array_keys
(PHP 4 )
array_keys -- Return all the keys of an array
Description
array array_keys ( array input [, mixed search_value])
array_keys() returns the keys, numeric and string, from
the input array.
If the optional search_value is specified, then only the
keys for that value are returned. Otherwise, all the keys
from the input are returned.
Example 1. array_keys() example
<?php
$array = array(0 => 100, "color" => "red");
print_r(array_keys($array));
$array = array("blue", "red", "green",
"blue", "blue");
print_r(array_keys($array, "blue"));
$array = array("color" => array("blue",
"red", "green"),
"size" => array("small", "medium",
"large"));
print_r(array_keys($array));
?>
The printout of the program above will be:
Array
(
[0] => 0
[1] => color
)
Array
(
[0] => 0
[1] => 3
[2] => 4
)
Array
(
[0] => color
[1] => size
)
See also array_values() and array_key_exists().
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