How to grab remote images in php and save them locally

Implementation idea:

First determine whether the image path is empty, if not, proceed further, then obtain the image information size, image path suffix name, and then calculate The size of the image source code is 1k written each time until all the data is obtained.

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Sample demonstration:

/**
 * PHP将网页上的图片攫取到本地存储
 * @param $imgUrl  图片url地址
 * @param string $saveDir 本地存储路径 默认存储在当前路径
 * @param null $fileName 图片存储到本地的文件名
 * @return mix
 */
function crabImage($imgUrl, $saveDir='./', $fileName=null){
	if(empty($imgUrl)){
		return false;
	}
	//获取图片信息大小
	$imgSize = getImageSize($imgUrl);
	if(!in_array($imgSize['mime'],array('image/jpg', 'image/gif', 'image/png', 'image/jpeg'),true)){
		return false;
	}
	//获取后缀名
	$_mime = explode('/', $imgSize['mime']);
	$_ext = '.'.end($_mime);
	if(empty($fileName)){  //生成唯一的文件名
		$fileName = uniqid(time(),true).$_ext;
	}
	//开始攫取
	ob_start();
	readfile($imgUrl);
	$imgInfo = ob_get_contents();
	ob_end_clean();
	if(!file_exists($saveDir)){
		mkdir($saveDir,0777,true);
	}
	$fp = fopen($saveDir.$fileName, 'a');
	$imgLen = strlen($imgInfo);    //计算图片源码大小
	$_inx = 1024;   //每次写入1k
	$_time = ceil($imgLen/$_inx);
	for($i=0; $i<$_time; $i++){
		fwrite($fp,substr($imgInfo, $i*$_inx, $_inx));
	}
	fclose($fp);
	return array(&#39;file_name&#39;=>$fileName,&#39;save_path&#39;=>$saveDir.$fileName);
}
$url = &#39;https://mmbiz.qlogo.cn/mmbiz/
7WQtTI9h56hgvOH8J0Xp5v97cDNOxf94vq0NdNOhZmb2ZiaJLfwd2U8gNoEvTQXdWlRPOuibkkSebexmR2epE0pQ/0?wx_fmt=gif&#39;;
//$url = &#39;http://www.phpernote.com/images/logo.gif&#39;;
//$url = &#39;http://avatar.csdn.net/5/3/6/1_u014236259.jpg&#39;;
var_dump( crabImage($url) );

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