PHP regular Preg_replace_callback Function usage Example _php tutorial

PHP regular Preg_replace_callback Function Usage example

This article describes the use of the PHP regular Preg_replace_callback function. Share to everyone for your reference. The implementation method is as follows:

PHP Regular expressions are powerful, and this example demonstrates the use of the Preg_replace_callback function

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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"; $Text. = "Hello world, What ' s up!\n"; This function would replace specific matches into a new form function Rewritetext ($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 would extract and pass all "key:value" pairs to The "Rewritetext" function is definied above $NewText = Preg_replace_callback ('/[\r\n] ([a-z0-9]+): ([^\n\r]+)/I ', "Rewritetext", $Text); Print the new modified text Print $NewText;

I hope this article is helpful to everyone's PHP programming.

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