Fixed Bug #53629 (memory leak inside highlight_string()).

Zend/tests/bug53629.phpt

@@ -0,0 +1,31 @@
+--TEST--
+Bug #53629 (memory leak inside highlight_string())
+--FILE--
+<?php
+
+$str = '
+<?php
+class foo {
+    public $bar = <<<EOT
+bar
+    EOT;
+}
+?>
+';
+$str2 = '
+<?php
+var_dump(array(<<<EOD
+foobar!
+EOD
+));
+?>
+';
+
+highlight_string($str, true);
+highlight_string($str2, true);
+
+
+echo "Done\n";
+?>
+--EXPECT--
+Done

Zend/zend_language_scanner.l

@@ -218,6 +218,12 @@ ZEND_API void zend_restore_lexical_state(zend_lex_state *lex_state TSRMLS_DC)
 	SCNG(input_filter) = lex_state->input_filter;
 	SCNG(output_filter) = lex_state->output_filter;
 	SCNG(script_encoding) = lex_state->script_encoding;
+
+	if (CG(heredoc)) {
+		efree(CG(heredoc));
+		CG(heredoc) = NULL;
+		CG(heredoc_len) = 0;
+	}
 }
 
 ZEND_API void zend_destroy_file_handle(zend_file_handle *file_handle TSRMLS_DC)

Zend/zend_language_scanner_defs.h

@@ -1,4 +1,4 @@
-/* Generated by re2c 0.13.5 on Mon Dec 20 01:33:18 2010 */
+/* Generated by re2c 0.13.5 on Mon Jan  3 06:07:39 2011 */
 #line 3 "Zend/zend_language_scanner_defs.h"
 
 enum YYCONDTYPE {