05.12.19

Setting default values for requests the easy way

- PHP, Uncategorized -

PHP 7 introduced the Null Coalesce Operator, and this is a very neat addition to PHP in practice. It will let you write code that is much easier to read and much more concise.

You don’t have to wrestle anymore with isset() and ternary operators.

Just write this:

$offset = $_GET['offset'] ?? 0;

It there is now offset parameter in the GET request, $offset will be assigned the default value 0.

This is much like the way you can do that in Python or Javascript.

Before 7 you needed to write this in PHP:

if (isset($request->input['offset'])) {
$offset = $request->input['offset'];
} else {
$offset = 0;
}

08.11.19

JSON Encoding of number problem

- Uncategorized -

You can get quite surprising results if you try to json_encode something like json_encode($n[“number”]=3.53).

echo json_encode($n["number"]=3.53);
3.5299999999999998

Seems there is a bug in PHP, that parse floats with wrong precision.

Currently json_encode() uses EG(precision) which is set to 14.

The solution is to cast the number to string:

echo json_encode($n["number"]=(string) 3.53);
"3.53"

Another solution is to set the precision explicitly:

ini_set( 'serialize_precision', -1 );
echo json_encode($n["number"]=3.53);
3.53

Weird bug, that’s causing quite some headscratching.

You could also set it in php.ini:

serialize_precision = -1

23.02.17

How to format JSON in VIM/GVIM

- Tutorial -

The strength and beauty of VIM is the simple interaction with lots of external programs.

To format any JSON file in VIM/GVIM:

:% !jq .

% means the file you’re working on, and `!jq` is run the external command `jq`

That’s all.

You need to have `jq` installed:
sudo apt install jq
whatis jq
jq (1) - Command-line JSON processor

03.02.17

The ease and beauty of VIM

- Uncategorized -

Never thought that I would write a post with the ease of VIM in the title. But honestly I tried a lot of editors still coming back to VIM. VIM is a lot more hackable then Atom.

Probably because I like bash, python and javascript, while Atom is javascript hackable only.

VIM is not easy at first sight, and certainly not easy at first touch. Counterintuitive to the noob, all the difference modes VIM can be in, you somehow love it after a while.

Try the VIM editor

If you’re interested just try it out.
apt install vim

Run vimtutor after you installed VIM. I surely recommend the great VIM casts, of Drew Neil. Excellent learning stuff. Best to watch after you installed VIM and tried the VIMTutor.

Back to the title, the ease of VIM for productivity. Sure you need to extend it and use plugins. UltiSnips is one of my favorite.

Use snippets with UltiSnips

A good setup of snippets are a real time saver. There are pre-installed snippets, but you need to setup your own snippets, because they reflect how you think, and they should suit into your workflow.

For testing sites on Apache, or protecting a WordPress login from, you often use access control,  to restrict access to portions of your site based on the host address of your visitors.

You create a Deny Allow directive  for that in .htaccess.

order deny,allow
deny from all
allow from [your-ip]

Create a deny allow snippet

To speed up inserting earlier code in any .htaccess file your editing in VIM/GVIM, create a apache.snippets file in your UltiSnips directory (~/.vim/UltiSnips by default), and add this to the file:

snippet deny "Deny allow snippet" b
order deny,allow
deny from all
allow from `curl ipinfo.io/ip`
endsnippet

Done, every time you type `deny` hit tab and the snippet is inserted with the ip-address of the computer you’re working on. Through  `bash interpolation`, the snippets insert the output of the command `curl ipinfo.io/ip` which is the linux way of getting your ip-adress. Compare that to Microsofts Windows way. Never say again that Linux is not easy.

So, easy after all, isn’t it? That’s why I call VIM easy. Of course it isn’t actually, but there is beauty in the way it works, and the way you can make it work, fast en easy.

10.09.15

Creating a key for a new Lumen Micro Framework install

- PHP -

Lumen is the smaller but faster brother of the popular Laravel Framework. And faster means less features out of the box.

Starting a new Lumen framework is quite easy, once you have the Lumne installer globally installed. I can recommend that.

Install Lumen installer globally

composer global require "laravel/lumen-installer=~1.0"

Once you have installed a new Lumen framework, you actually have to do a few things extra:

  • copy the example.env to .env
  • generate an app key

With Laravel you can issue the command php artisan key:generate to generate the key, but Lumen doesn’t have that feature. Remember it’s smaller to be faster.

Of course you can do it manually, but let’s create a small shell script to do a few things manually.

A helper-script for a new Lumen install

#!/bin/bash
if [ "$1" != "" ]; then

#setup default directory
cd /home/user/web

lumen new $1

cd $1

cp .env.example .env

key=`php -r "echo md5(uniqid()).\"\n\";"`;

sed -i "s/APP_KEY=SomeRandomKey!!!/APP_KEY=$key/" .env

fi

Save the script as newlumen.sh in ~/bin, set the appropriate execute permission and you can install a new Lumen framework, by running:

newlumen.sh website

It will run all the mentioned steps above automatically:

  1. create a new Lumen install
  2. copy the .env file
  3. generate an application key in the .env file
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