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Implementation of array_column function for PHP 5.3+, support for array of objects is also provided.
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<?php | |
/** | |
* Implementation of array_column function for PHP 5.3+, support for array of objects is also provided. | |
* | |
* @param array $input | |
* @param mixed $column_key | |
* @param mixed $index_key | |
* @return array | |
* @see http://php.net/manual/en/function.array-column.php | |
*/ | |
function arrayColumn($input, $column_key, $index_key = null) | |
{ | |
if (func_num_args() < 2) { | |
trigger_error('array_column() expects at least 2 parameters, '.func_num_args().' given', E_USER_WARNING); | |
return null; | |
} elseif (!is_array($input)) { | |
trigger_error('array_column() expects parameter 1 to be array, '.gettype($input).' given', E_USER_WARNING); | |
return null; | |
} | |
if ($index_key) { | |
return array_combine( | |
arrayColumn($input, $index_key), | |
arrayColumn($input, $column_key) | |
); | |
} | |
// If an array of objects is provided, then public properties can be directly pulled. | |
// In order for protected or private properties to be pulled, the class must implement both the | |
// __get() and __isset() magic methods. | |
foreach ($input as $key => $val) { | |
if (is_object($val) && !in_array($column_key, get_object_vars($val)) && | |
(!method_exists($val, '__get') || !method_exists($val, '__isset'))) { | |
unset($input[$key]); | |
} | |
} | |
$input_count = count($input); | |
return array_map( | |
function ($element, $column_name) { | |
if (is_object($element)) { | |
return $element->{$column_name}; | |
} | |
return $element[$column_name]; | |
}, | |
$input, | |
$input_count ? array_fill(0, $input_count, $column_key) : array() | |
); | |
} |
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