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@ 2013-04-11T06:24:39Z

<?php
/* @link http://stackoverflow.com/q/15931375/2261774 */

error_reporting(~0);

$array = array(
    array('Jan 2010', 65.75),
    array('Jan 2010', 211.05),
    array('Jan 2010', 582.7),
    array('Feb 2010', 136.3),
    array('Feb 2010', 215.32),
    array('Feb 2010', 413.9),
    array('Mar 2010', 156.35),
    array('Mar 2010', 210.54),
    array('Mar 2010', 585.15),
    array('Apr 2010', 126.1),
    array('Apr 2010', 255.47),
    array('Apr 2010', 329.1),
    array('May 2010', 109),
    array('May 2010', 170),
    array('May 2010', 716.7),
);

foreach($array as $key => &$entry) {
    list($month, $value) = $entry;
    if (isset($ptr[$month])) {
        $ptr[$month][] = $value;
        unset($array[$key]);
    } else {
        $ptr[$month] = &$entry;
    }
}
unset($ptr);

print_r($array);

Output for git.master, git.master_jit, rfc.property-hooks: Array ( [0] => Array ( [0] => Jan 2010 [1] => 65.75 [2] => 211.05 [3] => 582.7 ) [3] => Array ( [0] => Feb 2010 [1] => 136.3 [2] => 215.32 [3] => 413.9 ) [6] => Array ( [0] => Mar 2010 [1] => 156.35 [2] => 210.54 [3] => 585.15 ) [9] => Array ( [0] => Apr 2010 [1] => 126.1 [2] => 255.47 [3] => 329.1 ) [12] => Array ( [0] => May 2010 [1] => 109 [2] => 170 [3] => 716.7 ) )

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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