Mcrypt reversible encryption algorithm in PHP _ PHP Tutorial

The Mcrypt reversible encryption algorithm in PHP. What is the reversible Mcrypt encryption algorithm in PHP? Php Tutorial $ tdmcrypt_module_open (MCRYPT_DES, ecb,); use the MCRYPT_DES algorithm, ecb mode $ ivmcrypt_create_iv (mcrypt_enc_get_iv_size ($ t Mcrypt reversible encryption algorithm in PHP

$ Td = mcrypt_module_open (MCRYPT_DES, '', 'ECB ',''); // use the MCRYPT_DES algorithm in ecb mode.

$ Iv = mcrypt_create_iv (mcrypt_enc_get_iv_size ($ td), MCRYPT_RAND );
$ Ks = mcrypt_enc_get_key_size ($ td );

$ Key = "ery secret key"; // key
$ Key = substr (md5 ($ key), 0, $ ks );

Mcrypt_generic_init ($ td, $ key, $ iv); // initial processing

// Encryption
$ Encrypted = mcrypt_generic ($ td, 'This is very important data ');

// End processing
Mcrypt_generic_deinit ($ td );

// Initial decryption
Mcrypt_generic_init ($ td, $ key, $ iv );

// Decrypt
$ Decrypted = mdecrypt_generic ($ td, $ encrypted );

// End
Mcrypt_generic_deinit ($ td );

Mcrypt_module_close ($ td );

// After decryption, it may be followed up and should be removed
Echo trim ($ decrypted). "n ";

Mcrypt reversible encryption algorithm? Php Tutorial $ td = mcrypt_module_open (MCRYPT_DES, '', 'ECB ',''); // use the MCRYPT_DES algorithm, ecb mode $ iv = mcrypt_create_iv (signature ($ t...