这个是java的解密代码

private static final String IV = "ZZXJoOLvoTJ5u2BF";

private static final String KEY_ALGORITHM = "AES";
public static final String UTF_8 = "UTF-8";
public static final String AES_CBC_PADDING = "AES/CBC/PKCS5Padding";

public static String decrypt(String data, String key) throws Exception {
    return new String(decrypt(Base64.decodeBase64(data), Base64.decodeBase64(key)), "UTF-8");
}

private static byte[] decrypt(byte[] data, byte[] key) throws Exception{
    Key k = new SecretKeySpec(key, KEY_ALGORITHM);
    IvParameterSpec iv = new IvParameterSpec(IV.getBytes());
    Cipher cipher = Cipher.getInstance(AES_CBC_PADDING);
    cipher.init(Cipher.DECRYPT_MODE, k, iv);
    return cipher.doFinal(data);
}

php 该如何加密呢?

问题也许在于你用的 base64 编码，byte[] 转字符串或字符串转 byte[] 时。如果这样，PHP 也要同等用 base64 endcode/decode。PHP 方面注意 OPENSSL_ZERO_PADDING/OPENSSL_RAW_DATA 模式。