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array_flip
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array_flip

Name

array_flip — Transposes the keys and values of an array.

Synopsis

array array_flip(values); array values: Array of values to flip

Returns

Associative array; FALSE if given an invalid argument

Description

array_flip() converts the keys of an array into values and the values into keys, in effect transposing the keys and values of the array. This works for both indexed arrays and associative arrays.

If values contains multiple elements with the same value - which would cause the resulting array to have multiple identical keys - only the value of the last of these duplicates is used, and previous elements are lost.

Version

PHP 4 since 4.0b4

Example

Example 19. Transpose the keys and values of an array

$fruits = array('a' => 'apple', 
                'b' => 'banana', 
                'c' => 'carrot', 
                'd' => 'dachshund');
while(list($key,$val) = each($fruits)) {
   print("Key: $key -- Value: $val\n");
}
$flipped = array_flip($fruits);
while(list($key,$val) = each($flipped)) {
   print("Key: $key -- Value: $val\n");
}

Output:
Key: a -- Value: apple
Key: b -- Value: banana
Key: c -- Value: carrot
Key: d -- Value: dachshund
Key: apple -- Value: a
Key: banana -- Value: b
Key: carrot -- Value: c
Key: dachshund -- Value: d

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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.