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PHP | key() Function

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.


Following below is the syntax to use this function -

key ( $array );

Parameter Details

Sr.NoParameter & Description


It specifies an array

Return Value

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


Try out the below example -

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


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


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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