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preg_grep
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preg_grep

Name

preg_grep — Returns the elements of the input array that match the specified pattern.

Synopsis

array preg_grep(pattern, strings); string pattern: Perl regex pattern to match array strings: Array of strings to search

Returns

Array of elements matched

Description

This function traverses the input array, testing all elements against the supplied pattern. If a match is found, the matching element is returned as part of the array containing all matches.

Since PHP version 4.0.4, the elements in the result array are indexed by the keys they were associated with in the input array. That is, if the element with key 23 in the input array matches, it will be accessible as $outputarray[23]. If this behavior is not desirable, the result array can be run through the array_values() function to re-index it with sequential numeric indexes.

Version

Existing since version 3.0.9

Example

Example 1127. Search through array for matching elements

// Get all the names starting with letters A-M
$names = array('John', 'Patricia', 'Amy', 'Emilio', 'Tom', 'Wendel');
$result = preg_grep('!^[a-m]!i', $names);
// $result will contain 'John', 'Amy', 'Emilio'

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PHP Functions Essential Reference. Copyright © 2002 by New Riders Publishing (Authors: Zak Greant, Graeme Merrall, Torben Wilson, Brett Michlitsch). This material may be distributed only subject to the terms and conditions set forth in the Open Publication License, v1.0 or later (the latest version is presently available at http://www.opencontent.org/openpub/). The authors of this book have elected not to choose any options under the OPL. This online book was obtained from http://www.fooassociates.com/phpfer/ and is designed to provide information about the PHP programming language, focusing on PHP version 4.0.4 for the most part. The information is provided on an as-is basis, and no warranty or fitness is implied. All persons and entities shall have neither liability nor responsibility to any person or entity with respect to any loss or damage arising from the information contained in this book.