YmdHis").$ext;
}
ob_start();
readfile($url);
$img = ob_get_contents();
ob_end_clean();
$size = strlen($img);
$fp2=@fopen($filename,"a");
fwrite($fp2,$img);
fclose($fp2);
return $filename;
}
$img=GrabImage("http://www.google.com/intl/en_ALL/images/logo.gif","logo.gif");
if($img){
echo '<img src="'.$img.'" mce_src="'.$img.'">';
}else{
echo "false";
}
?>