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<!DOCTYPE html> <html lang="en"> <head> <title>Example of Testing Whether a Key Exists in PHP Array</title> </head> <body> <?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"; } ?> </body> </html>
