Php/docs/openssl.constants.other

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Other Constants

OPENSSL_ZERO_PADDING (bool)

By default encryption operations are padded using standard block padding and the padding is checked and removed when decrypting. If OPENSSL_ZERO_PADDING is set in the openssl_encrypt() or openssl_decrypt() options then no padding is performed, the total amount of data encrypted or decrypted must then be a multiple of the block size or an error will occur.