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run code in 200+ php & hhvm versions
Bugs & Features
<?php error_reporting(-1); $array = array(array('id' => 1, 'fid' => 2), array('id' => 2, 'fid' => 2)); class Map { public static function byProperty(array $array, $property) { $map = array(); foreach ($array as $record) { $propValue = self::_getPropertyValue($record, $property); $map[$propValue][] = $record; } return $map; } public static function byMultiProperty(array $array, array $properties) { $map = array(); $lastProperty = end($property); foreach($array as $record) { $pointer = $map; foreach($properties as $property) { $propValue = self::_getPropertyValue($record, $property); if(!isset($pointer[$propValue])) { $pointer[$propValue] = array(); } $pointer = &$pointer[$propValue]; if($property === $lastProperty) { $pointer[] = $record; } } } return $map; } /** * @param mixed $record * @param string $property * @return mixed */ private static function _getPropertyValue($record, $property) { if (is_array($record)) { return isset($record[$property]) ? $record[$property] : null; } if (is_object($record)) { return isset($record->$property) ? $record->$property : null; } throw new InvalidArgumentException(sprintf('Unsupport record type: %s', gettype($record))); } } var_dump(Map::byMultiProperty($array, array('fid', 'id')));
based on HE2od
Output for 5.3.0 - 7.2.0
Warning: end() expects parameter 1 to be array, null given in /in/hsA2o on line 21 array(0) { }
Output for 5.1.0 - 5.2.17
Warning: end(): Passed variable is not an array or object in /in/hsA2o on line 21 array(0) { }
Output for 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_ARRAY, expecting '&' or T_VARIABLE in /in/hsA2o on line 8
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/hsA2o on line 8
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/hsA2o on line 8
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `T_OLD_FUNCTION' or `T_FUNCTION' or `T_VAR' or `'}'' in /in/hsA2o on line 8
Process exited with code 255.