This section demonstrates the use of array_key_exists() function in php

• array_key_exists() function is used to check whether the given key is present in the given array or not.

PHP Array Contains Key Example

<?php

      $ar=array("d"=>"daisy","m"=>"marigold","r"=>"rose","l"=>"lotus");

      $b=array_key_exists("r",$ar);

       if($b){

        echo "r is key in the array";

       }

      else

      echo "r is not the key in the array";

      echo"<br>";

       $b1=array_key_exists("a",$ar);

      if($b1){

       echo "a is key in the array"; 

       }

      else {

      echo "a is not the key in the array";

     }

?>

Output
r is key in the array
a is not the key in the array

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