From 70e1851a22a2789e99d111b48ceb3710d707419e Mon Sep 17 00:00:00 2001
From: Ilia Alshanetsky <ilia@ilia.ws>
Date: Sat, 18 Apr 2026 08:10:44 -0400
Subject: [PATCH] phar: restore is_link handler in
 phar_intercept_functions_shutdown

phar_intercept_functions_init hooks 22 built-in functions via
PHAR_INTERCEPT. phar_intercept_functions_shutdown restores all of them
via PHAR_RELEASE except is_link, which was simply missing from the list.

On MSHUTDOWN the is_link entry in CG(function_table) retains the phar
intercept handler. In a persistent SAPI, if the module is reloaded, the
second MINIT saves PHP_FN(phar_is_link) as orig_is_link, and any
subsequent is_link() call recurses infinitely.
---
 ext/phar/func_interceptors.c               |  1 +
 ext/phar/tests/phar-is-link-intercept.phpt | 30 ++++++++++++++++++++++
 2 files changed, 31 insertions(+)
 create mode 100644 ext/phar/tests/phar-is-link-intercept.phpt

diff --git a/ext/phar/func_interceptors.c b/ext/phar/func_interceptors.c
index f1b2b0eba1e6..9d83f740d501 100644
--- a/ext/phar/func_interceptors.c
+++ b/ext/phar/func_interceptors.c
@@ -932,6 +932,7 @@ void phar_intercept_functions_shutdown(void)
 	PHAR_RELEASE(fopen);
 	PHAR_RELEASE(file_get_contents);
 	PHAR_RELEASE(is_file);
+	PHAR_RELEASE(is_link);
 	PHAR_RELEASE(is_dir);
 	PHAR_RELEASE(opendir);
 	PHAR_RELEASE(file_exists);
diff --git a/ext/phar/tests/phar-is-link-intercept.phpt b/ext/phar/tests/phar-is-link-intercept.phpt
new file mode 100644
index 000000000000..378e9ef375d1
--- /dev/null
+++ b/ext/phar/tests/phar-is-link-intercept.phpt
@@ -0,0 +1,30 @@
+--TEST--
+phar: is_link() intercept correctly delegates for non-symlink phar entries
+--EXTENSIONS--
+phar
+--SKIPIF--
+<?php if (defined('PHP_WINDOWS_VERSION_MAJOR')) die("skip"); ?>
+--INI--
+phar.readonly=0
+phar.require_hash=0
+--FILE--
+<?php
+$fname = __DIR__ . '/' . basename(__FILE__, '.php') . '.phar';
+$phar = new Phar($fname);
+$phar->addFromString('file.txt', 'hello');
+$phar->setStub('<?php
+Phar::interceptFileFuncs();
+// relative path resolves via phar intercept
+var_dump(is_link("file.txt"));       // false: regular entry, not a symlink
+var_dump(is_link("nonexistent.txt")); // false: missing entry
+// absolute phar:// path bypasses the relative-path intercept, goes to orig_is_link
+var_dump(is_link("phar://" . __FILE__ . "/file.txt")); // false: phar entries are never OS symlinks
+__HALT_COMPILER(); ?>');
+include $fname;
+?>
+--CLEAN--
+<?php @unlink(__DIR__ . '/' . basename(__FILE__, '.clean.php') . '.phar'); ?>
+--EXPECT--
+bool(false)
+bool(false)
+bool(false)