How do I check if a key exists in a dictionary

To check if a key exists in a dictionary in Python, you can use the `in` keyword. This allows you to determine if a specific key is present in the dictionary.

Here is a simple example:


    <?php
    $my_dict = array("name" => "John", "age" => 30, "city" => "New York");

    // Check if the key "age" exists in the dictionary
    if (array_key_exists("age", $my_dict)) {
        echo "Key 'age' exists in the dictionary.";
    } else {
        echo "Key 'age' does not exist in the dictionary.";
    }
    ?>