Verify link consistency - round 1

- Verify that all named links at the bottom of a post are in use, otherwise either remove or add link in post
- if the post uses named links, try and make sure all links in the post are in that style
- ensure logical order for the named links at the bottom

_posts/01-04-01-Mac-Setup.md

@@ -12,9 +12,8 @@ There are multiple ways to install PHP on OS X.
 
 ### Install PHP via Homebrew
 
-[Homebrew](http://brew.sh/) is a powerful package manager for OS X, which can help you install PHP and various
-extensions easily. [Homebrew PHP] is a repository that contains PHP-related "formulae" for Homebrew, and will let you
-install PHP.
+[Homebrew] is a powerful package manager for OS X, which can help you install PHP and various extensions easily.
+[Homebrew PHP] is a repository that contains PHP-related "formulae" for Homebrew, and will let you install PHP.
 
 At this point, you can install `php53`, `php54`, `php55` or `php56` using the `brew install` command, and switch
 between them by modifying your `PATH` variable.
@@ -27,8 +26,8 @@ applications/projects require different versions of PHP, and you are not using v
 ### Compile from Source
 
 Another option that gives you control over the version of PHP you install, is to [compile it yourself][mac-compile].
-In that case be sure to have installed either Xcode or Apple's substitute ["Command Line Tools for XCode"]
-downloadable from Apple's Mac Developer Center.
+In that case be sure to have installed either [Xcode][xcode-gcc-substitution] or Apple's substitute
+["Command Line Tools for XCode"] downloadable from Apple's Mac Developer Center.
 
 ### All-in-One Installers
 
@@ -38,10 +37,9 @@ you and tie them all together, but ease of setup comes with a trade-off of flexi
 
 [Homebrew]: http://brew.sh/
 [Homebrew PHP]: https://github.com/Homebrew/homebrew-php#installation
+[phpbrew]: https://github.com/phpbrew/phpbrew
 [mac-compile]: http://php.net/install.macosx.compile
 [xcode-gcc-substitution]: https://github.com/kennethreitz/osx-gcc-installer
-
 ["Command Line Tools for XCode"]: https://developer.apple.com/downloads
 [mamp-downloads]: http://www.mamp.info/en/downloads/
-[phpbrew]: https://github.com/phpbrew/phpbrew
 [xampp]: http://www.apachefriends.org/en/xampp.html

_posts/01-05-01-Windows-Setup.md

@@ -20,10 +20,10 @@ FastCGI built in and ready to go, you just need to configure PHP as a handler. F
 there is a [dedicated area on iis.net][php-iis] for PHP.
 
 [php-downloads]: http://windows.php.net
-[phpmanager]: http://phpmanager.codeplex.com/
 [wpi]: http://www.microsoft.com/web/downloads/platform.aspx
 [zsce]: http://www.zend.com/en/products/server-ce/
 [xampp]: http://www.apachefriends.org/en/xampp.html
 [easyphp]: http://www.easyphp.org/
 [wamp]: http://www.wampserver.com/en/
+[phpmanager]: http://phpmanager.codeplex.com/
 [php-iis]: http://php.iis.net/

_posts/03-02-01-Programming-Paradigms.md

@@ -47,15 +47,17 @@ available as `__call()` and `__callStatic()`.
 
 * [Read about Magic Methods][magic-methods]
 * [Read about Reflection][reflection]
+* [Read about Overloading][overloading]
+
 
-[namespaces]: http://php.net/language.namespaces
-[overloading]: http://php.net/language.oop5.overloading
 [oop]: http://php.net/language.oop5
+[traits]: http://php.net/language.oop5.traits
 [anonymous-functions]: http://php.net/functions.anonymous
 [closure-class]: http://php.net/class.closure
+[closures-rfc]: https://wiki.php.net/rfc/closures
 [callables]: http://php.net/language.types.callable
+[call-user-func-array]: http://php.net/function.call-user-func-array
 [magic-methods]: http://php.net/language.oop5.magic
 [reflection]: http://php.net/intro.reflection
-[traits]: http://php.net/language.oop5.traits
-[call-user-func-array]: http://php.net/function.call-user-func-array
-[closures-rfc]: https://wiki.php.net/rfc/closures
+[overloading]: http://php.net/language.oop5.overloading
+

