[11.x] Fix PHP_MAXPATHLEN check for strings slightly smaller then PHP…

…_MAXPATHLEN (#51850)

* Fix `PHP_MAXPATHLEN` test

This test was incorrect because it does not take into account the paths that are prefixed in the FileViewFinder. This means that we have so far tested a path that is significantly longer than `PHP_MAXPATHLEN`. As we cannot reliably access the path, we approach `PHP_MAXPATHLEN` and test all file names from `PHP_MAXPATHLEN - 200` to `PHP_MAXPATHLEN + 1`.

* Fix `PHP_MAXPATHLEN` check

The previous test was wrong. In fact, `PHP_MAXPATHLEN` is not the maximum length of a file, but `PHP_MAXPATHLEN - 1`. This is checked internally in the PHP source code and if the file is PHP_MAXPATHLEN characters long or longer, the error is thrown in Open-Base-Dir [1].

The problem was incompletely fixed here: #50962

[1] https://github.com/php/php-src/blob/7c860628cd2bf11ee867bfb41b3fd0314c5177c5/main/fopen_wrappers.c#L301

src/Illuminate/View/FileViewFinder.php

@@ -130,7 +130,7 @@ protected function findInPaths($name, $paths)
             foreach ($this->getPossibleViewFiles($name) as $file) {
                 $viewPath = $path.'/'.$file;
 
-                if (strlen($viewPath) <= PHP_MAXPATHLEN && $this->files->exists($viewPath)) {
+                if (strlen($viewPath) < (PHP_MAXPATHLEN - 1) && $this->files->exists($viewPath)) {
                     return $viewPath;
                 }
             }

tests/Integration/View/BladeTest.php

@@ -43,11 +43,13 @@ public function test_rendering_blade_long_maxpathlen_string_with_exact_length()
             $this->assertNotFalse($iniSet, 'Could not set config for open_basedir.');
         }
 
-        $longString = str_repeat('x', PHP_MAXPATHLEN);
+        for ($i = PHP_MAXPATHLEN - 200; $i <= PHP_MAXPATHLEN + 1; $i++) {
+            $longString = str_repeat('x', $i);
 
-        $result = Blade::render($longString);
+            $result = Blade::render($longString);
 
-        $this->assertSame($longString, $result);
+            $this->assertSame($longString, $result);
+        }
     }
 
     public function test_rendering_blade_component_instance()