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array_flip in php
array_flip - php
array_flip — Transposes the keys and values of an array.
Syntax
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
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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