function grabImage($url, $filename = '') { if($url == '') { return false; //如果 $url 为空则返回 false; } $ext_name = strrchr($url, '.'); //获取图片的扩展名 if($ext_name != '.gif' && $ext_name != '.jpg' && $ext_name != '.bmp' && $ext_name != '.png') { return false; //格式不在允许的范围 } if($filename == '') { $filename = time().$ext_name; //以时间戳另起名 } //开始捕获 ob_start(); readfile($url); $img_data = ob_get_contents(); ob_end_clean(); $size = strlen($img_data); $local_file = fopen($filename , 'a'); fwrite($local_file, $img_data); fclose($local_file); return $filename; }