What PHP Errors are and why they matter #
PHP is the programming language your WordPress site runs on. Every time someone loads a page, submits a form, or places an order, PHP is executing code on your server to make that happen. When something goes wrong in that code, PHP produces an error. That error might crash the page visibly, produce a white screen, corrupt the output silently, or leave no trace at all on the front end while quietly preventing something from working.
PHP Errors are 1 of the most reliable signals Loupely captures for diagnosing WordPress failures. They tell you exactly what broke, in which file, and on which line. The problem for most non-technical site owners is that PHP error messages are written for developers, not for people trying to understand why their checkout isn’t working.
Loupely captures PHP Errors and translates them into what they actually mean for your site.
The 4 error types Loupely captures #
Fatal Errors #
A fatal error means PHP hit a problem it couldn’t recover from and stopped executing the script entirely. Your page may show a white screen, a generic “there has been a critical error” message, or nothing at all. Fatal Errors always indicate something broken that needs to be fixed before the affected functionality will work. The most common causes: a plugin or theme using a function that doesn’t exist (often after an update to WordPress Core that removed a deprecated function), a PHP version incompatibility where a plugin requires PHP 8.x features but your server is running 7.x, or a corrupted plugin file.
Warnings #
A warning means PHP encountered a problem but didn’t stop executing. Your page probably loaded, but something may be working incorrectly or incompletely. Warnings don’t break your site on their own, but they often indicate that a plugin or theme is doing something it shouldn’t, and they can escalate to Fatal Errors after updates. Loupely flags warnings in the capture because they frequently appear alongside the actual cause of a visible failure.
Notices #
A notice is the lowest-severity PHP message. It means the code did something that technically worked but isn’t best practice: accessing a variable that might not exist, using a deprecated function, or similar. Notices rarely cause visible failures on their own. Loupely captures them but generally doesn’t surface them in the diagnosis unless they’re part of a pattern that suggests a larger problem.
Deprecated notices #
A deprecated notice means a plugin or theme is using a function that WordPress or PHP has marked for removal in a future version. It works now, but it won’t after the next major update. Loupely surfaces deprecated notices when they’re relevant to a current failure or when the deprecation schedule means breakage is imminent.
How Loupely captures PHP Errors without WP_DEBUG #
Normally, to see PHP Errors on a WordPress site, you need to enable WP_DEBUG in your wp-config.php file, which requires editing a core WordPress configuration file directly. Most non-technical site owners can’t do this safely, and hosting providers often restrict it.
Loupely’s WordPress Plugin captures PHP Errors through a separate instrumentation layer that doesn’t require WP_DEBUG to be enabled. When you click Run Diagnosis, the plugin reads the current PHP error state and includes it in the server-side capture. You get the diagnostic value of the PHP error log without needing to enable debug mode, know where the log file lives, or read raw PHP error output.
What Loupely does with PHP Errors in a diagnosis #
When a PHP error is part of the capture, Loupely’s correlation rules check whether it’s causally connected to the failure you’re experiencing. A fatal error in a WooCommerce plugin file during a checkout attempt is much more significant than a notice from an unrelated plugin firing in the background. The diagnosis names the relevant error, explains what it means in terms of what broke, and routes the triage accordingly: usually a rollback if the error appeared after an update, a developer handoff if the error is in custom code, or a hosting escalation if the error reflects a server configuration problem.