3v4l.org

run code in 300+ PHP versions simultaneously
<?php function string_shift_left($input, $inputlen, $bits, &$output = null) { $skip = (int) ($bits / 8); $copylen = (int) ($inputlen - $skip); $offset = ($bits % 8) & 0xff; $mask = ~(0xff >> $offset) & 0xff; $output = str_pad('', $inputlen + 1, "\x00"); echo "$skip $copylen $offset $mask\n"; if ($offset == 0) { /* Shifting multiples of 8 allows us to simply copy the relevant bytes */ for ($i = 0; $i < $copylen; $i++) { $output[$i] = $input[$i + $skip]; } return; } for ($i = 0; $i < $copylen; $i++) { $left = (ord($input[$i + $skip]) << $offset) & 0xff; $right = (ord($input[$i + $skip + 1]) & $mask) >> (8 - $offset); printf("%08b %08b\n", $left, $right); $output[$i] = chr(($left | $right) & 0xff); } } function string_shift_right($input, $inputlen, $bits, &$output = null) { $skip = (int) ($bits / 8); $copylen = (int) ($inputlen - $skip); $offsetr = ($bits % 8) & 0xff; $signbits = (ord($input[0]) & 0x80) == 0 ? 0 : 255; echo "$skip $copylen $offsetr $signbits\n"; $output = str_pad('', $inputlen + 1, "\x00"); for ($i = 0; $i < $skip; $i++) { $output[$i] = chr($signbits); } if ($offsetr == 0) { /* Shifting multiples of 8 allows us to simply copy the relevant bytes */ for ($i = $skip, $l = $i + $copylen; $i < $l; $i++) { $output[$i] = $input[$i - $skip]; } return; } $offsetl = 8 - $offsetr; $mask = ~(0xff >> $offsetr) & 0xff; $output[$skip] = chr(($signbits & ~(0xff >> $offsetl)) | (ord($input[0]) >> $offsetl)); for ($i = $skip + 1, $l = $skip + $copylen; $i < $l; $i++) { $left = ((ord($input[$i - $skip]) & $mask) >> $offsetr); $right = (ord($input[($i - $skip) + 1]) << $offsetl); printf("%08b %08b\n", $left, $right); $output[$i] = chr($left | $right); } /* for ($i = 0; $i < $copylen; $i++) { $left = (ord($input[$i + $skip]) << $offset) & 0xff; $right = (ord($input[$i + $skip + 1]) & $mask) >> (8 - $offset); printf("%08b %08b\n", $left, $right); $output[$i] = chr(($left | $right) & 0xff); } */ } $input = "abc\x00"; $bits = 4; string_shift_right($input, strlen($input) - 1, $bits, $output); for ($i = 0; $i < strlen($input); $i++) { printf("\n%02x: %08b", ord($input[$i]), ord($input[$i])); } for ($i = 0; $i < strlen($output); $i++) { printf("\n%02x: %08b", ord($output[$i]), ord($output[$i])); }
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
0 3 4 0 00000110 11000110000 00000110 00000000 61: 01100001 62: 01100010 63: 01100011 00: 00000000 06: 00000110 36: 00110110 06: 00000110 00: 00000000
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected '=', expecting ')' in /in/AFD0O on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1
Parse error: parse error, unexpected '=', expecting ')' in /in/AFD0O on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `')'' in /in/AFD0O on line 3
Process exited with code 255.

preferences:
224.01 ms | 401 KiB | 367 Q