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run code in 150+ php & hhvm versions
Bugs & Features
<?php function string_shift_left($input, $inputlen, $bits, &$output = null) { $skip = (int) ($bits / 8); $copylen = (int) ($inputlen - $skip); $offset = ($bits % 8) & 0xff; $mask = ~(0xff >> (8 - $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); $right = (ord($input[$i + $skip + 1]) & $mask) >> $offset; printf("%02x ", $left | $right); $output[$i] = chr($left | $right); } } //0b000100010001000100000000; $input = "abc\x00"; $bits = 2; string_shift_left($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 - 7.1.0
0 3 2 252 19c 198 18c 61: 01100001 62: 01100010 63: 01100011 00: 00000000 9c: 10011100 98: 10011000 8c: 10001100 00: 00000000
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected '=', expecting ')' in /in/oXBlQ on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected '=', expecting ')' in /in/oXBlQ on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `')'' in /in/oXBlQ on line 3
Process exited with code 255.