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[2019-12-23 22:24 UTC] mech at themech dot net
Description:
------------
I noticed this issue while debugging Koseven framework with PHP 7.4. It is related to class autoloading.
Imagine there is an autoloader function registered with the following code inside:
if (class_exists('B', False)) {
new B();
}
If class B extends some other class A and autoloading function is called to load class A then class_exists('B', false) returns true even if B is not "fully loaded" as its parent class A is still to be loaded. So under PHP 7.4 the "new B()" is being executed and throws "Fatal error: Uncaught Error: Class 'B' not found".
The same code works with PHP 7.3
Test script:
---------------
<?php
// classes/Foo.php: class Foo extends Bar {}
// classes/Bar.php: class Bar {}
function my_autoloader($class) {
if (class_exists('Foo', False)) {
new Foo();
}
if ($class == 'Foo' or $class == 'Bar') {
include "classes/$class.php";
}
}
spl_autoload_register('my_autoloader');
new Foo();
echo "end"
Expected result:
----------------
class_exists should not return true for the class that does not exist yet.atal
Actual result:
--------------
Fatal error, class not found.
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Last updated: Wed Oct 29 23:00:01 2025 UTC |
> gc '.\test script.php' <?php function my_autoloader($class) { if (class_exists('Foo', False)) { new Foo(); } if ($class == 'Foo' or $class == 'Bar') { include_once "classes/$class.php"; } } spl_autoload_register('my_autoloader'); new Foo(); echo "end"; --- --- > gci | ft FullName FullName -------- D:\repro bug 79022\classes D:\repro bug 79022\test script.php --- --- > gc .\classes\Bar.php <?php class Bar {} > gc .\classes\Foo.php <?php include_once "Bar.php"; class Foo extends Bar {} --- --- works for me on Windows 10 1909. with above code and files. tested by typing >php.exe "test script.php" and >php.exe -f "test script.php" > php -v PHP 7.4.2 (cli) (built: Jan 21 2020 17:53:48) ( ZTS Visual C++ 2017 x86 ) Copyright (c) The PHP Group Zend Engine v3.4.0, Copyright (c) Zend Technologies about comment formatting: I don't know how to format it. See https://pastebin.com/QHzw60Dg for colored output. the paste expires in 364 days. to see raw paste content https://pastebin.com/raw/QHzw60Dg --- --- aside: To repeat a message I thought was unexpected uncomment the include_once "Bar.php" line in Foo.php file. Then type > php .\classes\Foo.php PHP Fatal error: Uncaught Error: Class 'Bar' not found in D:\repro bug 79022\classes\Foo.php:4 Stack trace: #0 {main} thrown in D:\repro bug 79022\classes\Foo.php on line 4 Fatal error: Uncaught Error: Class 'Bar' not found in D:\repro bug 79022\classes\Foo.php:4 Stack trace: #0 {main} thrown in D:\repro bug 79022\classes\Foo.php on line 4 It is a bit weird that the exact same error is printed twice. And now, more weird stuff, note the include-once line is commented. > php -f '.\test script.php' end > php.exe -f .\classes\Bar.php > php.exe -f .\classes\Bar.php I think it's weird that the first command prints end and nothing else. When compared to how 'php -f Foo.php' is handled.