5 require __DIR__ . '/../vendor/autoload.php';
7 function canonicalize($str) {
9 $str = str_replace("\r\n", "\n", $str);
11 // trim newlines at end
12 $str = rtrim($str, "\n");
14 // remove trailing whitespace on all lines
15 $lines = explode("\n", $str);
16 $lines = array_map(function($line) {
17 return rtrim($line, " \t");
19 return implode("\n", $lines);