Posted By

Brandon0 on 03/25/11

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Last Edited at 03/25/11 06:04am

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Random string generator

/ Published in: PHP

Testing a couple different ways to create a random string 3 characters long [a-zA-Z0-9]. Turns out mod is pretty quick!

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<?php

header('Content-Type: text/plain');

$chars = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
$chars_strlen = strlen($chars); //turns out this is fairly expensive; make sure to only do it once

$timer = microtime(true);
for ($i=0; $i<1000000; $i++) {
	$uid = $chars[rand(0, $chars_strlen-1)] . $chars[rand(0, $chars_strlen-1)] . $chars[rand(0, $chars_strlen-1)];
#	echo $uid . "\n";
}
echo microtime(true) - $timer . ' seconds using rand(0, strlen()-1)' . "\n"; # 1.6855049133301 seconds

echo "\n" . str_repeat('-', 80) . "\n\n";

$timer = microtime(true);
for ($i=0; $i<1000000; $i++) {
	$uid = substr(str_shuffle($chars), 0, 3);
#	echo $uid . "\n";
}
echo microtime(true) - $timer . ' seconds using str_shuffle()' . "\n"; # 1.9944579601288 seconds

echo "\n" . str_repeat('-', 80) . "\n\n";

$timer = microtime(true);
for ($i=0; $i<1000000; $i++) {
	$uid = $chars[rand() % $chars_strlen] . $chars[rand() % $chars_strlen] . $chars[rand() % $chars_strlen];
#	echo $uid . "\n";
}
echo microtime(true) - $timer . ' seconds using mod strlen()' . "\n"; # 1.0942420959473 seconds

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