PHP array_flip function

array_flip

(PHP 4, PHP 5)

array_flip -- Exchanges all keys with their associated values in an arrayDescriptionarray 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
flipped.

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

array_flip() returns FALSE
if it fails.

Example 1. array_flip() example

Example 2. array_flip() example : collision

now $trans is:

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

See also array_values(),
array_keys(), and
array_reverse().