ext/session: Add test for session_start with read_and_close option (#13799)

ext/session/tests/session_start_read_and_close.phpt

@@ -0,0 +1,49 @@
+--TEST--
+Test session_start() with flag read_and_close
+--EXTENSIONS--
+session
+--SKIPIF--
+<?php include('skipif.inc'); ?>
+--FILE--
+<?php
+
+ob_start();
+
+$valuesEnablingReadAndClose = [true, 1, "1", "777", 777, -1];
+
+$valuesDisablingReadAndClose = ["true", false, "false", 0, "0", "no", "00000"];
+
+foreach ($valuesEnablingReadAndClose as $value) {
+    session_start(["read_and_close" => $value]);
+    var_dump(session_status() === PHP_SESSION_NONE);
+}
+
+foreach ($valuesDisablingReadAndClose as $value) {
+    session_start(["read_and_close" => $value]);
+    var_dump(session_status() === PHP_SESSION_ACTIVE);
+    session_write_close();
+}
+
+try {
+    session_start(["read_and_close" => 1.0]);
+} catch (Throwable $e) {
+    echo $e::class, ': ', $e->getMessage(), PHP_EOL;
+}
+
+ob_end_flush();
+?>
+--EXPECTF--
+bool(true)
+bool(true)
+bool(true)
+bool(true)
+bool(true)
+bool(true)
+bool(true)
+bool(true)
+bool(true)
+bool(true)
+bool(true)
+bool(true)
+bool(true)
+TypeError: session_start(): Option "read_and_close" must be of type string|int|bool, float given