Prism.languages.insertBefore('php', 'variable', {
	'this': /\$this/,
	'global': /\$_?(GLOBALS|SERVER|GET|POST|FILES|REQUEST|SESSION|ENV|COOKIE|HTTP_RAW_POST_DATA|argc|argv|php_errormsg|http_response_header)/,
	'scope': {
		pattern: /\b[\w\\]+::/,
		inside: {
			keyword: /(static|self|parent)/,
			punctuation: /(::|\\)/
		}
	}
});