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PHP Fatal Error

A PHP fatal error stops WordPress execution instantly. The interpreter encounters an unrecoverable problem and aborts the request.

Typical triggers include undefined functions, memory exhaustion, mismatched PHP version, corrupted core files, or database calls made before WordPress loads. When the error appears the page returns no HTML or shows a plain error message.

Symptoms

[dashicons-warning]
White Screen of Death
A completely blank page appears, source code shows no markup.
[dashicons-admin-site]
Critical error notice
WordPress displays “There has been a critical error on this website.”
[dashicons-editor-code]
Fatal error line in browser
The browser shows a PHP message with file name and line number.

Common Causes

Plugin conflict
A plugin calls an undefined function or uses deprecated hooks.
Theme incompatibility
Errors in functions.php or missing template files cause the crash.
Memory limit exhaustion
Script exceeds the PHP memory_limit setting.
Incorrect PHP version
Server runs a version older than required by the code.
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