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@ 2014-12-24T15:10:43Z

<?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();
        $lastProperty = end($properties);
        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')));

Output for 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6: array(0) { }
Output for 5.0.0 - 5.0.5: Parse error: parse error, unexpected T_ARRAY, expecting '&' or T_VARIABLE in /in/XkcE1 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/XkcE1 on line 8
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1: Parse error: parse error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/XkcE1 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/XkcE1 on line 8
Process exited with code 255.

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