Laravel array_only_recursive

array_only_recursive

/** 
 * matches a string to an array of key-patterns
 * @param $string - the string to match
 * @param $keys - array of key-patterns. can a a simple string key, dot-notated key, a wilcard key
 * @return boolean
 *
 * usage: 
 *   match_key_patterns('person.name', ['person.name', 'person.age', 'account.*']) => returns TRUE as person.name matches a value in the keys
 *   match_key_patterns('person.bday', ['person.name', 'person.age', 'account.*']) => returns FALSE as person.bday did not match a value in the keys
 *   match_key_patterns('account.password', ['person.name', 'person.age', 'account.*']) => returns TRUE as account.password matches a wilcard key pattern which is account.*
 */
function match_key_patterns($string, $keys) {
    foreach($keys as $key) {
        $re_str = preg_replace('/\./', '\\.', $key); 
        $re_str = preg_replace('/\\*/', '(.+)', $re_str); 

        $pattern = '#^(' . $re_str. ')$#';

        if(preg_match($pattern, $string)) {
            return true;
        }
    }

    return false; 
}


/** 
 * performs an array_only recursively. 
 * usage: similar to array_only except $keys will always be an array
 * @param $data - the array to be filtered
 * @param $keys - the keys to filter
 * @return array
 */ 
function array_only_recursive($data, array $keys) {
    $result = [];

    if(!is_array($data)) {
        return [];
    }

    foreach($data as $key => $value) {
        $curr_key = [];    

        $parent_keys = func_get_arg(2); 
        if($parent_keys !== FALSE) $curr_key[] = $parent_keys;

        $curr_key[] = $key;

        $curr_key = implode('.', $curr_key);

        if(in_array($key, $keys, true)) {
            array_set($result, $curr_key, $value);
        } else {
            if(match_key_patterns($curr_key, $keys)) {
                array_set($result, $curr_key, $value);
            } else {
                $result = array_replace_recursive($result, 
                            array_only_recursive($value, $keys, $curr_key));
            }
        }
    }

    return $result;
}


/** 
Usage: 
$data = [
    'account' => [
        'email' => '[email protected]',
        'username' => 'justmyuser'
    ],
    'profile' => [
        'name' => 'John Doe',
        'bday' => '1990-01-01',
        'country' => 'United States'
    ]
];

array_only_recursive($data, ['*']);  
// return: exactly the content of $data

array_only_recursive($data, ['account.email', 'profile.name']); 
// return: ['account' => ['email' => '[email protected]'], 'profile' => ['name' => 'John Doe']]

array_only_recursive($data, ['account.username', 'profile.*']); 
// return: ['account' => ['username' => 'justmyuser'], 'profile' => [
        'name' => 'John Doe',
        'bday' => '1990-01-01',
        'country' => 'United States'
    ]]

*/