php批量下载图片，网上找的代码，不好使

function project_statistics(){    	echo "11111";    	$url = "http://www.xxx.com:81/upload/image";  		$content=file_get_contents($url);  		$reg="/<img .*?src=\"(.*?)\".*? alt="php批量下载图片，网上找的代码，不好使" >/";  		  		preg_match_all($reg,$content,$matches);  		  		$path = '../download/img';  		if(!file_exists($path)){  		    mkdir($path, 0777);  		}  		function downImage($url,$filename="") {  		    if($url=="") return false;  		  		    if($filename=="") {  		        $ext=strrchr($url,".");  		        if($ext!=".gif" && $ext!=".jpg" && $ext!=".png" && $ext!="jpeg") return false;  		        $filename=date("YmdHis").$ext;  		    }  		  		    ob_start();  		    //make file that output from url goes to buffer  		    readfile($url);  		    //file_get_contents($url);  这个方法不行的！！！只能用readfile  		    $img = ob_get_contents();  		    ob_end_clean();  		  		    $fp=@fopen($filename, "a");//append  		    fwrite($fp,$img);  		      		    fclose($fp);  		  		    return $filename;  		    			  }		for($i = 0;$i < count($matches[1]);$i ++){  		      		    /*explode 		    $url_arr[$i] = explode('/', $matches[1][$i]); 		    $last = count($url_arr[$i])-1; 		    */  		      		    //strrchr     		    $filename = strrchr($matches[1][$i], '/');  		      		    downImage($matches[1][$i],$path.$filename);  		    //downImage($matches[1][$i],$path.'/'.$url_arr[$i][$last]);  		}    }

$url = "https://ss0.bdstatic.com/5a21bjqh_Q23odCf/static/superplus/img/logo_white_ee663702.png";$c = file_get_contents($url);file_put_contents(basename($url), $c, true); echo '<img  src="'.basename($url).'" alt="php批量下载图片，网上找的代码，不好使" >';