Check if the integer key "0" exists in an array: in PHP

Description

The following code shows how to check if the integer key "0" exists in an array:.

Example

// w w  w .  j a va 2 s. co m
    <?php
      $a=array("XML","CSS");
      if (array_key_exists(0,$a)){
         echo "Key exists!";
      }else{
         echo "Key does not exist!";
      }
?>

The code above generates the following result.