Django vs PHP

Installing Python: Django requires Python 2.6.5 version or a higher one.

Once this is done you can go ahead to install Django. Installation of Django is easy and Python being platform independent it has one package that works everywhere. Django can be downloaded from http://www.djangoproject.com/download

You will get a tar file which you can extract and install.

cd Django-x.xx

sudo python setup.py install

Once the installation is complete you can check it by running below command: Django-admin.py –version

It also supports various databases like MySQL, Oracle, etc.

Web Server: PHP will work with all web software

Database: It supports all famous databases

PHP Parser: A parser needs to be installed in order to generate HTML output for Web browsers.

PHP Parser Installation- Before installing PHP Parser check if this link is updated

http://127.0.0.1/info.php

If this link runs successfully then PHP and Web server and installed successfully.

You can navigate to the place where a project has to be created.

$ Django-admin startproject myproject

This command will help you create a project name myproject at the respective location. The structure will be as follows:

myproject/

   manage.py

   myproject/

      __init__.py

      settings.py

      urls.py

      wsgi.py

This structure can be defined as:

manage.py This file acts as a project local Django-admin for interacting purposes via command prompt.

The myproject subfolder is the actual python package. It contains below:

•  _init_.py: This folder can be treated as a package.
• Settings.py: This file contains the settings for your project.
• Urls.py: All links used in your project and the functions to call are stored in this file
• Wsgi.py: During deployment, this file comes handy and can be used to deploy over WSGI

Escaping to PHP

The PHP parsing engine needs a differentiator to differentiate between normal code and PHP elements. This can be done in four ways as below:

-Canonical PHP tags: The universally accepted PHP tag is <?php…?>

-Short open(SGML-style) tags

These tags look like – <?..?>

To use these use –enable short tags configuration option when you build PHP.

Set short_open_tags setting in php.ini file. This should be disabled to parse XML with PHP.

-ASP-style tags: These tags are used by Active server pages to delineate code blocks. These are also called mimic tags. They can be used as <%…%>

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-HTML script tags: These can be used with HTML as well and are used together with HTML tags as below:

<script language = “PHP”>…</script>

Upload Images: Python Image Library should be installed prior to uploading an image. The code to upload image is as below:

#-*- coding: utf-8 -*-

from Django import forms

class ProfileForm(forms.Form):

   name = forms.CharField(max_length = 100)

   picture = forms.ImageFields()

The difference here is forms.ImageField which will make sure that a file will be uploaded. If this does not succeed then this event will fail.

This also has a mandatory field upload_to which will represent the place on a hard drive where images will be saved. After this, we will have to create a view in myapp/views.py

We also need to have requested.FILES, which if not sent will give an error.

<?php

   if(isset($_FILES[‘image’])){

      $errors= array();

      $file_name = $_FILES[‘image’][‘name’];

      $file_size =$_FILES[‘image’][‘size’];

      $file_tmp =$_FILES[‘image’][‘tmp_name’];

      $file_type=$_FILES[‘image’][‘type’];

      $file_ext=strtolower(end(explode(‘.’,$_FILES[‘image’][‘name’])));

      $expensions= array(“jpeg”,”jpg”,”png”);

      if(in_array($file_ext,$expensions)=== false){

         $errors[]=”extension not allowed, please choose a JPEG or PNG file.”;

      }

      if($file_size > 2097152){

         $errors[]=’File size must be excately 2 MB’;

      }

      if(empty($errors)==true){

         move_uploaded_file($file_tmp,”images/”.$file_name);

         echo “Success”;

      }else{

         print_r($errors);

      }

   }

?>

<html>

   <body>

      <form action=”” method=”POST” enctype=”multipart/form-data”>

         <input type=”file” name=”image” />

         <input type=”submit”/>

      </form>

   </body>

</html>

Once this is done an upload script can be created which will have PHP variables in a file called $_FILES. Following five variables are created once this file is created:

$_FILES[‘file’][‘tmp_name’]

$_FILES[‘file’][‘name’]

$_FILES[‘file’][‘size’]

$_FILES[‘file’][‘type’]

$_FILES[‘file’][‘error’]