PHP array_key_exists() Function

Hello dear readers! welcome back to another section of our tutorial on PHP. In this tutorial, we will be studying about the PHP Function array_key_exists().

PHP array_key_exists() function returns TRUE if the given key is set in the array.


Following below is the syntax to use this function -

bool array_key_exists ( $key, $array );

Parameter Details

Sr.NoParameter & Description


The key to be searched.



This is an array to be searched

Return Value

It returns TRUE if the given key exists in the array, else False.


Try out the below example -

   $input = array('first' => 10, 'second' => 400);
   if (array_key_exists('first', $input)) {
      echo "The 'first' element is in the array";


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

The 'first' element is in the array

Alright guys! This is where we are rounding up for this tutorial post. In our next tutorial, we will discuss about PHP array_keys() Function.

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