array_map in php, with break

array-map-break-yield.php

<?php

class BreakOut extends Exception {}

function mapGenerator(array $arr, $callback)
{
	$ret = [];
	foreach ($arr as $val) {
		try {
			yield $callback($val);
		} catch (BreakOut $e) {
			return;
		}
	}
}

$a = range(1, 10);

$callback = function($val) {
	if ($val > 5) {
		throw new BreakOut;
	}

	return $val * $val;
};

foreach (mapGenerator($a, $callback) as $v) {
	echo $v . PHP_EOL;
}

array-map-break.php

<?php

class BreakOut extends Exception {}

function map(array $arr, $callback)
{
	$ret = [];
	foreach ($arr as $val) {
		try {
			$ret[] = $callback($val);
		} catch (BreakOut $e) {
			break;
		}
	}
	return $ret;
}

$a = range(1, 10);

$callback = function($val) {
	if ($val > 5) {
		throw new BreakOut;
	}

	return $val * $val;
};

print_r(map($a, $callback));