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How to put Magento 2 in maintenance mode

Even I think this should be a simple checkbox in Magento Control Panel but the most simple way I found is to put a file in var folder with the name of: var/.maintenance.flag

If you want to allow an ip or a group of ips you simply write this list of ips in a file: var/.maintenance.ip

Of course if you have access to CLI you can just type:

bin/magento maintenance:enable –ip=1.2.3.4

where –ip=1.2.3.4 is the ip that can access the website normally ..

if you use a shared hosting, to run the above command you have to go to the public_html folder first :
cd public_html

and then run the command using php
php bin/magento maintenance:enable –ip=1.2.3.4

For more information go to :
https://devdocs.magento.com/guides/v2.3/install-gde/install/cli/install-cli-subcommands-maint.html

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How to read file content in Public folder with Laravel

If you want to read the content of a file in the public folder using Laravel, you can use this code 

$file_name = "test.dat";
$file_url = 'public\subfolder\\'. $file_name;
$content = file_get_contents(base_path($map_url));

base_path is a helper function to generate a fully qualified path to a given file relative to the project root directory

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How to configure your host in one company and your email in another

If you want to host your website with one company and your emails in another you have to edit your domain name DNS Zone.

All you have to do is to add A host @ to point to your website host and “mail” to point to your email server and finally add MX record @ with priority 0 and Points to mail.yourdomain.com ..

For more details, check this page:

How Do I Configure Email Hosted On a Different Server Than My Website?
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How to solve “gpg: public key decryption failed: Bad passphrase” in batch file

If you are trying to decrypt a file or a bunch of files using batch file in windows you will write something like this:

gpg --pinentry-mode=loopback --batch --yes --passphrase "abc%123" --decrypt-files *.pgp

and you put the above code in a .bat file and run it but you got an error like:

gpg: public key decryption failed: Bad passphrase

You are 1000% sure the passphrase is correct .. well the problem is in the passphrase itself as it contains a special character that needs to be escaped .. in the above example , the passphrase : “abc%123” must be written like this: “abc%%123” as %% is the escape of % … for a complete list of batch file escape characters , check this link

in case if you are wondering about the meaning of
–pinentry-mode=loopback  
it is used to prevent the gui from pooping up and asking for the passphrase.

Another important point , to make the batch option work without problem .. you have to make sure that the encrypted file extensions is *.pgp

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Rendering path for HTML web page

Here is the steps the browser takes to render a web page after receiving the content from the server:

  1. Constructing the DOM Tree
  2. Constructing the CSSOM Tree
  3. Running JavaScript
  4. Creating the Render Tree
  5. Generating the Layout
  6. Painting

You can use Google chrome DevTool “Performance” to view rendering in progress with details and charts.

For more details, check this page: 

https://bitsofco.de/understanding-the-critical-rendering-path/

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How to view latest SQL statement excuted in Laravel

To view the latest sql query executed in Laravel you can

DB::enableQueryLog();

print_r(DB::getQueryLog());

Note that you have to enable the query log before executing the query and view/print it after execution ..

A good practice is to enable it only in Local environment

if (App::environment('local')) {
    // The environment is local
    DB::enableQueryLog();
}