Test php segfault for segfault.css from https://gist.github.com/alexanderschnitzler/8cb16ea541e35888884d

test-segfault-css.php

<?php

define('CR', chr(13));

class ResourceCompressor {

	/**
	 * Callback function for preg_replace
	 *
	 * @see compressCssFile
	 * @param array $matches
	 * @return string the compressed string
	 */
	static public function compressCssPregCallback($matches) {
		if ($matches[1]) {
			// Group 1: Double quoted string.
			return $matches[1];
		} elseif ($matches[2]) {
			// Group 2: Single quoted string.
			return $matches[2];
		} elseif ($matches[3]) {
			// Group 3: Regular non-MacIE5-hack comment.
			return '
';
		} elseif ($matches[4]) {
			// Group 4: MacIE5-hack-type-1 comment.
			return '
/*\\T1*/
';
		} elseif ($matches[5]) {
			// Group 5,6,7: MacIE5-hack-type-2 comment
			$matches[6] = preg_replace('/\\s++([+>{};,)])/S', '$1', $matches[6]);
			// Clean pre-punctuation.
			$matches[6] = preg_replace('/([+>{}:;,(])\\s++/S', '$1', $matches[6]);
			// Clean post-punctuation.
			$matches[6] = preg_replace('/;?\\}/S', '}
', $matches[6]);
			// Add a touch of formatting.
			return '
/*T2\\*/' . $matches[6] . '
/*T2E*/
';
		} elseif ($matches[8]) {
			// Group 8: calc function (see http://www.w3.org/TR/2006/WD-css3-values-20060919/#calc)
			return 'calc' . $matches[8];
		} elseif (isset($matches[9])) {
			// Group 9: Non-string, non-comment. Safe to clean whitespace here.
			$matches[9] = preg_replace('/^\\s++/', '', $matches[9]);
			// Strip all leading whitespace.
			$matches[9] = preg_replace('/\\s++$/', '', $matches[9]);
			// Strip all trailing whitespace.
			$matches[9] = preg_replace('/\\s{2,}+/', ' ', $matches[9]);
			// Consolidate multiple whitespace.
			$matches[9] = preg_replace('/\\s++([+>{};,)])/S', '$1', $matches[9]);
			// Clean pre-punctuation.
			$matches[9] = preg_replace('/([+>{}:;,(])\\s++/S', '$1', $matches[9]);
			// Clean post-punctuation.
			$matches[9] = preg_replace('/;?\\}/S', '}
', $matches[9]);
			// Add a touch of formatting.
			return $matches[9];
		}
		return $matches[0] . '
/* ERROR! Unexpected _proccess_css_minify() parameter */
';
	}


	/**
	 * Compress a CSS string by removing comments and whitespace characters
	 *
	 * @param string $contents
	 * @return string
	 */
	static public function compressCssString($contents) {
		// Perform some safe CSS optimizations.
		$contents = str_replace(CR, '', $contents);
		// Strip any and all carriage returns.
		// Match and process strings, comments and everything else, one chunk at a time.
		// To understand this regex, read: "Mastering Regular Expressions 3rd Edition" chapter 6.
		$contents = preg_replace_callback('%
				# One-regex-to-rule-them-all! - version: 20100220_0100
				# Group 1: Match a double quoted string.
				("[^"\\\\]*+(?:\\\\.[^"\\\\]*+)*+") |  # or...
				# Group 2: Match a single quoted string.
				(\'[^\'\\\\]*+(?:\\\\.[^\'\\\\]*+)*+\') |  # or...
				# Group 3: Match a regular non-MacIE5-hack comment.
				(/\\*[^\\\\*]*+\\*++(?:[^\\\\*/][^\\\\*]*+\\*++)*+/) |  # or...
				# Group 4: Match a MacIE5-type1 comment.
				(/\\*(?:[^*\\\\]*+\\**+(?!/))*+\\\\[^*]*+\\*++(?:[^*/][^*]*+\\*++)*+/(?<!\\\\\\*/)) |  # or...
				# Group 5: Match a MacIE5-type2 comment.
				(/\\*[^*]*\\*+(?:[^/*][^*]*\\*+)*/(?<=\\\\\\*/))  # folllowed by...
				# Group 6: Match everything up to final closing regular comment
				([^/]*+(?:(?!\\*)/[^/]*+)*?)
				# Group 7: Match final closing regular comment
				(/\\*[^/]++(?:(?<!\\*)/(?!\\*)[^/]*+)*+/(?<=(?<!\\\\)\\*/)) |  # or...
				# Group 8: Match a calc function (see http://www.w3.org/TR/2006/WD-css3-values-20060919/#calc)
				(?:calc(\\((?:(?:[^\\(\\)]+)|(?8))*+\\))) | # or...
				# Group 9: Match regular non-string, non-comment text.
				((?:[^"\'/](?!calc))*+(?:(?!/\\*)/(?:[^"\'/](?!calc))*+)*+)
				%Ssx', array('self', 'compressCssPregCallback'), $contents);
		// Do it!
		$contents = preg_replace('/^\\s++/', '', $contents);
		// Strip leading whitespace.
		$contents = preg_replace('/[ \\t]*+\\n\\s*+/S', '
', $contents);
		// Consolidate multi-lines space.
		$contents = preg_replace('/(?<!\\s)\\s*+$/S', '
', $contents);

		return $contents;
	}
	
}

ResourceCompressor::compressCssString(file_get_contents('segfault.css'));