- array_shift: documentation ( source)
<?php
$x = function ($v) {
return $v * 2;
};
$y = function ($v) {
return $v * 2;
};
$z = function ($v) {
return $v * 200;
};
$compose_ = function ($documentation) {
$closures = func_get_args();
array_shift($closures);
// er($args,'$args');
return function ($param = null) use ($documentation, $closures) {
if (!$param) { return $documentation; }
$first_closure = array_shift($closures);
$val = $first_closure($param);
foreach ($closures as $closure) {
$val = $closure($val);
}
return $val;
};
};
$c = $compose_('Compose of Int -> $x -> $y -> $z -> Int', $x, $y, $z);
echo $c();
echo $c(345);