array_flip
(PHP 4, PHP 5)
array_flip — Exchanges all keys with their associated values in an array
Description
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 flipped.
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
)
See Also
- array_values() - Return all the values of an array
- array_keys() - Return all the keys or a subset of the keys of an array
- array_reverse() - Return an array with elements in reverse order