[ 0 => 'MHASH_MD5', 1 => 'apple',]
[ 'result' => [ 'string' => '8p\'OlIg(', 'hex' => '1f3870be274f6c49b3e31a0c6728957f', ], 'php_version' => '7.1.33 Linux x86_64',]
[ 0 => 'MHASH_MD5', 1 => 'apple', 2 => 'my special key',]
[ 'result' => [ 'string' => ';C[ɒcm!d\\N', 'hex' => 'df3b435b06ac88c992636d21645cdf4e', ], 'php_version' => '7.1.33 Linux x86_64',]