To enable/disable for error message in php.ini file

Enable:
display_errors = on
Disable:
display_errors = off

To modify the maximum number of input variables for PHP scripts in php.ini directives

To modify the maximum number of input variables for PHP scripts in php.ini directives
max_input_vars = 1500

To change the memory limit for PHP in php.ini directives

To change for this in php.ini
memory_limit = 256M

To set the PHP error log location in php.ini directives

PHP error log location in php.ini file
Enable:
error_log = /path/filename
Disable
;error_log = /path/filename

To change the PHP time zone setting in php.ini directives

To change the PHP time zone setting in php.ini file
date.timezone = "Europe/Paris"

To change the maximum upload file size for PHP in php.ini directives

In php.ini file change below this,
upload_max_filesize = 20M
post_max_size = 21M

To change execution time in php.ini directives

In php page change execution tin in php.ini file max_execution_time = 100;