<?php
/*
span :: (a -> Bool) -> [a] -> ([a],[a])
span _ xs@[] = (xs, xs)
span p xs@(x:xs')
| p x = let (ys,zs) = span p xs' in (x:ys,zs)
| otherwise = ([],xs)
*/
function span($p, $xs) {
if (empty($xs)) {
return [[], []];
}
$xs_ = $xs;
$x = array_shift($xs_);
if ($p($x)) {
list($ys, $zs) = span($p, $xs_);
return [array_merge([$x], $ys), $zs];
}
return [[], $xs];
}
/*
groupBy :: (a -> a -> Bool) -> [a] -> [[a]]
groupBy _ [] = []
groupBy eq (x:xs) = (x:ys) : groupBy eq zs
where (ys,zs) = span (eq x) xs
*/
function array_group(callable $eq, array $xs) {
if (empty($xs)) {
return [];
}
$x = array_shift($xs);
// curry of $eq
$eqx = function ($y) use ($eq, $x) { return $eq($x, $y); };
list($ys, $zs) = span($eqx, $xs);
return array_merge([array_merge([$x], $ys)], array_group($eq, $zs));
}
function it($m,$p){echo ($p?'OK':'NO')." It $m\n"; if(!$p){$GLOBALS['f']=1;}}
print_r(array_group(function ($a, $b) { return ($a == ($b-1)) || ($a==$b); }, [1, 1, 2, 1]));
- Output for 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 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 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] => Array
(
[0] => 1
[1] => 1
[2] => 2
[3] => 1
)
)
- Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29
- Parse error: syntax error, unexpected '[' in /in/qYKIo on line 12
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, 5.0.0 - 5.0.5
- Parse error: parse error, unexpected '[' in /in/qYKIo on line 12
Process exited with code 255. - Output for 4.3.2 - 4.3.4
- Parse error: parse error in /in/qYKIo on line 12
Process exited with code 255.
preferences:
238.05 ms | 401 KiB | 313 Q