megacolorboy

Abdush Shakoor's Weblog

Writings, experiments & ideas.

Convert to date from timestamp using Carbon

Using Carbon's createFromFormat() method is basically a wrapper for DateTime::createFromFormat(), the main difference between the two methods is that you can add a timezone to Carbon's method.

Here's a sample on how you can convert to date using timestamp using Carbon:

<?php
    function formatDate(Request $request) {
        return \Carbon\Carbon::createFromFormat('Y-m-d H:i:s', $request->date)->format('Y-m-d');
    }
?>

Hope you found this useful!

Clearing cache on a Shared Hosting Server

Hosted your website on a Shared Hosting Server and got limited access to clear the cache on your project?

Open up routes/web.php and create this route:

<?php
Route::get('/clearcache', function(){
    \Artisan::run('config:clear');
    \Artisan::run('cache:clear');
    \Artisan::run('view:clear');
    \Artisan::run('route:clear');
    \Artisan::run('config:cache');
});
?>

Just type the URL and it will clear all existing cache from the project.

Hope this helps you out!

Convert string to date using MySQL

Today, I was debugging a piece of code that is supposed to return a list of data based on the year, the funny thing is that the data was being returned on the development server but not on the production one.

Weird, so I opened up MySQL Workbench and wrote a simple query to see if the dates were being returned because who knows maybe they weren't stored at all.

SELECT YEAR(date_posted) FROM posts;

The values returned were null. Now, that's strange because the dates were present in the column. So, I took a deep look and figured out that the dates were stored in VARCHAR instead of DATETIME data type! ๐Ÿ˜”

Luckily, I figured that there's a way to resolve this by STR_TO_DATE() function:

SELECT YEAR(STR_TO_DATE(date_posted, '%Y-%m-%d')) FROM posts;

Bam! The results were coming now! ๐Ÿ˜Œ

Hope this helps you out!

Use MySQL 8.0 with Native Password Authentication

Last month, I was configuring an Ubuntu Server to deploy a client's project that uses MySQL 8.0 and PHP 7.2. So, I installed the necessary dependencies and finally installed MySQL 8.0, created a new schema and imported the database tables required for the project.

Next, I typed the project URL and ran into this error:

Unable to load plugin 'caching_sha2_password'

If you're running PHP 7.2 and facing this error, you should know that PHP 7.2 doesn't support native password authentication by default. But it's a simple fix, all you have to do is either one of the following:

  1. Alter the current user's authentication to native password
  2. Create a new user with native password authentication

Alter the current user's authentication to native password

ALTER USER 'your_user'@'your_server_host' IDENTIFIED WITH mysql_native_password BY 'your_password';

Create a new user with native password authentication

CREATE USER 'your_user'@'your_server_host ' IDENTIFIED WITH mysql_native_password BY 'your_password'

For the changes to take effect, you need to reload the privileges by typing the following:

FLUSH PRIVILEGES;

Hope this helps you out!

Create migrations and seeds from an existing database

Up until now, I've written migrations and generated seeders for some Laravel projects that I have worked on but recently, I thought of seeing if there's a way to generate migrations and seeds from an existing database especially if it's a project that never had any migrations or seeds created before.

Luckily, I found these two packages, which turned out to be quite productive:

  1. kitloong/laravel-migrations-generator
  2. orangehill/iseed

Execute the following commands to install the packages mentioned above:

composer require --dev "kitloong/laravel-migrations-generator"
composer require orangehill/iseed

Generate migrations using existing database

You can generate your migrations for all tables like this:

php artisan migrate:generate

Or, you can specify the tables you wish to generate:

php artisan migrate:generate table1,table2,table3

Generate new seeds using existing database

You can generate seeds for a single table like this:

php artisan iseed table_name

And for multiple tables, you can do this:

php artisan iseed table1,table2,table3

Hope you find this tip useful!.

Show Git branch in your Bash prompt (with colors)

Do you work on a project with multiple Git branches but don't know which one you're in? Open your .bashrc file and add this:

force_color_prompt=yes
color_prompt=yes

parse_git_branch() {
 git branch 2> /dev/null | sed -e '/^[^*]/d' -e 's/* \(.*\)/(\1)/'
}

if [ "$color_prompt" = yes ]; then
 PS1='${debian_chroot:+($debian_chroot)}\[\033[01;32m\]\u@\h\[\033[00m\]:\[\033[01;34m\]\w\[\033[01;31m\]$(parse_git_branch)\[\033[00m\]\$ '
else
 PS1='${debian_chroot:+($debian_chroot)}\u@\h:\w$(parse_git_branch)\$ '
fi

unset color_prompt force_color_prompt

Updated: November 26th, 2022

The above script works fine for Ubuntu but doesn't work fine on other distros. Here's an alternative one that works on all distros:
parse_git_branch() {
    git branch 2> /dev/null | sed -e '/^[^*]/d' -e 's/* \(.*\)/(\1)/'
}

export PS1="\u@\h \[\e[32m\]\w \[\e[91m\]\$(parse_git_branch)\[\e[00m\]$ "

Save the file and execute this command for your changes to take effect:

source ~/.bashrc

Now, you should see your colors in your Bash prompt along with the Git branch that you're working on (Note: this will be shown if you're in a project that uses a Git repository).

Hope this helps you out!

Resolve the "General error: 1835 Malformed communication packet" error

This happened like two days ago, when one of the client sites went down. Upon inspecting the error logs, I found this:

SQLSTATE[HY000]: General error: 1835 Malformed communication packet

If you got the same error as the one above, don't worry, it's not your fault. According to this forum, a recent MariaDB update introduced a new bug for PHP versions < 7.3 that uses PDO and MySQL connectors. You can easily resolve this by simply upgrading it to PHP 7.3.

Hope this tip helps you out!

Find and remove duplicate lines using Regular Expressions

Open up your text editor and use the following RegEx pattern to find and remove the duplicate lines:

^(.*)(\r?\n\1)+$

I found this technique on Regular-Expressions.info and I'm going to quote their explanation over here:

The caret will match only at the start of a line. So the regex engine will only attempt to match the remainder of the regex there. The dot and star combination simply matches an entire line, whatever its contents, if any. The parentheses store the matched line into the first backreference.

Next we will match the line separator. I put the question mark into `\r?\n` to make this regex work with both Windows `(\r\n)` and UNIX `(\n)` text files. So up to this point we matched a line and the following line break.

Now we need to check if this combination is followed by a duplicate of that same line. We do this simply with `\1`. This is the first backreference which holds the line we matched. The backreference will match that very same text.

If the backreference fails to match, the regex match and the backreference are discarded, and the regex engine tries again at the start of the next line. If the backreference succeeds, the plus symbol in the regular expression will try to match additional copies of the line. Finally, the dollar symbol forces the regex engine to check if the text matched by the backreference is a complete line. We already know the text matched by the backreference is preceded by a line break (matched by `\r?\n`).

Therefore, we now check if it is also followed by a line break or if it is at the end of the file using the dollar sign.

The entire match becomes `line\nline` (or `line\nline\nline` etc.). Because we are doing a search and replace, the line, its duplicates, and the line breaks in between them, are all deleted from the file. Since we want to keep the original line, but not the duplicates, we use `\1` as the replacement text to put the original line back in.

Hope you found this tip useful!