How to grab remote images and save them locally with PHP

This article mainly shares with you how PHP can capture remote pictures and save them locally. Recently, I need to develop a user material function at work, which needs to locally store various picture materials on the Internet. So I found some relevant information on the Internet, and sorted out the main logic code according to my own development needs.

/**
 * 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) );

The above code has been tested in my work and can basically be used. If there are any questions, please correct me!

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