Merge branch 'PHP-5.6'

Conflicts:
	Zend/zend_compile.c

Zend/tests/bug67633.phpt

@@ -0,0 +1,44 @@
+--TEST--
+Bug #67633: A foreach on an array returned from a function not doing copy-on-write
+--FILE--
+<?php
+
+function id($x) {
+    return $x;
+}
+
+function &ref_id(&$x) {
+    return $x;
+}
+
+$c = 'c';
+$array = ['a', 'b', $c];
+
+foreach(id($array) as &$v) {
+    $v .= 'q';
+}
+var_dump($array);
+
+foreach(ref_id($array) as &$v) {
+    $v .= 'q';
+}
+var_dump($array);
+
+?>
+--EXPECT--
+array(3) {
+  [0]=>
+  string(1) "a"
+  [1]=>
+  string(1) "b"
+  [2]=>
+  string(1) "c"
+}
+array(3) {
+  [0]=>
+  string(2) "aq"
+  [1]=>
+  string(2) "bq"
+  [2]=>
+  &string(2) "cq"
+}

Zend/zend_compile.c

@@ -3413,6 +3413,10 @@ void zend_compile_foreach(zend_ast *ast TSRMLS_DC) /* {{{ */
 		zend_compile_expr(&expr_node, expr_ast TSRMLS_CC);
 	}
 
+	if (by_ref) {
+		zend_separate_if_call_and_write(&expr_node, expr_ast, BP_VAR_W TSRMLS_CC);
+	}
+
 	opnum_reset = get_next_op_number(CG(active_op_array));
 	opline = zend_emit_op(&reset_node, ZEND_FE_RESET, &expr_node, NULL TSRMLS_CC);
 	if (by_ref && is_variable) {