_posts/03-05-01-Command-Line-Interface.md

@@ -58,6 +58,6 @@ Hello, world
 [cli-options]: http://php.net/features.commandline.options
 [argc]: http://php.net/reserved.variables.argc
 [argv]: http://php.net/reserved.variables.argv
+[exit-codes]: http://www.gsp.com/cgi-bin/man.cgi?section=3&topic=sysexits
 [php-cli]: http://php.net/features.commandline
 [php-cli-windows]: http://php.net/install.windows.commandline
-[exit-codes]: http://www.gsp.com/cgi-bin/man.cgi?section=3&topic=sysexits

_posts/03-06-01-XDebug.md

@@ -40,6 +40,6 @@ stand-alone xdebug GUI for Mac.
  * [Learn more about XDebug][xdebug-docs]
  * [Learn more about MacGDBp][macgdbp-install]
 
-[xdebug-docs]: http://xdebug.org/docs/
 [xdebug-install]: http://xdebug.org/docs/install
+[xdebug-docs]: http://xdebug.org/docs/
 [macgdbp-install]: http://www.bluestatic.org/software/macgdbp/

_posts/06-05-01-Further-Reading.md

@@ -5,8 +5,8 @@ anchor: further_reading
 
 ## Further Reading {#further_reading_title}
 
-- [Learning about Dependency Injection and PHP](http://ralphschindler.com/2011/05/18/learning-about-dependency-injection-and-php)
-- [What is Dependency Injection?](http://fabien.potencier.org/article/11/what-is-dependency-injection)
-- [Dependency Injection: An analogy](http://mwop.net/blog/260-Dependency-Injection-An-analogy.html)
-- [Dependency Injection: Huh?](http://net.tutsplus.com/tutorials/php/dependency-injection-huh/)
-- [Dependency Injection as a tool for testing](http://philipobenito.github.io/dependency-injection-as-a-tool-for-testing/)
+* [Learning about Dependency Injection and PHP](http://ralphschindler.com/2011/05/18/learning-about-dependency-injection-and-php)
+* [What is Dependency Injection?](http://fabien.potencier.org/article/11/what-is-dependency-injection)
+* [Dependency Injection: An analogy](http://mwop.net/blog/260-Dependency-Injection-An-analogy.html)
+* [Dependency Injection: Huh?](http://net.tutsplus.com/tutorials/php/dependency-injection-huh/)
+* [Dependency Injection as a tool for testing](http://philipobenito.github.io/dependency-injection-as-a-tool-for-testing/)

_posts/07-01-01-Databases.md

@@ -15,18 +15,18 @@ same drivers. You'll need to learn a brand new API for each database — and
 
 ## MySQL Extension
 
-The [mysql] extension for PHP is no longer in active development, and is [officially deprecated as of PHP 5.5.0],
-meaning that it will be removed within the next few releases. If you are using any functions that start with `mysql_*`
-such as `mysql_connect()` and `mysql_query()` in your applications then these will simply not be available in later
-versions of PHP. This means you will be faced with a rewrite at some point down the line, so the best option is to
-replace mysql usage with [mysqli] or [PDO] in your applications within your own development schedules so you won't be
-rushed later on.
+The [mysql] extension for PHP is no longer in active development, and is [officially deprecated as of PHP 5.5.0]
+[mysql_deprecated], meaning that it will be removed within the next few releases. If you are using any functions that
+start with `mysql_*` such as `mysql_connect()` and `mysql_query()` in your applications then these will simply not be
+available in later versions of PHP. This means you will be faced with a rewrite at some point down the line, so the
+best option is to replace mysql usage with [mysqli] or [PDO] in your applications within your own development schedules
+so you won't be rushed later on.
 
