php preg_replace函数基础与实例代码_PHP教程-PHP-Tutorial-php.cn

php preg_replace函数基础与实例代码_PHP教程

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php教程 preg_replace函数基础与实例代码
//preg_replace ( mixed $pattern , mixed $replacement , mixed $subject [, int $limit = -1 [, int &$count ]] ) 主题为匹配搜索模式，替换替换
/*
要搜索的模式。它可以是一个字符串或一个字符串数组。

电子修饰符使preg_replace函数（）替代治疗后，适当引用作为参数是php教程代码进行替换。提示：请确保置换构成一个有效的php代码字符串，否则php将抱怨在包含preg_replace函数线（）解析错误。

返回值

preg_replace函数（）返回一个数组，如果这个问题的参数是一个数组或一个字符串，否则。

如果找到匹配，新问题会产生，否则将返回主题不变或null如果发生错误。
*/

//实例一

$string = 'april 15, 2003';
$pattern = '/(w+) (d+), (d+)/i';
$replacement = '${1}1,$3';
echo preg_replace($pattern, $replacement, $string);

//实例二

$string = 'the quick brown fox jumped over the lazy dog.';
$patterns = array();
$patterns[0] = '/quick/';
$patterns[1] = '/brown/';
$patterns[2] = '/fox/';
$replacements = array();
$replacements[2] = 'bear';
$replacements[1] = 'black';
$replacements[0] = 'slow';
echo preg_replace($patterns, $replacements, $string);

//通过ksorting模式和替代，我们应该得到我们想要的。

ksort($patterns);
ksort($replacements);
echo preg_replace($patterns, $replacements, $string);

//更换几个值

$patterns = array ('/(19|20)(d{2})-(d{1,2})-(d{1,2})/',
'/^s*{(w+)}s*=/');
$replace = array ('3/4/12', '$1 =');
echo preg_replace($patterns, $replace, '{startdate} = 1999-5-27');

//过滤所有html 标签

preg_replace("/(]*>)/e",
"'1'.strtoupper('2').'3'",
$html_body);

//过滤所有script代码

$user_agent = "mozilla/4.0 (compatible; msie 5.01; windows nt 5.0)";

$ch = curl_init();    // initialize curl handle
curl_setopt($ch, curlopt_url, $url); // set url to post to
curl_setopt($ch, curlopt_failonerror, 1);              // fail on errors
curl_setopt($ch, curlopt_followlocation, 1);    // allow redirects
curl_setopt($ch, curlopt_returntransfer,1); // return into a variable
curl_setopt($ch, curlopt_port, 80);            //set the port number
curl_setopt($ch, curlopt_timeout, 15); // times out after 15s

curl_setopt($ch, curlopt_useragent, $user_agent);

$document = curl_exec($ch);

$search = array('@<script>]*?>.*?</script>@si', // strip out javascript教程 www.bkjia.com
'@[^>

);

$text = preg_replace($search, "n", html_entity_decode($document));

$pat[0] = "/^s+/";
$pat[2] = "/s+$/";
$rep[0] = "";
$rep[2] = " ";

$text = preg_replace($pat, $rep, trim($text));

return $text;
}