Benchmarks for PHP's Early Returns vs. Do While False

earlyreturns-vs-dowhilefalse-benchmark.php

<?php
define( 'ITERATIONS', 10000000 );

$earlyreturn = time_it( 'early returns (w/value): ', function($condition) { earlyreturn1($condition); });
$dowhilefalse = time_it( 'do while false (w/value):', function($condition) { dowhilefalse1($condition); });

printf( "\nPercent increase (w/value): %.3f", ($dowhilefalse-$earlyreturn)/$dowhilefalse );
printf( "\nPercent difference (w/value): %.3f", 1-($dowhilefalse-$earlyreturn)/$dowhilefalse );

$earlyreturn = time_it( "early returns (no value): ", function($condition) { earlyreturn2($condition); });
$dowhilefalse = time_it( "do while false (no value):", function($condition) { dowhilefalse2($condition); });

printf( "\nPercent increase (no value): %.3f", ($dowhilefalse-$earlyreturn)/$dowhilefalse );
printf( "\nPercent difference (no value): %.3f", 1-($dowhilefalse-$earlyreturn)/$dowhilefalse );


function time_it( $what, $callable ) {
	$time_start = microtime( true );
	$condition = true;
	for ( $i = 0; $i < ITERATIONS; $i ++ ) {
		call_user_func( $callable, $condition );
		$condition = !$condition;
	}
	printf( "\n%s %s %.3f",
		number_format(ITERATIONS),
		$what,
		$delta = microtime( true ) - $time_start
	);
	return $delta;
}

function earlyreturn1($condition) {
	if ($condition) {
		return null;
	}
	return 1;
}

function dowhilefalse1($condition) {
	do {
		$value = null;
		if ($condition) {
			break;
		}
		$value = 1;
	} while (false);
	return $value;
}


function earlyreturn2($condition) {
	if ($condition) {
		return;
	}
	return;
}

function dowhilefalse2($condition) {
	do {
		if ($condition) {
			break;
		}
	} while (false);
	return;
}