FuncBench.php

<?php

function indirectStringToUpper($word) {
	return strtoupper($word);
}

class FuncBench {
	public function benchLoopDirectFunction() {
		$words = ['i', 'am', 'not', 'shouting'];
		$shouts = [];

		foreach($words as $word) {
			$shouts[] = strtoupper($word);
		}
	}

	public function benchLoopIndirectFunction() {
		$words = ['i', 'am', 'not', 'shouting'];
		$shouts = [];

		foreach($words as $word) {
			$shouts[] = indirectStringToUpper($word);
		}
	}

	public function benchLoopClosure() {
		$words = ['i', 'am', 'not', 'shouting'];
		$shouts = [];

		$closure = function($word) {
			return strtoupper($word);
		};

		foreach($words as $word) {
			$shouts[] = $closure($word);
		}
	}

	public function benchMapDirectFunction() {
		$words = ['i', 'am', 'not', 'shouting'];
		$shouts = [];

		$shouts = array_map('strtoupper', $words);
	}

	public function benchMapIndirectFunction() {
		$words = ['i', 'am', 'not', 'shouting'];
		$shouts = [];

		$shouts = array_map('indirectStringToUpper', $words);
	}

	public function benchMapClosure() {
		$words = ['i', 'am', 'not', 'shouting'];
		$shouts = [];

		$shouts = array_map(function($word) {
			return strtoupper($word);
		}, $words);
	}
}