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HomeBackend DevelopmentPHP TutorialPHP curl使用实例_PHP

概述

本博客的前面两篇文章:curl和libcurl简介以及PHP中使用curl对PHP中curl的使用做了简单介绍,但是PHP中curl的使用却并不简单,尤其是curl的各种配置项,本篇文章会讲解几个PHP的实例,以便大家更好的理解curl。

实例:抓取页面

使用curl抓取页面相对来说比较简单,但是这里有一点需要注意的是,curl默认会将抓取的页面直接输出到浏览器。然而,我们经常遇到的情况是获取抓取的内容,对内容做一定的处理之后再进行操作。因此,这里写出两种不同的情况。

直接输出到浏览器

代码如下:


 $url="www.baidu.com";
 $ch=curl_init();
 curl_setopt($ch,CURLOPT_URL,$url);
 curl_exec($ch);
 curl_close($ch);
?>

运行上面这段代码,我们会直接看到百度首页。

不直接输出到浏览器

如果我们不想让curl抓取的内容直接输出到浏览器,那么就需要设置curl的“CURLOPT_RETURNTRANSFER”为true,这样curl抓取的内容会作为curl_exec()函数的返回值出现。

代码如下:


 $url="www.baidu.com";
 $content='';
 $ch=curl_init();
 curl_setopt($ch,CURLOPT_URL,$url);
 curl_setopt($ch, CURLOPT_RETURNTRANSFER,TRUE);
 /*
  *根据手册来看,好像PHP5.1.3以前的版本还需要配合CURLOPT_BINARYTRANSFER一起使用,
  *但是5.1.3以后的版本中,该配置项已经被废弃了。
  */
 //curl_setopt($ch, CURLOPT_BINARYTRANSFER,TRUE);
 $content=curl_exec($ch);
 var_dump($content);
 curl_close($ch);
?>


运行代码,我们可以看到页面输出了获取的网页源码。
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