make a switch type check

StrictSwitch.php

<?php

class StrictSwitch
{
	private $val;

	private $done = false;

	public function __construct($val)
	{
		$this->val = $val;
	}

	public function case($a, $c)
	{
		if (!$this->done && $this->val === $a) {
			$this->done = true;
			$c();
		}

		return $this;
	}

	public function default($c)
	{
		if (!$this->done) {
			$this->done = true;
			$c();
		}

		return $this;
	}
}

$a = [
	'a',
	'b'
];

foreach ($a as $s) {
	(new StrictSwitch(true))
		->case(strpos($s, 'a') !== false, function () use ($s) {
			echo "a {$s}\n";
		})
		->case(strpos($s, 'b') !== false, function () use ($s) {
			echo "b {$s}\n";
		})
		->default(function () {
			echo "c\n";
		});
}

// c
// c