PHP: Hypertext Preprocessor (original) (raw)
`A polyfill serves the purpose of retroactively incorporating new features from PHP releases into older PHP versions, ensuring API compatibility.
In PHP 7.3.0, the array_key_first() function was introduced, demonstrated in the following example:
'first_value', 'second_key' => 'second_value', ];var_dump(array_key_first($array));?>The provided polyfill in this documentation allows the convenient use of array_key_first() with API compatibility in PHP versions preceding PHP 7.3.0, where the function was not implemented:
key=>key => key=>unused) { return $key; } return null; } }$array = [ 'first_key' => 'first_value', 'second_key' => 'second_value', ];var_dump(array_key_first($array));?>`