在Lumen中用tibonilab/pdf-lumen-bundle生成PDF遇弃用错误求助

Hey there, I’ve run into this exact issue before when working with older PDF libraries on modern PHP versions. Let’s break down what’s going on and how to fix it:

What’s Causing the Error? #

The tibonilab/pdf-lumen-bundle probably relies on an outdated version of a PDF generation library (like TCPDF) that still uses the __autoload() function. PHP 7.2+ deprecated this function in favor of spl_autoload_register(), which is why you’re seeing that warning pop up.

Solutions to Try #

1. Update the Bundle First

Start with the simplest fix: update the bundle to its latest version to see if the maintainer already patched this compatibility issue. Run this command in your project root:

composer update tibonilab/pdf-lumen-bundle

After updating, test your PDF generation again. If the error disappears, you’re good to go!

2. Manually Patch the Deprecated Function

If updating doesn’t resolve the issue, you’ll need to tweak the underlying PDF library’s code (note: this is a temporary fix—composer updates might overwrite it later):

• Locate the PDF library file in your vendor directory (usually vendor/tecnickcom/tcpdf/tcpdf.php if it’s using TCPDF).
• Find the __autoload() function in that file. It will look something like this:

  function __autoload($classname) {
      // Existing class loading logic here
  }
  

• Replace it with a spl_autoload_register() call wrapping the same logic:

  spl_autoload_register(function($classname) {
      // Copy the existing loading logic exactly here
  });
  

• Save the file and test your PDF generation again. The deprecation warning should no longer appear.

3. Switch to a Better-Maintained Library

If the tibonilab/pdf-lumen-bundle hasn’t been updated in a while, it might be time to switch to a library that’s actively maintained for modern PHP versions:

• barryvdh/laravel-dompdf: Works seamlessly with Lumen (you’ll just need to register the service provider manually). It uses Dompdf, which is fully compatible with PHP 7.2+.
• tecnickcom/tcpdf: Use the latest version directly (without the bundle) and create a simple service provider in Lumen to wrap it. This gives you full control over the library version.

Pro Tips #

• If you go the manual patch route, use the cweagans/composer-patches plugin to create a persistent patch. This way, your changes won’t get overwritten when you run composer update.
• Double-check your PHP version matches the requirements for your Lumen version—Lumen 5.8+ requires PHP 7.2 or higher, which is where this deprecation was introduced.

内容的提问来源于stack exchange，提问作者Boominathan