array_flip
(PHP 4, PHP 5, PHP 7, PHP 8)
array_flip — Exchanges all keys with their associated values in an array
Description
Note that the values of array need to be valid
keys, i.e. they need to be either int 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 value, and all others will be lost.
Parameters
array-
An array of key/value pairs to be flipped.
Return Values
Returns the flipped array.
Examples
Example #1 array_flip() example
<?php
$input = array("oranges", "apples", "pears");
$flipped = array_flip($input);
print_r($flipped);
?>
The above example will output:
Array
(
[oranges] => 0
[apples] => 1
[pears] => 2
)
Example #2 array_flip() example : collision
<?php
$input = array("a" => 1, "b" => 1, "c" => 2);
$flipped = array_flip($input);
print_r($flipped);
?>
The above example will output:
Array
(
[1] => b
[2] => c
)
array_first
Array Functions