It is assumed that you are using Plesk as a Service Provider. If you are using Plesk as a Power User, switch to Service Provider:
To change PHP settings for one site:
memory_limit
 max_execution_time
 max_input_time
 post_max_size
 upload_max_filesize
 safe_mode 
 safe_mode_include_dir
 safe_mode_exec_dir
 include_path
 session.save_path
 mail.force_extra_parameters
 register_globals 
 open_basedir
 error_reporting
 display_errors 
 allow_url_fopen 
 file_uploads 
 short_open_tag 
 magic_quotes_gpc
											  Article ID: 78
											  Created On: Tue, Mar 3, 2015 at 5:24 PM
											  Last Updated On: Wed, Aug 18, 2021 at 2:08 PM
											  
											
Online URL: https://www.heartinternet.uk/support/article/how-do-i-change-the-php-settings-in-plesk-for-a-website-on-my-server.html