PHP array_keys() Function

Hello folks! welcome back to a new section of our tutorial on PHP. In this tutorial guide, we are going to be studying about the PHP array_keys() Function.

The array_keys() function returns the keys, numeric and string, from the input array.

Syntax

Following below is the syntax to use this function -

array_keys ( $input [, $search_value [, $strict]] );

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Parameter Details

Sr.No	Parameter & Description
1	input(Required) It specifies an array.
2	search_value(Required) You can specify a value, then only the keys with this value are returned.
3	strict Optional. Used with the value parameter.

Return Value

It returns the keys, numeric and string, from the input array.

Example

Try out the below example -

<?php
   $input = array("a"=>"Monkey","b"=>"Cat","c"=>"Dog");
   print_r(array_keys($input));
   
   $input = array("a"=>"Monkey","b"=>"Cat","c"=>"Dog");
   print_r(array_keys($input,"Dog"));
   
   $input = array(10,20,30,"10");
   print_r(array_keys($input,"10",false));
?> 

Output

When the above code is executed, it will produce the following result -

Array ( [0] => a [1] => b [2] => c ) Array ( [0] => c ) Array ( [0] => 0 [1] => 3 )

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Alright guys! This is where we are going to be rounding up for this tutorial post. In our next tutorial, we are going to be discussing about the PHP array_map() Function.

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