What is the best practice for removing keys from an array that do not contain a value in PHP?

To remove keys from an array that do not contain a value in PHP, you can loop through the array and use the `unset()` function to remove any keys that have a null or empty value. This can be achieved by iterating over the array and checking if the value is empty, and if so, removing the key using `unset()`. 

$array = [
    'key1' => 'value1',
    'key2' => '',
    'key3' => null,
    'key4' => 'value4'
];

foreach ($array as $key => $value) {
    if (empty($value)) {
        unset($array[$key]);
    }
}

print_r($array);

Keywords

unset array_filter empty array_keys array_values

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