PHP Password Hashing

<?php
    /*-------------SimpleBB.net--------------\
    |  Project Start Date 02-February-2015;  |
    |  Project Developer Mike M;         |
    |  Project Type: Ebay Linking;       |
    \--------------SimpleBB.net-------------*/
    class Account_Functions{

        function __Construct(){

        }

        /**
         *   A method to generate randomized data [RDG | Random Data Generator] for example salting or session keys
         *  @param integer $length DESCRIPTION: used to set a length that key should have
         *  @param boolean $base64encode OPTIONAL DESCRIPTION: if true it will use base64_encode() on the return data
         *  @param boolean $isSalt OPTIONAL DESCRIPTION: if true it will base64_encode() on the return data and will truncate the size to 22
         *  @return string $value DESCRIPTION: returns the randomized data
         */
        function RDG($length, $base64encode = false, $isSalt = false){

            if(!is_integer($length)){
                trigger_error("RDG(): expects parameter 1 to be an integer, ".gettype($length)." given", E_USER_ERROR);
            }

            if(!is_bool($base64encode)){
                trigger_error("RDG(): expects parameter 2 to be a boolean, ".gettype($base64encode)." given", E_USER_ERROR);
            }

            if(!is_bool($isSalt)){
                trigger_error("RDG(): expects parameter 3 to be a boolean, ".gettype($base64encode)." given", E_USER_ERROR);
            }

            if($isSalt){
                $base64encode = true;
            }

            if(function_exists('mcrypt_create_iv')){
                $value = @mcrypt_create_iv($length, MCRYPT_DEV_URANDOM);
                if($value === ""){
                    $value = @mcrypt_create_iv($length, MCRYPT_DEV_RANDOM);
                    if($value === ""){
                        trigger_error("MCRYPT_DEV_RANDOM and/or MCRYPT_DEV_URANDOM are/is not available", E_USER_ERROR);
                    }
                }
            }else if(function_exists('openssl_random_pseudo_bytes')){
                $value = openssl_random_pseudo_bytes($length);
                if($value === ""){
                    trigger_error("openssl_random_pseudo_bytes() is not available", E_USER_ERROR);
                }

            }else{
                trigger_error("mcrypt_create_iv() and openssl_random_pseudo_bytes() are not available", E_USER_ERROR);
            }

            if($base64encode){
                $value = rtrim(base64_encode($value), "=");
                $value = str_replace("+", ".", $value);
            }

            if($isSalt){
                $value = substr($value, 0, 22);
                if(strlen($value) <> 22){
                    trigger_error("The salt length must be 22", E_USER_ERROR);;
                }
            }

            return $value;
        }

        function pw_hash($password, $cost = 12){
            if(!function_exists('crypt')){
                trigger_error("crypt() is not available", E_USER_ERROR);
            }

            if(!is_string($password)){
                trigger_error("pw_hash(): expects parameter 1 to be a string,", E_USER_ERROR);
            }

            if(!is_integer($cost)){
                trigger_error("pw_hash(): expects parameter 2 to be an integer, ".gettype($cost)." given", E_USER_ERROR);
            }

            if($cost < 9){
                trigger_error("pw_hash(): expects value of parameter 2 to be greater than 8, ".$cost." given", E_USER_ERROR);
            }

            if($cost < 9){
                trigger_error("pw_hash(): expects value of parameter 2 to be greater than 8, ".$cost." given", E_USER_ERROR);
            }

            if($cost > 31){
                trigger_error("pw_hash(): expects value of parameter 2 to be smaller than 32, ".$cost." given", E_USER_ERROR);
            }


            if(strlen($password) < 7 || empty($password)){
                trigger_error("pw_hash(): expects value of parameter 1 to be greater than 7".strlen($password)." characters given", E_USER_ERROR);
            }

            $salt = SELF::RDG(22, true, true);

            if(version_compare(phpversion(), '5.3.7', '<')){
                $salt = '$2a$'.$cost.'$'.$salt;
            }else{
                $salt = '$2y$'.$cost.'$'.$salt;
            }

            $hashed = crypt($password, $salt);


            if(strlen($hashed) <> 60){
                trigger_error("pw_hash(): Returned password is not valid", E_USER_ERROR);
            }

            return array("Password" => $hashed, "Salt" => $salt, "Cost" => $cost);


        }
    }

    for($i = 0; $i < 20; $i++){
        var_dump(Account_Functions::pw_hash("{insert_password#@$%+=_here.}"));
        echo("<hr />");
    }


    /*-------------SimpleBB.net--------------\
    |  Project Start Date 02-February-2015;  |
    |  Project Developer Mike M;         |
    |  Project Type: Ebay Linking;       |
    \--------------SimpleBB.net-------------*/

?>