Fix bug #66660: use str_efree instead of efree to handle interned empty strings correctly

NEWS

@@ -8,6 +8,7 @@ PHP                                                                        NEWS
     to complete the set; now possible thanks to bug #66015 being fixed. (Bob)
   . Fixed bug #66568 (Update reflection information for unserialize() function).
     (Ferenc)
+  . Fixed bug #66660 (Composer.phar install/update fails). (Ferenc)
 
 - mysqlnd:
   . Added a new fetching mode to mysqlnd. (Andrey)

Zend/tests/bug66660.phpt

@@ -0,0 +1,13 @@
+--TEST--
+Bug #66660 (Composer.phar install/update fails)
+--STDIN--
+<?php __CLASS__ ?>
+--FILE--
+<?php
+file_put_contents(__DIR__."/bug66660.tmp.php", "<?php __CLASS__ ?>");
+echo php_strip_whitespace(__DIR__."/bug66660.tmp.php");
+?>
+--CLEAN--
+<?php unlink(__DIR__."/bug66660.tmp.php"); ?>
+--EXPECT--
+<?php __CLASS__ ?>

Zend/zend_highlight.c

@@ -211,7 +211,7 @@ ZEND_API void zend_strip(TSRMLS_D)
 					break;
 
 				default:
-					efree(token.value.str.val);
+					STR_FREE(token.value.str.val);
 					break;
 			}
 		}