How to check if a key exists in an array in PHP

Topic: PHP / MySQL« Prev|Next »

Answer: Use the PHP array_key_exists() function

You can use the PHP array_key_exists() function to test whether a given key or index exists in an array or not. This function returns TRUE on success or FALSE on failure.

  • <?php
  • $cities = array("France"=>"Paris", "India"=>"Mumbai", "UK"=>"London", "USA"=>"New York");
  • // Testing the key exists in the array or not
  • if(array_key_exists("France", $cities)){
  •     echo "The key 'France' is exists in the cities array";
  • }
  • ?>

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