Merge branch 'PHP-7.4'

* PHP-7.4:
  Fix #79934: CRLF-only line in heredoc causes parsing error

Author: nikic

Zend/tests/bug79934.phpt

@@ -0,0 +1,29 @@
+--TEST--
+Bug #79934: CRLF-only line in heredoc causes parsing error
+--DESCRIPTION--
+This test covers different variations of whitespace-only lines in heredoc strings.
+These whitespace-only lines should be ignored when stripping indentation.
+--FILE--
+<?php
+// lines with only CRLF should not cause a parse error
+eval("\$s1 = <<<HEREDOC\r\n    a\r\n\r\n    b\r\n    HEREDOC;");
+var_dump(addcslashes($s1, "\r\n"));
+
+// lines with only a LF should not cause a parse error
+eval("\$s2 = <<<HEREDOC\n    a\n\n    b\n    HEREDOC;");
+var_dump(addcslashes($s2, "\n"));
+
+// lines with only a CR should not cause a parse error
+eval("\$s3 = <<<HEREDOC\r    a\r\r    b\r    HEREDOC;");
+var_dump(addcslashes($s3, "\r"));
+
+// lines with only whitespace should not cause a parse error
+eval("\$s4 = <<<HEREDOC\r    a\r\n  \r\n    b\r    HEREDOC;");
+var_dump(addcslashes($s4, "\n\r"));
+
+?>
+--EXPECT--
+string(10) "a\r\n\r\nb"
+string(6) "a\n\nb"
+string(6) "a\r\rb"
+string(10) "a\r\n\r\nb"

Zend/zend_language_scanner.l

@@ -1170,6 +1170,7 @@ static const char *next_newline(const char *str, const char *end, size_t *newlin
 	for (; str < end; str++) {
 		if (*str == '\r') {
 			*newline_len = str + 1 < end && *(str + 1) == '\n' ? 2 : 1;
+			return str;
 		} else if (*str == '\n') {
 			*newline_len = 1;
 			return str;