See http://bugs.php.net/20175

diff --git a/tests/lang/bug20175.phpt b/tests/lang/bug20175.phpt
new file mode 100644 (file)
index 0000000..3b54dfd
--- /dev/null
+++ b/tests/lang/bug20175.phpt
@@ -0,0 +1,85 @@
+--TEST--
+Bug #20175 (Static vars can't store ref to new instance)
+--FILE--
+<?php
+/* Part 1:
+ * Storing the result of a function in a static variable.
+ * foo_global() increments global variable $foo_count whenever it is executed.
+ * When foo_static() is called it checks for the static variable $foo_value
+ * being initialised. In case initialisation is necessary foo_global() will be
+ * called. Since that must happen only once the return value should be equal.
+ */
+$foo_count = 0;
+
+function foo_global() {
+       global $foo_count;
+       return 'foo:' . ++$foo_count;
+}
+
+function foo_static() {
+       static $foo_value;
+       if (!isset($foo_value)) {
+               $foo_value = foo_global();
+       }
+       return $foo_value;
+}
+
+/* Part 2:
+ * Storing a reference to the result of a function in a static variable.
+ * Same as Part 1 but:
+ * The return statment transports a copy of the value to return. In other 
+ * words the return value of bar_global() is a temporary variable only valid
+ * after the function call bar_global() is done in current local scope.
+ */
+$bar_global = 0;
+
+function bar_global() {
+       global $bar_count;
+       return 'bar:' . ++$bar_count;
+}
+
+function bar_static() {
+       static $bar_value;
+       if (!isset($bar_value)) {
+               $bar_value = &bar_global();
+       }
+       return $bar_value;
+}
+
+/* Part 3:
+ * Storing a reference to the result of a function in a static variable.
+ * Same as Part 2 but wow_global() returns a reference.
+ */
+$wow_global = 0;
+$wow_name = '';
+
+function &wow_global() {
+       global $wow_count, $wow_name;
+       $wow_name = 'wow:' . ++$wow_count;
+       return $wow_name;
+}
+
+function wow_static() {
+       static $wow_value;
+       if (!isset($wow_value)) {
+               $wow_value = &wow_global();
+       }
+       return $wow_value;
+}
+
+print zend_version()."\n";
+print foo_static()."\n";
+print foo_static()."\n";
+print bar_static()."\n";
+print bar_static()."\n";
+print wow_static()."\n";
+print wow_static()."\n";
+?>
+--EXPECTF--
+%s
+foo:1
+foo:1
+bar:1
+bar:2
+wow:1
+wow:1