 **If you are starting from scratch then absolutely do not use the [mysql] extension: use the [MySQLi extension][mysqli],
 or use [PDO].**
 
-* [PHP: Choosing an API for MySQL](http://php.net/mysqlinfo.api.choosing)
-* [PDO Tutorial for MySQL Developers](http://wiki.hashphp.org/PDO_Tutorial_for_MySQL_Developers)
+* [PHP: Choosing an API for MySQL][mysql_api]
+* [PDO Tutorial for MySQL Developers][pdo4mysql_devs]
 
 ## PDO Extension
 
@@ -66,10 +66,9 @@ $pdo->query("SELECT name FROM users WHERE id = " . $_GET['id']); // <-- NO!
 {% endhighlight %}
 
 This is terrible code. You are inserting a raw query parameter into a SQL query. This will get you hacked in a
-heartbeat, using a practice called [SQL Injection](http://wiki.hashphp.org/Validation). Just imagine if a hacker
-passes in an inventive `id` parameter by calling a URL like `http://domain.com/?id=1%3BDELETE+FROM+users`. This will
-set the `$_GET['id']` variable to `1;DELETE FROM users` which will delete all of your users! Instead, you should
-sanitize the ID input using PDO bound parameters.
+heartbeat, using a practice called [SQL Injection]. Just imagine if a hacker passes in an inventive `id` parameter by
+calling a URL like `http://domain.com/?id=1%3BDELETE+FROM+users`. This will set the `$_GET['id']` variable to `1;DELETE
+FROM users` which will delete all of your users! Instead, you should sanitize the ID input using PDO bound parameters.
 
 {% highlight php %}
 <?php
@@ -92,10 +91,13 @@ unless of course you are using persistent connections.
 
 * [Learn about PDO connections]
 
+
+[mysql_deprecated]: http://php.net/migration55.deprecated
+[mysql_api]: http://php.net/mysqlinfo.api.choosing
+[pdo4mysql_devs]: http://wiki.hashphp.org/PDO_Tutorial_for_MySQL_Developers
+[SQL Injection]: http://wiki.hashphp.org/Validation
 [Learn about PDO]: http://php.net/book.pdo
 [Learn about PDO connections]: http://php.net/pdo.connections
-[officially deprecated as of PHP 5.5.0]: http://php.net/migration55.deprecated
-[SQL Injection]: http://wiki.hashphp.org/Validation
 
 [pdo]: http://php.net/pdo
 [mysql]: http://php.net/mysql

_posts/07-02-01-Interacting-via-Code.md

@@ -95,6 +95,7 @@ real problem if you ever want to [unit-test](/#unit-testing) your application.
 [PHPBridge] have a great resource called [Creating a Data Class] which covers a very similar topic, and is great for
 developers just getting used to the concept of interacting with databases.
 
+
 [MVC]: http://code.tutsplus.com/tutorials/mvc-for-noobs--net-10488
 [PHPBridge]: http://phpbridge.org/
 [Creating a Data Class]: http://phpbridge.org/intro-to-php/creating_a_data_class

_posts/07-03-01-Abstraction-Layers.md

@@ -6,9 +6,9 @@ anchor: databases_abstraction_layers
 
 ## Abstraction Layers {#databases_abstraction_layers_title}
 
-Many frameworks provide their own abstraction layer which may or may not sit on top of PDO. These will often emulate
-features for one database system that is missing from another by wrapping your queries in PHP methods, giving you
-actual database abstraction instead of just the connection abstraction that PDO provides. This will of course add a
+Many frameworks provide their own abstraction layer which may or may not sit on top of [PDO][1]. These will often
+emulate features for one database system that is missing from another by wrapping your queries in PHP methods, giving
+you actual database abstraction instead of just the connection abstraction that PDO provides. This will of course add a
 little overhead, but if you are building a portable application that needs to work with MySQL, PostgreSQL and SQLite
 then a little overhead will be worth it the sake of code cleanliness.
 
@@ -20,6 +20,7 @@ installed in any application you like:
 * [Propel][7]
 * [ZF2 Db][4]
 
+
 [1]: http://php.net/book.pdo
 [2]: http://www.doctrine-project.org/projects/dbal.html
 [4]: http://packages.zendframework.com/docs/latest/manual/en/index.html#zend-db

pages/Functional-Programming.md

@@ -83,5 +83,5 @@ defined to capture variables in scope and access them later when the anonymous f
 * [Read about dynamically invoking functions with `call_user_func_array`][call-user-func-array]
 
 [anonymous-functions]: http://php.net/functions.anonymous
-[call-user-func-array]: http://php.net/function.call-user-func-array
 [closures-rfc]: https://wiki.php.net/rfc/closures
+[call-user-func-array]: http://php.net/function.call-user-func-array