array_keys() function in php

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array_keys() function of PHP is used to return all keys of an array means it returns an array which contains all keys of existing array. It is an inbuilt function of PHP.

Syntax:

array_key s($arr);

Here,

$arr is a PHP array.

Example:

<?php
$arr1= array("fruit1"=>"Apple","fruit2"=>"Banana","fruit3"=>"Orange","fruit4"=>"Pear");
$result=array_keys($arr1);
echo "<pre>";
print_r($result);
?>

Output: