PHP implements downloading remote pictures and saving them locally-PHP Tutorial-php.cn

This article mainly introduces the method of downloading remote images in PHP. The editor thinks it is quite good. Now I will share it with you and give it as a reference. Let’s follow the editor and take a look.

When using PHP to make a simple crawler, we often encounter the need to download remote images, so let’s simply implement this need.

1. Use curl

For example, we have the following two pictures:

$images = [ 'https://dn-laravist.qbox.me/2015-09-22_00-17-06j.png', 'https://dn-laravist.qbox.me/2015-09-23_00-58-03j.png' ];

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In the first step, we can use it directly The simplest code implementation:

function download($url, $path = 'images/') { $ch = curl_init(); curl_setopt($ch, CURLOPT_URL, $url); curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 30); $file = curl_exec($ch); curl_close($ch); $filename = pathinfo($url, PATHINFO_BASENAME); $resource = fopen($path . $filename, 'a'); fwrite($resource, $file); fclose($resource); }

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Then when downloading remote images, you can do this:

foreach ( $images as $url ) { download($url); }

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2. Encapsulate a class

After clarifying the idea, we can encapsulate this basic function into a class:

class Spider { public function downloadImage($url, $path = 'images/') { $ch = curl_init(); curl_setopt($ch, CURLOPT_URL, $url); curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 30); $file = curl_exec($ch); curl_close($ch); $filename = pathinfo($url, PATHINFO_BASENAME); $resource = fopen($path . $filename, 'a'); fwrite($resource, $file); fclose($resource); } }

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Now, we can also optimize it a little like this:

public function downloadImage($url, $path='images/') { $ch = curl_init(); curl_setopt($ch, CURLOPT_URL, $url); curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 30); $file = curl_exec($ch); curl_close($ch); $this->saveAsImage($url, $file, $path); } private function saveAsImage($url, $file, $path) { $filename = pathinfo($url, PATHINFO_BASENAME); $resource = fopen($path . $filename, 'a'); fwrite($resource, $file); fclose($resource); }

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After encapsulating it into a class, we You can call the code like this to download pictures:

$spider = new Spider(); foreach ( $images as $url ) { $spider->downloadImage($url); }

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In this way, basic remote picture downloading is OK.

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