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php正则preg_replace_callback函数用法实例_PHP教程

php正则preg_replace_callback函数用法实例

　　本文实例讲述了php正则preg_replace_callback函数的用法。分享给大家供大家参考。具体实现方法如下：

　　php正则表达式功能强大，本范例演示了preg_replace_callback函数的用法

// Define a dummy text, for testing...

$Text = "Title: Hello world!\n";

$Text .= "Author: Jonas\n";

$Text .= "This is a example message!\n\n";

$Text .= "Title: Entry 2\n";

$Text .= "Author: Sonja\n";

$Text .= "Hello world, what's up!\n";

// This function will replace specific matches

// into a new form

function RewriteText($Match){

// Entire matched section:

// --> /.../

$EntireSection = $Match[0];

// --> "\nTitle: Hello world!"

// Key

// --> ([a-z0-9]+)

$Key = $Match[1];

// --> "Title"

// Value

// --> ([^\n\r]+)

$Value = $Match[2];

// --> "Hello world!"

// Add some bold () tags to around the key to

return '' . $Key . ': ' . $Value;

}

// The regular expression will extract and pass all "key: value" pairs to

// the "RewriteText" function that is definied above

$NewText = preg_replace_callback('/[\r\n]([a-z0-9]+): ([^\n\r]+)/i', "RewriteText", $Text);

// Print the new modified text

print $NewText;

　　希望本文所述对大家的php程序设计有所帮助。

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