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Exchanges all keys with their associated values in an array


array_flip

(PHP 4, PHP 5)

array_flipExchanges all keys with their associated values in an array

Description

array array_flip ( array $trans )

array_flip() returns an array in flip order, i.e. keys from trans become values and values from trans become keys.

Note that the values of trans need to be valid keys, i.e. they need to be either integer or string. A warning will be emitted if a value has the wrong type, and the key/value pair in question will not be included in the result.

If a value has several occurrences, the latest key will be used as its values, and all others will be lost.

Parameters

trans

An array of key/value pairs to be flipped.

Return Values

Returns the flipped array on success and NULL on failure.

Examples

Example #1 array_flip() example

<?php
$trans 
array_flip($trans);
$original strtr($str$trans);
?>

Example #2 array_flip() example : collision

<?php
$trans 
= array("a" => 1"b" => 1"c" => 2);
$trans array_flip($trans);
print_r($trans);
?>

now $trans is:

 Array (  [1] => b  [2] => c ) 

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