PHP array_key_exists() Function

PHP array_key_exists() 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_key_exists() Function.

The array_key_exists() function returns true if the given key is set in the array.

Syntax

Following below is the syntax to use this function -

bool array_key_exists ( $key, $array );


Parameter Details

Sr.NoParameter & Description
1

key(Required)

The key to be searched.

2

array(Required)

This is an array to be searched


Return Value

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

Example

Try out the below example -

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

Output

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 going to be rounding up for this tutorial post. In our next tutorial, we are going to be discussing about PHP array_keys() Function.

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