php hash_file benchmark (requires dd for temp file generation)

hashtest.php

<?php

// will be passed to dd as bs=
$sizes = ['1K', '10K', '100K', '1M', '10M', '25M', '50M', '100M'];

// http://de3.php.net/manual/en/function.hash-algos.php
$algos = ['md5', 'sha256', 'sha512', 'ripemd320', 'whirlpool'];

echo "After test, please remove all *.hashtest temporary files in this directory\n";
echo "Preparing temporary files...\n";

// prepare temp files
foreach($sizes as $size) {
	$file = sprintf('%s.hashtest', $size);
	if(!file_exists($file)) {
		exec(sprintf('dd if=/dev/urandom of=%s count=1 bs=%s', $file, $size));
	}
}

// run test
echo "Running tests...\n";

$result = [];
foreach($algos as $algo) {
	printf("%s\n", $algo);
	$result[$algo] = [];
	
	foreach($sizes as $size) {
		$file = sprintf('%s.hashtest', $size);
		printf(" > %4s: ", $size);
		$t = microtime(true);
		hash_file($algo, $file);
		$t = microtime(true) - $t;
		$result[$algo][$size] = sprintf('%f', $t);
		printf("%f\n", $t);
	}
}

// CSV result
echo "\n\n";
printf("algo;%s\n", implode(';', $sizes));
foreach($result as $algo => $times) {
	printf("%s;%s\n", $algo, implode(';', $result[$algo]));
}