Elvin Haci

May 30, 2020

Quick trick – running wp-cli command via Cron Job

Today i faced strange issue with WP-Cli command.

I have simple php script (let’s call it task.php) which runs through Crontab. All blocks of main procedure were running OK except one. That one with

shell_exec("cd /var/www/appname;wp COMMAND_HERE");

Nothing special, just one line of simple shell command.

I run the script in SSH Console

cd /var/www/appname; php task.php

and everything works OK, included shell_exec line.

But same script behaves differently when it is called from cronjob.

After quick investigation i noticed that it was because of WP command.

In cronjob the system doesn’t recognize this command for some already known reasons for me.

That’s why i had to set full path of WP command. And it started working.

Thus, if you face such problem, just replate this

shell_exec("cd /var/www/appname;wp COMMAND_HERE");

with this

shell_exec("cd /var/www/appname; /usr/local/bin/wp COMMAND_HERE");

And it will start working OK.

March 30, 2020March 30, 2020

Restrict wp-admin access by IP – when you are using Cloudflare

Restricting your wp-admin access by using simple Apache’s .htaccess rules is easy, we know.

Just this rule and that’s all

<Files wp-login.php>
Order Deny,Allow
Deny from all
Allow from IP1
Allow from IP2 
#and so on
</Files>

But this would not work if you are using Cloudflare. Just because Cloudflare is middle layer between your website and your website visitor, and you get request with Cloudflare’s own IP-s, not clients’ IP-s.

In order to to lose this information about visitor IP, Cloudflare sends us real visitor’s IP as $_SERVER variable.

So, we just need to adjust our htaccess rule and pass $_SERVER variable there, instead of using IP addresses.

Here is simple htaccess code which works OK with Cloudflare:

SetEnvIF CF-Connecting-IP "SOMEIPHERE1" MyIP
SetEnvIF CF-Connecting-IP "SOMEIPHERE2" MyIP2
<Files wp-login.php>
Require env MyIP
Require env MyIP2
</Files>

That’s all. After saving this block to htaccess, your wp-admin would open for specified IP addresses only.

January 30, 2020January 30, 2020

Easy way to collect all SQL queries in WordPress – with and without SAVEQUERIES enabled

As we know WordPress has built in DB class called WPDB and all SQL queries should run via that class.

And in WordPress Debugging the only way to collect/debug executed SQL queries is activating debug constant called SAVEQUERIES.

And this constant forces WPDB to collect all SQL queries – but to display or save those queries we need to use some custom function.

Q: Where to run that function?

A: Usually it is recommended to add saving function to wp_footer hook – simply because wp_footer runs after most processes are finished. (and admin_footer for wp_admin)

But this is totally wrong! Why? Just because wp_footer runs in template side and doesn’t include some processes such as AJAX processes.

So we need to use another hook for that.

Here are 2 simple ways to catch all SQL queries of WPDB.

April 16, 2019April 16, 2019

Creating Custom Warnings and Conditions for Contact Form 7

The most Contact Form plugin for WordPress is Contact Form 7, indeed. It has very simple structure and shortcode logic. By default it offers very simple features, meanwhile there are a lot of custom addons for it.

Sometimes i need to put some unique custom rule inside Contact Form 7, without finding corresponding addon.

Here is how i do this:

March 14, 2019April 16, 2019

Quick fix for Cloudflare and PHP REMOTE_ADDR IP Detection

Some CMS-s, Frameworks, Custom Codes have built-in functions on collecting user logs (registrations, updates, submits, payments etc.) where they are using PHP’s $_SERVER[“REMOTE_ADDR”] variable to get the visitor’s IP address.

But as you know very popular Cloudflare Cloud Service passes all your traffic through its own servers – and that’s why all log function which i mentioned above writes Cloudflare’s IP address to the DataBase, not visitor’s actual IP address.

What to do for that.