ScopeIndentSniff causes errors when encountering an unmatched parenthesis

[XeroXer]

This is a bug i noticed when running SublimeLinter-phpcs, which copies the content of the current file to a temporary file and runs phpcs on that temporary file.
My CPU went to 100% and freezed my computer, and after digging through the logs I found the problem.

This code:

<?php
/*
$a = array(
    */
);

I know the code is wrong and will trigger syntax errors, but it will also freeze up phpcs.
It will print two errors forever:

PHP Notice:  Undefined index:  in .../PHP_CodeSniffer/CodeSniffer/File.php on line 3431
PHP Notice:  Undefined index:  in .../PHP_CodeSniffer/CodeSniffer/File.php on line 3443

On similar code such as:

<?php
/*
$a = [
    */
];

and:

<?php
/*
if (true) {
    */
}

the checking will work as expected on. So without really checking the source it seems the parentheses triggers the problem.

PHP_CodeSniffer might not be meant as a way to check error code but should using it on a file with syntax errors not work, I don't know.
Might need to rethink using the plugin in that case, just thought I'd report this.

EDIT
Changed line 3430 from:
for ($i = $start; $i >= 0; $i--) {
to:
for ($i = (int) $start; $i >= 0; $i--) {
will end the infinite loop, but not solve the problem fully.
Checking the $start variable shows it being null, which created the infinite loop. Forcing it to an integer instead goes through the code, shows the errors but triggers other notices.

PHP Notice:  Undefined index: parenthesis_opener in .../PHP_CodeSniffer/CodeSniffer/Standards/Generic/Sniffs/WhiteSpace/ScopeIndentSniff.php on line 226
PHP Notice:  Undefined index:  in .../PHP_CodeSniffer/CodeSniffer/File.php on line 3431

[gsherwood]

Wherever possible, I like PHPCS to be able to recover from a parse error. I've fixed this problem in the ScopeIndent sniff - it was always assuming parenthesis were matched.

Thanks for reporting it.