PHP – Autoloader Crashing When Model File Does Not Exist

🔴 Error

Autoloader requires a file that may not exist
❌ Before (broken):

spl_autoload_register(function($classname){
require $filename = “../app/models/”.ucfirst($classname).”.php”;
});

What’s wrong: require will crash the entire application if the file doesn’t exist. When PHP tries to autoload a class that has no model file (like the built-in PDO class), it will throw a fatal error immediately.

✅ After (fixed):

spl_autoload_register(function($classname){
// Use require_once only if the file actually exists, to prevent fatal crashes
$filename = “../app/models/”.ucfirst($classname).”.php”;
if(file_exists($filename)){
require_once $filename;
}
});

Why it’s fixed: Checking with file_exists() first means the autoloader only loads files that are actually there, and silently skips anything else — no crash.