Online PHP editor | refs for hd3hL

<?php /** * Generate a random string * * @link https://paragonie.com/b/JvICXzh_jhLyt4y3 * * @param int $length - How long should our random string be? * @param string $charset - A string of all possible characters to choose from * @return string */ function random_str($length = 32, $charset = 'abcdefghijklmnopqrstuvwxyz') { // Type checks: if (!is_numeric($length)) { throw new InvalidArgumentException( 'random_str - Argument 1 - expected an integer' ); } if (!is_string($charset)) { throw new InvalidArgumentException( 'random_str - Argument 2 - expected a string' ); } if ($length < 1) { // Just return an empty string. Any value < 1 is meaningless. return ''; } // Remove duplicate characters from $charset $split = str_split($charset); $charset = implode('', array_unique($split)); // This is the maximum index for all of the characters in the string $charset $charset_max = strlen($charset) - 1; if ($charset_max < 1) { // Avoid letting users do: random_str($int, 'a'); -> 'aaaaa...' throw new LogicException( 'random_str - Argument 2 - expected a string that contains at least 2 distinct characters' ); } // Now that we have good data, this is the meat of our function: $random_str = ''; for ($i = 0; $i < $length; ++$i) { $r = random_int(0, $charset_max); $random_str .= $charset[$r]; } return $random_str; } /* ------------------------------------------------------------------------ */ var_dump(random_str(10)); var_dump(random_str(16, '0123456789')); var_dump(random_str(8, '0123456789abcdef')); var_dump(random_str(24, 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+.'));