ComunicAPI/functions/strings.php

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<?php
/**
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* Strings methods
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*
* @author Pierre HUBERT
*/
/**
* Generate a random string, using a cryptographically secure
* pseudorandom number generator (random_int)
*
* @param int $length How many characters do we want?
* @param string $keyspace A string of all possible characters
* to select from
* @return string
*/
function random_str($length, $keyspace = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ')
{
$str = '';
$max = mb_strlen($keyspace, '8bit') - 1;
for ($i = 0; $i < $length; ++$i) {
$str .= $keyspace[random_int(0, $max)];
}
return $str;
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}