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A website hosted in Plesk shows the warning: Use of undefined constant SOME_CONSTANT - assumed 'SOME_CONSTANT' (this will throw an Error in a future version of PHP)

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Kuzma Ivanov
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Plesk for Linux kb: technical ABT: Group A

Applicable to:

  • Plesk for Linux

Symptoms

A website hosted in Plesk shows the following warning:

PLESK_INFO: Warning: Use of undefined constant SOME_CONSTANT - assumed 'SOME_CONSTANT' (this will throw an Error in a future version of PHP) in /var/www/vhosts/example.com/httpdocs/wp-content/themes/houzez-child/functions.php on line 73

Cause

The website is not compatible with the selected PHP version.

Resolution

  1. Log in to Plesk.

  2. Go to Domains > example.com > PHP Settings and change PHP version to an older one.

  3. Apply the changes.

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