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
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// 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 (<b>) tags to around the key to
return '<b>' . $Key . '</b>: ' . $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 ;
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希望本文所述对大家的php程序设计有所帮助。