Example of AES bi directional encryption and decryption function implemented by PHP [128 bits]

This paper describes the bidirectional encryption and decryption function of AES realized by PHP. Share it for your reference, as follows:

<?php
/*
 * Created on 2018-9-1
 *
 * To change the template for this generated file go to
 * Window - Preferences - PHPeclipse - PHP - Code Templates
 */
 /**
  Usage: 
 Security::encrypt($str,$key);
 Security::decrypt($str,$key);
 */
 class Security {
  public static function encrypt($input, $key) {
   $size = mcrypt_get_block_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_ECB);
   $input = Security::pkcs5_pad($input, $size);
   $td = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_ECB, '');
   $iv = mcrypt_create_iv (mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
   mcrypt_generic_init($td, $key, $iv);
   $data = mcrypt_generic($td, $input);
   mcrypt_generic_deinit($td);
   mcrypt_module_close($td);
   $data = base64_encode($data);
   return $data;
  }
  private static function pkcs5_pad ($text, $blocksize) {
   $pad = $blocksize - (strlen($text) % $blocksize);
   return $text . str_repeat(chr($pad), $pad);
  }
  public static function decrypt($sStr, $sKey) {
   $decrypted= mcrypt_decrypt(
    MCRYPT_RIJNDAEL_128,
    $sKey,
    base64_decode($sStr),
    MCRYPT_MODE_ECB
   );
   $dec_s = strlen($decrypted);
   $padding = ord($decrypted[$dec_s-1]);
   $decrypted = substr($decrypted, 0, -$padding);
   return $decrypted;
  }
 }
// Usage example: 
$str = "www.ofstack.com";
$key = "123456";
echo " Original string: ".$str."<br/>";
$pwdstr = Security::encrypt($str,$key);
echo " After encryption: ".$pwdstr."<br/>";
$destr = Security::decrypt($pwdstr,$key);
echo " Decryption result: ".$destr;
?>

Run results:

Original string: www. ofstack. com
After encryption: O0vbyikeZRVnXueCodfSFw==
Decryption result: www. ofstack. com

PS: Friends who are interested in encryption and decryption can also refer to the online tools of this site:

Text online encryption and decryption tools (including AES, DES, RC4, etc.):
http://tools.ofstack.com/password/txt_encode

MD5 Online Encryption Tool:
http://tools.ofstack.com/password/CreateMD5Password

Online hash/hash algorithm encryption tool:
http://tools.ofstack.com/password/hash_encrypt

Online MD5/hash/SHA-1/SHA-2/SHA-256/SHA-512/SHA-3/RIPEMD-160 Encryption Tool:
http://tools.ofstack.com/password/hash_md5_sha

Online sha1/sha224/sha256/sha384/sha512 Encryption Tool:
http://tools.ofstack.com/password/sha_encode

For more readers interested in PHP related contents, please check the special topics of this site: "Summary of php Encryption Methods", "Summary of PHP Encoding and Transcoding Operation Skills", "Summary of PHP Mathematical Operation Skills", "Encyclopedia of PHP Array (Array) Operation Skills", "Summary of php String (string) Usage", "Tutorial on PHP Data Structure and Algorithm", "Summary of php Programming Algorithm" and "Summary of php Regular Expression Usage"

I hope this article is helpful to everyone's PHP programming.