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PHP array_keys() Function

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.


Following below is the syntax to use this function -

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

Parameter Details

Sr.NoParameter & Description


It specifies an array.



You can specify a value, then only the keys with this value are returned.



Optional. Used with the value parameter.

Return Value

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


Try out the below example -

   $input = array("a"=>"Monkey","b"=>"Cat","c"=>"Dog");
   $input = array("a"=>"Monkey","b"=>"Cat","c"=>"Dog");
   $input = array(10,20,30,"10");


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 )

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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