WordPress Basics Snippets

WordPress Some Basic Snippets

1) is_admin() check and AJAX Call
=================================
// Is admin, but not doing ajaax
if( is_admin() && ( ! defined( 'DOING_AJAX' ) || ! DOING_AJAX ) ) {
    require_once('admin/functions_admin.php'); 
}
// Is doing AJAX 
else if ( is_admin() && ( defined( 'DOING_AJAX' ) || DOING_AJAX ) ) {
    require_once('functions_ajax.php'); 
}
// Front-end functions
else { 
require_once('public/functions_public.php'); 
}

2) WordPress debugging:
=======================
// To enable debug mode.
define('WP_DEBUG', true);

// To enable the debug logging to debug.log file in wp-content/
define('WP_DEBUG_LOG', true);

// To disable the display of errors and warnings
define('WP_DEBUG_DISPLAY', false);

// To enable the development version of css and js file
define('SCRIPT_DEBUG', true);

3)How to generate the POT file:
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Create a POT file for the WordPress plugin/theme in the current directory
$ wp i18n make-pot . languages/my-plugin.pot

4) How to increase Max input var 
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Change the php.ini max_input_vars parameter to desired value.
max_input_vars =3000

Or Set using .htaccess file.
php_value max_input_vars 3000

or Set using wp-config directives.
@ini_set( 'max_input_vars' , 4000 );

5) How to increase upload max size:
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You can change the upload max size in three way.
By modifying the php.ini file.

upload_max_filesize = 128M
post_max_size = 128M
max_execution_time = 300

Or 
By modifying the .htaccess file.
php_value upload_max_filesize 128M
php_value post_max_size 128M
php_value max_execution_time 300
php_value max_input_time 300

Or by using the php ini directives in theme functions.php or wp-config.php.
@ini_set( 'upload_max_size' , '128M' );
@ini_set( 'post_max_size', '128M');
@ini_set( 'memory_limit', '256M' );