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<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <title>PHP Check Whether an Index Exist in the Array</title> </head> <body> <pre> <?php // Sample array $cities = array("London", "Paris", "New York"); // Test if key exists in the array if(array_key_exists(0, $cities)){ echo "Key exists!"; } else{ echo "Key does not exist!"; } ?> </pre> </body> </html>
