Added test for bug #51353. It'll be skipped by default and must be

activated manually.

ext/zip/tests/bug51353.phpt

@@ -0,0 +1,54 @@
+--TEST--
+Bug #51353 ZIP64 problem, archive with 100000 items
+--SKIPIF--
+<?php
+if(!extension_loaded('zip')) die('skip');
+die('skip the test might get very long, activate it manually');
+--FILE--
+<?php
+/* This test might get very long depending on the mashine it's running on. Therefore
+adding an explicit skip, remove it to run this test. */
+set_time_limit(0);
+
+$base_path = dirname(__FILE__);
+
+/* Either we ship a file with 100000 entries which would be >12M big,
+	or create it dynamically. */
+$zip = new ZipArchive;
+$r = $zip->open("$base_path/51353.zip", ZIPARCHIVE::CREATE | ZIPARCHIVE::OVERWRITE);
+if ($r) {
+	for ($i = 0; $i < 100000; $i++) {
+		$zip->addFromString("$i.txt", '1');
+	}
+	$zip->close();
+} else {
+	die("failed");
+}
+
+$zip = new ZipArchive;
+$r = $zip->open("$base_path/51353.zip");
+if ($r) {
+	$zip->extractTo("$base_path/51353_unpack");
+	$zip->close();
+
+	$a = glob("$base_path/51353_unpack/*.txt");
+	echo count($a) . "\n";
+} else {
+	die("failed");
+}
+
+echo "OK";
+--CLEAN--
+<?php
+$base_path = dirname(__FILE__);
+
+unlink("$base_path/51353.zip");
+
+$a = glob("$base_path/51353_unpack/*.txt");
+foreach($a as $f) {
+	unlink($f);
+}
+rmdir("$base_path/51353_unpack");
+--EXPECT--
+100000
+OK