Add PHP screencasts (EbookFoundation#3092)

* Add PHP screencasts

* Correct the number of blank spaces

* Update free-podcasts-screencasts-pt_BR.md

* Alphabetical ordering

I didn't know all this rules to edit a file, my bad.

free-podcasts-screencasts-pt_BR.md

@@ -6,6 +6,7 @@
 * [iOS](#ios)
 * [Java](#java)
 * [Language Agnostic](#language-agnostic)
+* [PHP](#php)
 * [Vue.js](#vuejs)
 
 
@@ -47,6 +48,12 @@
  * [PodProgramar](https://mundopodcast.com.br/podprogramar) (podcast)
 
 
+### PHP
+
+* [Gustavo Guanabara - PHP Iniciante](https://www.youtube.com/watch?v=F7KzJ7e6EAc&list=PLHz_AreHm4dm4beCCCmW4xwpmLf6EHY9k) (screencast)
+* [Gustavo Guanabara - PHP Orientado a Objetos](https://www.youtube.com/watch?v=KlIL63MeyMY&list=PLHz_AreHm4dmGuLII3tsvryMMD7VgcT7x) (screencast)
+
+
 #### Vue.js
 
 * [Série de vídeos sobre Vue.js](https://vimeo.com/channels/1115590/videos/) - Origem: Vedovelli  (screencast)