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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); $offset = 8 - ($bits % 8); $mask = 0xff >> $offset; var_dump($skip, $copylen, $offset, $mask); $output = str_pad('', $inputlen + 1, "\x00"); if ($offset == 8) { /* 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++) { $output[$i] = chr((ord($input[$i + $skip]) << $offset) | (ord($input[$i + $skip + 1]) & $mask)); } } string_shift_left("\x01", 1, 3, $output); for ($i = 0; $i < strlen($output); $i++) { printf('%08b', ord($output[$i])); }
Output for 5.2.10 - 7.1.0
int(0) int(1) int(5) int(7) Notice: Uninitialized string offset: 1 in /in/RU9Qq on line 23 0010000000000000
Output for 5.0.0 - 5.2.9
int(0) int(1) int(5) int(7) Notice: Uninitialized string offset: 1 in /in/RU9Qq on line 23 0010000000000000
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected '=', expecting ')' in /in/RU9Qq 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/RU9Qq on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `')'' in /in/RU9Qq on line 3
Process exited with code 255.