Php on jpcercal.com

WordPress Tip: How to use Shortcodes

Tue, 22 Oct 2013 12:05:38 +0000

Since version 2.5+, WordPress has had a feature known as shortcodes, it works similarly to filters, because they accept parameters (attributes) and return a result.

Well, shortcodes are extremely useful and easy to use, allowing developers to create custom content for users to add to their pages.

Next we’ll see how simple it is to add a shortcode to your theme. So we’ll get to know the do_shortcode() function.

To use this function, just add the following code to your theme:

WordPress Tip: How to check whether a plugin is active?

Wed, 28 Aug 2013 17:40:54 +0000

When you’re developing a theme or a plugin for the WordPress platform, you may need to check whether a specific plugin is activated. Well, here’s a simple script to check whether a plugin is activated or not in the wordpress administration panel.

You’ll only need to change line 4 to your plugin’s directory name.

Note: Plugins are located in the directory: /wp-content/plugins/

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<?php

// Adicione esta linha se este pedaço de código
// não estiver sendo executado no painel administrativo
require_once(ABSPATH . '/wp-admin/includes/plugin.php');

// Verifica se o plugin está ativado...
if (is_plugin_active('plugin-directory/plugin-file.php')) {
 // o plugin está ativado...
} else {
 // O plugin está desativado...
}

That was another tip for the WordPress platform.

How and Why you should include jQuery from Google CDN in WP

Mon, 26 Aug 2013 17:30:19 +0000

jQuery is a library widely used for web development, and in WordPress we have this library included in the default installation package.

In this article, I’ll show you how and why you should replace WordPress’s default jQuery with jQuery from Google CDN (Content Distribution Network).

But why should you replace it?

Generally speaking, you should do this so the script loads faster for the end user.

Here are the points that should lead you to adopt this practice.

Installing PHPUnit on OSX 10.8 Mountain Lion

Sat, 24 Aug 2013 15:00:39 +0000

Hello, today I’ll demonstrate how to install PHPUnit on Apple’s operating system. This guide should also be compatible with earlier operating systems in the apple family, such as Snow Leopard and Lion.

If you use the Microsoft Windows operating system, you can read this other tutorial: Installing PHPUnit on Windows.

Well, let’s install PHPUnit on OSX.

Open the Terminal and check whether PEAR is already installed with the following command.

WordPress Hack: How to get a Post's content by ID

Fri, 23 Aug 2013 14:52:26 +0000

When you’re building a theme for WordPress, you may need to get the content of a specific post using the ID as a filter. Most of the time you get a post’s content through the get_post_content function inside a Loop.

However, when you need to retrieve a post’s information outside the loop context or at a separate point in the application, the best solution is to use the get_post_field('field-name'), $postId) function.

Installing PEAR on OSX 10.8 Mountain Lion

Thu, 04 Apr 2013 22:28:01 +0000

Folks, this time we’ll learn to install PEAR on Apple’s operating system. This guide should also be compatible with earlier operating systems in the apple family, such as Snow Leopard and Lion.

Well, let’s share the recipe.

Open the Terminal and check whether PEAR is already installed with the following command.

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$ pear version

If it isn’t installed, the command’s output should look like:

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pear: command not found

If you saw the message above, then we can install pear, because it isn’t on your operating system.

How to get a Page Permalink

Sat, 09 Feb 2013 10:17:18 +0000

Today we needed to get the permalink of a page in WordPress whose post_type is “page”. To do this, we had to combine two functions, which are: get_permalink() and get_page_by_path().

How to Get a Page Permalink using the Page Name:

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<a href="<?php echo get_permalink( get_page_by_path('Eventos') ); ?>">
 <?php _e('Eventos', 'jpcercal.com'); ?>
</a>

How to Get a Page Permalink using the Page Slug:

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<a href="<?php echo get_permalink( get_page_by_path('cadastrar-cliente') ); ?>">
 <?php _e('Cadastrar Cliente', 'jpcercal.com'); ?>
</a>

Note About Page Hierarchy and Slugs.

