PHP | key() 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 key() Function.

The PHP key() function returns the element key from current internal pointer position.

Syntax

Following below is the syntax to use this function -

key ( $array );

READ: PHP in_array() Function

Parameter Details

Sr.No	Parameter & Description
1	array(Required) It specifies an array

Return Value

This PHP function returns key on success, otherwise False on error.

Example

Try out the below example -

<?php
   $fruit = array(
      'f1' => 'apple',
      'f2' => 'orange',
      'f3' => 'grape',
      'f4' => 'apple',
      'f5' => 'apple');
      
   while ($f_name = current($fruit)) {
      if ($f_name == 'apple') {
         echo key($fruit)."\n";
      }
      next($fruit);
   }
?> 

Output

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

f1
f4
f5

READ: PHP extract() Function

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 krsort() Function.

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