Tests: chdir() and open() for PHP module.

These tests ensure optimizations in the chdir calls don't break
SAPI semantics.

test/php/cwd/index.php

@@ -0,0 +1,19 @@
+<?php
+
+if (isset($_GET['chdir']) && $_GET['chdir'] != "") {
+    if (!chdir($_GET['chdir'])) {
+        echo "failure to chdir(" . $_GET['chdir'] . ")\n";
+        exit;
+    }
+}
+
+$opcache = -1;
+
+if (function_exists('opcache_get_status')) {
+    $opcache = opcache_get_status()->opcache_enabled;
+}
+
+header('X-OPcache: ' . $opcache);
+
+print(getcwd());
+?>

test/php/cwd/subdir/index.php

@@ -0,0 +1 @@
+<?php print(getcwd()); ?>

test/php/open/index.php

@@ -0,0 +1,7 @@
+<?php
+if (isset($_GET['chdir'])) {
+    chdir($_GET['chdir']);
+}
+
+echo file_get_contents('test.txt');
+?>

test/php/open/test.txt

@@ -0,0 +1 @@
+test