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WordPress PHP Errors Showing on Website
Troubleshooting WordPress CMS Stability

WordPress PHP Errors Showing on Website

Overview

PHP errors on a WordPress site range from notices that appear alongside normal content to fatal errors that take the entire site offline. Unlike debug mode messages, which require WP_DEBUG to be enabled, PHP fatal errors and parse errors will surface regardless of debug settings — often as a white screen, a partial page, or a raw error message visible to all visitors.

Types of PHP Errors

  • Fatal error — execution stops completely; page goes blank or shows an error message
  • Parse error / syntax error — a file contains invalid PHP syntax; affects all pages loading that file
  • Warning — non-fatal issue; page may still render but behaves incorrectly
  • Notice — minor issue flagged during execution; usually a deprecated function or undefined variable
  • White screen of death (WSOD) — fatal error with display suppressed; blank page, no visible message

Common Causes

  • a plugin or theme update introduced incompatible code
  • a manual edit to a PHP file introduced a syntax error
  • the server’s PHP version was upgraded and older code uses deprecated functions
  • a plugin uses a function removed in a newer version of WordPress or PHP
  • a corrupted file upload or failed partial install

How the Problem Appears

  • white screen on the front end or admin dashboard
  • error message containing a file path, line number, and function name
  • only certain pages affected, depending on which plugin or template file triggers the error
  • admin login broken, preventing access to fix the issue
  • error logged silently while the page shows blank — no visible error but no content either

How It Is Diagnosed

  • check the server error log (/wp-content/debug.log if logging is enabled, or the hosting control panel)
  • enable error logging without display: set WP_DEBUG true, WP_DEBUG_LOG true, WP_DEBUG_DISPLAY false in wp-config.php
  • identify the file and line number from the error message
  • deactivate recently updated or installed plugins via FTP or the database if admin access is broken
  • switch to a default theme (Twenty Twenty-Four) to rule out theme-level errors

Typical Fix

  • if a plugin caused the error: deactivate via FTP by renaming the plugin folder in wp-content/plugins/
  • if a theme file is broken: replace with a fresh copy from the theme developer or revert to a default theme
  • if a syntax error was introduced manually: correct the PHP syntax at the reported line number
  • if a PHP version mismatch: downgrade PHP in the hosting control panel to the version the site was running on, then update plugins to compatible versions
  • restore from a pre-error backup if the source of the error cannot be isolated

Technical Website Support

PHP errors on a live site require immediate attention — a white screen or broken admin means visitors cannot reach you and you cannot make changes. If the source of the error is not immediately clear, technical support can isolate and resolve it without data loss.