Excerpts on WordPress 3.0+ pages

Sun, 09 Dec 2012 03:12:27 +0000

If you’ve ever needed to add excerpts to pages in WordPress 3.0+, you can be happy because the tip is very simple. Just add the following code to a file that wordpress loads automatically.

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<?php
/**
 * @param string $post_type
 * @param string|array $supports
 */
add_post_type_support('search', 'excerpt');

Usually the code above is placed in an “init” action hook.

This will enable a new field in the administration panel, letting you add an excerpt to your pages.

Installing PHPUnit on Windows

Wed, 06 Jun 2012 21:07:19 +0000

Hello person(s), today I’ll present a step-by-step guide to installing PHPUnit on Uncle Bil Gates’ famous operating system, Microsoft Windows 7 (Seven), before continuing with the tutorial I wanted to talk a little about unit tests and test-driven development (the famous TDD – Test Driven Development).

So, what is TDD?

TDD is a method for building software, not just testing it. Through the “Red”, “Green”, “Refactoring” process, you notice that the code becomes clean, organized and best of all, working!

PHP 5.4 Release

Fri, 02 Mar 2012 04:26:38 +0000

Hey folks! I’ve just seen, this very moment, that PHP 5.4 is fresh out of the oven, which you can check directly on the official PHP website.

This version includes a large number of new features and bug fixes. If you’re not familiar with PHP yet, read the following post: Introduction to PHP.

Among the main new features are:

Traits
Built-in web server
Better performance and reduced memory consumption
Small improvements in various extensions
Short Tags are now always available
Array dereferencing (being able to use square brackets on elements that return an array)

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<?php

// Exemplo:
foo()[0]

Short syntax for arrays

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<?php

// Exemplo:
$a = [
 'um' => 1,
 'dois' => 2
];

CakePHP problem with mod_rewrite

Thu, 23 Feb 2012 03:10:27 +0000

Hello, good evening. Today I had problems with CakePHP URL rewriting, and decided to share the error and how I solved it.

The problem was that when I tried to access the application’s URL through the browser, it returned the following error 404 – Not Found.

Well, first, after looking for inconsistencies in controller and action names, clearing the cache, checking whether URL rewriting was enabled in Apache, etc, I turned to Google. After some research, I found the solution in Cake’s own documentation.

Zend disable the layout and view renderer

Tue, 29 Nov 2011 16:54:51 +0000

Some people have been asking me how to disable the layout and view renderer in Zend Framework so an action in a given controller returns only JSON. Well, to do this, just use two lines of code, as you can see below.

This first approach disables the layout and view renderer for all actions in a given controller:

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public function preDispatch()
{
 $this->_helper->layout()->disableLayout();
 $this->_helper->viewRenderer->setNoRender(true);
}

However, this second approach disables the layout and view renderer for only one action, in this case “index”:

Custom Fields in the Joomla panel

Mon, 10 Oct 2011 17:32:40 +0000

Hello, today I needed to add a custom field to the Joomla 1.6 administration panel for a component I was developing, and decided to share the “recipe” here on my blog.

This tutorial was developed based on the Official Joomla Documentation.

To create a custom field type for Joomla 1.6, you must create a class that extends a field type already defined by Joomla itself (media, text, etc), or else the base class for this functionality, which is “JFormField”.

The CamelCase Convention

Wed, 08 Dec 2010 17:03:07 +0000

CamelCase (camel case) is the practice of writing compound words or phrases with their elements joined, without spaces, and the first letter of each element capitalized, meaning the uppercase letters “jump” out among the lowercase ones like a camel’s humps.

Example: “meuComputador, “jogoDeFutebol” or “linguagemProgramacao”.

Introduction to PHP

Thu, 07 Oct 2010 14:09:50 +0000

PHP, or Hypertext Preprocessor, is simply the most widely used server-side language on the web.

In 1994, thanks to its potential and simplicity, it gained wide acceptance in the webmaster community.

PHP allows easy integration with HTML markup. Numerous functions for exploring databases easily, without complications.

We could make the comparison that PHP and ASP are similar languages in terms of power and difficulty, although the syntax can differ considerably. Some main differences can still be mentioned: