What is the difference between using in_array() and array_key_exists() to check for subarrays in PHP?

When checking for subarrays in PHP, in_array() is used to check if a specific value exists within an array, while array_key_exists() is used to check if a specific key exists within an array. Therefore, if you want to check for the existence of a subarray in PHP, you should use array_key_exists() to check for the key of the subarray. 

// Example array
$array = array(
    'subarray' => array('value1', 'value2', 'value3')
);

// Using array_key_exists() to check for the existence of the subarray
if(array_key_exists('subarray', $array)) {
    echo 'Subarray exists';
} else {
    echo 'Subarray does not exist';
}

Keywords

in_array array_key_exists subarrays PHP difference

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