Function lazy-loading

function.lazy.loader.php

<?php

/**
Function lazy-loading with anonymous functions (closures)
Benefit: we can evaluate each test on demand instead of evaluating all, and find the failed.
*/

// Test case selector
$testCase = "closure";
//$testCase = "direct-call";

// Test functions
function trueTest() {
	return true;
}

function falseTest() {
	return false;
}

function veryHeavyTest() {
	for($i=0;$i<100000000;$i++) {
		$a = 0;
	}
	die("It takes too long");
}



if($testCase == "closure") {
	$arrayWithAnonFunc = array(
		"x" => function() {
			return trueTest();
		},
		"y" => function() {
			return falseTest();
		},
		"z" => function() {
			return veryHeavyTest();
		}
	);
	var_dump($arrayWithAnonFunc);
	
	// Find the first failed test
	foreach($arrayWithAnonFunc as $key => $anonymousFunction) {
		if($anonymousFunction() == false) die("Test Failed @ " . $key);
	}
}


if($testCase == "direct-call") {
	$arrayWithoutAnonFunc = array(
		"x" => trueTest(),
		"y" => falseTest(),
		"z" => veryHeavyTest()
	);
	var_dump($arrayWithoutAnonFunc);
	
	// Find the first failed test
	foreach($arrayWithoutAnonFunc as $key => $function) {
		if($function() == false) die("Test Failed @ " . $key);
	}
}