Create random string (salt)

Salt.php

<?php

/**
 * Create random string.
 *
 * @param int $length
 * @return string
 */
function getRandomSalt($length=8)
{
    // char list
    $symbols=array_merge(
        range(0,9), range('a','z'), range('A','Z'),
        array(
            '!','@','#','$','%','^','&','*','(',')','{','}','<',
            '>','/','?',';','_',':','=','+','~','[',']','|','`',
        )
    );

    // random sort
    shuffle($symbols);

    // cut first N elements
    $randomSymbols=array_slice($symbols, 0, $length);

    // return the salt
    return implode('', $randomSymbols);
}