Add test for calling pinned FQN name to global

Author: Girgias

Zend/tests/autoloading/function/local_function_pinned-to_global.phpt

@@ -0,0 +1,25 @@
+--TEST--
+Fallback to global function should trigger autoloading only once per namespace.
+--FILE--
+<?php
+
+namespace Bar {
+    if ( function_exists('Foo\strlen') ) {
+        var_dump(\Foo\strlen('hello'));
+    }
+}
+namespace Foo {
+     var_dump(strlen('hello')); // triggers name pinning
+}
+namespace Bar {
+    if ( function_exists('Foo\strlen') ) {
+        echo '\Foo\strlen() was bound to global \strlen()', \PHP_EOL;
+        var_dump(\Foo\strlen('hello'));
+    }
+}
+
+?>
+--EXPECT--
+int(5)
+\Foo\strlen() was bound to global \strlen()
+int(5)