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@ 2014-10-31T13:03:37Z

<?php

function find_group($cond, &$arr, $e = null)
{
  if ($cond($e, reset($arr) || $e === null))
  {
    $e = array_shift($arr);
    return array_merge([$e], find_group($cond, $arr, $e));
  }

  return [];
}

function array_group($cond, $arr)
{
  if (empty($arr)) return [];

  /*while($cond($e, reset($arr)))
  {
    $g[] = array_shift($arr);
  }*/

  return array_merge([find_group($arr, $cond)], array_group($cond, $arr));
}


function it($m,$p){echo ($p?'OK':'NO')." It $m\n";}
function eq($a,$b) {return $a==$b;}

echo it ('groups', array_group('eq', [1,5,5,6,6,6,7,9]) == [[1],[5,5],[6,6,6],[7],[9]]);
echo it ('groups by comparing with first item of each group', array_group(function ($a, $b) { return ($a == ($b-1)) || ($a==$b); }, [1,1,2,3,1]) == [[1,1,2],[3],[1]]);
echo it ('groups by comparing with first item of each group', array_group(function ($a, $b) { return ($a == ($b-1)) || ($a==$b); }, [1,1,2,1,3,1]) == [[1,1,2,1],[3],[1]]);

Output for git.master, git.master_jit, rfc.property-hooks: Fatal error: Uncaught Error: Array callback must have exactly two elements in /in/sTUsn:5 Stack trace: #0 /in/sTUsn(23): find_group(Array, 'eq') #1 /in/sTUsn(30): array_group('eq', Array) #2 {main} thrown in /in/sTUsn on line 5
Process exited with code 255.

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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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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