(PECL imagick 2 >= 2.3.0, PECL imagick 3)
Imagick::decipherImage — Deciphers an image
$passphrase): boolDeciphers image that has been enciphered before. The image must be enciphered using Imagick::encipherImage(). 此方法在Imagick基于ImageMagick 6.3.9以上版本编译时可用。
passphraseThe passphrase
成功时返回 true。