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in_array — Searches an array for an occurrence of a given value.


bool in_array(target, array[, compare_types]);
mixed target: Value for which to search
array array: Array in which to search for target
bool compare_types (optional): Whether to compare types or just values


TRUE if the target value exists within the given array; FALSE otherwise


This function searches through array for an element with the value given by target . If compare_types is given and is TRUE, elements match only if they have the same value and type as target ; otherwise, only the values need to match.




Example 47. Check for the existence of a value within an array

$array = array(1, 2, '3', 4);
if (in_array(3, $array)) {
    echo "Found.\n";
} else {
    echo "Not found.\n";

if (in_array(3, $array, TRUE)) {
    echo "Found.\n";
} else {
    echo "Not found.\n";

Not found.

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 The authors of this book have elected not to choose any options under the OPL. This online book was obtained from 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.

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