What are the benefits of using array_key_exists() over isset() for checking array keys in PHP?

When checking for the existence of keys in an array in PHP, it is common to use either `array_key_exists()` or `isset()`. While both functions can be used for this purpose, `array_key_exists()` is specifically designed to check if a key exists in an array, whereas `isset()` can also return true for keys with null values. Therefore, using `array_key_exists()` is more precise and can prevent potential bugs in your code. 

// Using array_key_exists() to check if a key exists in an array
$array = ['key1' => 'value1', 'key2' => null];

if (array_key_exists('key2', $array)) {
    echo 'Key exists in the array';
} else {
    echo 'Key does not exist in the array';
}

Keywords

array_key_exists isset checking array keys PHP

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