PHP array_keys() Function is an inbuilt function in PHP and return the array of keys from the another given array. Given array may be associative array (key β value) pairs or indexed array. This function return an array.
Syntax
array array_keys ($array, $search_value, $strict)PHP array keys Function
$array (required): This argument refers to the main array in which you want to fetch the keys.
$search_value (optional): If this argument is passed then function will return the keys corresponding to this element otherwise it will return all the keys of the array.
$strict (optional): If this argument is true then strict comparison will be used during the search otherwise it has false as default value.
Return Value: This function will return an array of keys like indexed array.
Example 1
<?php
$arr = array("james" => 15, "david" => 18, "smith" => 34);
print_r(array_keys($arr));
?>Output
Array
(
[0] => james
[1] => david
[2] => smith
)Example 2
<?php
$arr = array("david","james","john","smith");
print_r(array_keys($arr));
?>Output
Array
(
[0] => 0
[1] => 1
[2] => 2
[3] => 3
)In the below program, passed the search value along with given array. Now it will return only those keys who has the search value.
Example 3
<?php
$arr = array("david","james","david","john","smith","david");
$search_value = "david";
print_r(array_keys($arr,$search_value));
?>Output
Array
(
[0] => 0
[1] => 2
[2] => 5
)More Related Post
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