openssl_cipher_iv_length Gets the cipher iv length &reftitle.description; intopenssl_cipher_iv_length stringmethod Gets the cipher iv length. &reftitle.parameters; method The method. &reftitle.returnvalues; Returns the cipher length on success, or &false; on failure. &reftitle.errors; Emits an E_WARNING level error when the cipher algorithm is unknown. &reftitle.examples; ]]> &example.outputs.similar;