How to get the implementation class of the specified content in the page in php

This article will show you how to use php to get the specified content in the page, and encapsulate it into a class. Friends who need it can refer to this article

Function:

1. Get the content in the content url, email, image.

2. Replace the url, email, and image in the content.

url：xxx
email：admin@admin.com
image：

Grep.class.php

<?php 
/** grep class 
* Date: 2013-06-15 
* Author: fdipzone 
* Ver: 1.0 
* 
* Func: 
* 
* set: 设置内容 
* get: 返回指定的内容 
* replace: 返回替换后的内容 
* get_pattern 根据type返回pattern 
*/ 

class Grep{ // class start 

private $_pattern = array( 
&#39;url&#39; => '/<a.*?href="((http(s)?:\/\/).*?)".*?/si&#39;, 
&#39;email&#39; => '/([\w\-\.]+@[\w\-\.]+(\.\w+))/', 
'image' => '/<img.*?src=\"(http:\/\/.+\.(jpg|jpeg|gif|bmp|png))\">/i' 
); 

private $_content = ''; // 源内容 

/* 設置搜尋的內容 
* @param String $content 
*/ 
public function set($content=''){ 
$this->_content = $content; 
} 

/* 获取指定内容 
* @param String $type 
* @param int $unique 0:all 1:unique 
* @return Array 
*/ 
public function get($type='', $unique=0){ 

$type = strtolower($type); 

if($this->_content=='' || !in_array($type, array_keys($this->_pattern))){ 
return array(); 
} 

$pattern = $this->get_pattern($type); // 获取pattern 

preg_match_all($pattern, $this->_content, $matches); 

return isset($matches[1])? ( $unique==0? $matches[1] : array_unique($matches[1]) ) : array(); 

} 

/* 获取替换后的内容 
* @param String $type 
* @param String $callback 
* @return String 
*/ 
public function replace($type='', $callback=''){ 

$type = strtolower($type); 

if($this->_content=='' || !in_array($type, array_keys($this->_pattern)) || $callback==''){ 
return $this->_content; 
} 

$pattern = $this->get_pattern($type); 

return preg_replace_callback($pattern, $callback, $this->_content); 

} 

/* 根据type获取pattern 
* @param String $type 
* @return String 
*/ 
private function get_pattern($type){ 
return $this->_pattern[$type]; 
} 
} // class end 

?>

<?php 
header(&#39;content-type:text/htm;charset=utf8&#39;); 

require(&#39;Grep.class.php&#39;); 

$content = file_get_contents(&#39;http://www.test.com/&#39;); 

$obj = new Grep(); 
$obj->set($content); 

$url = $obj->get('url', 0); 
$email = $obj->get('email', 1); 
$image = $obj->get('image', 1); 

print_r($url); 
print_r($email); 
print_r($image); 

$url_new = $obj->replace('url', 'replace_url'); 
echo $url_new; 

function replace_url($matches){ 
return isset($matches[1])? '[url]'.$matches[1].'[/url]' : ''; 
} 
?>

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