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PHP encryption and decryption class

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PHP encryption and decryption class

<?php
class crypt {
  private $skey;
  public function __construct($key) {
    $this->skey = hash("md5", $key, true); //32位skey
  }
  public function safe_b64encode($string) {
    $data = base64_encode($string);
    $data = str_replace(array('+', '/', '='), array('-', '_', ''), $data);
    return $data;
  }
  public function safe_b64decode($string) {
    $data = str_replace(array('-', '_'), array('+', '/'), $string);
    $mod4 = strlen($data) % 4;
    if ($mod4) {
      $data .= substr('====', $mod4);
    }
    return base64_decode($data);
  }

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