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infoWordPress Core•codePHPmemorymemory_limitwarningwarninghistorydeprecatedinsert_drive_filefile_missing•labelCommon•check_circleEasy

PHP Warning

A PHP Warning is a non‑fatal message generated by the PHP interpreter. WordPress displays the warning when code encounters a condition that does not stop execution.

You will see the warning when a function is deprecated, a file is missing, arguments are incorrect, memory limits are reached, or server settings expose warnings. The message includes the file path and line number, helping you locate the source.

Symptoms

[dashicons-warning]
Warning text on page
The warning appears in the page output, breaking layout or showing raw text.
[dashicons-admin-tools]
Blank space in layout
HTML stops where warning string inserts, leaving empty area.
[dashicons-email]
Email alert from monitoring
Your monitoring service sends an email that contains the warning line.

Common Causes

Deprecated function
Code calls a function removed in the current PHP version, triggering a warning.
Missing file
include or require cannot locate the specified file, PHP raises a warning.
Incorrect arguments
Function receives wrong type or number of parameters, PHP emits a warning.
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