Add content for PHP strings (#27489)

* Add content for PHP strings

* fix: resolved conflict

mock-guide/english/php/forms/handling-form-input/index.md

@@ -0,0 +1,18 @@
+---
+title: Handling Form Input
+---
+## Handling Form Input
+GET VS POST
+
+One can get form inputs with global variables $_POST and $_GET.
+```
+$_POST["firstname"] or $_GET['lastname']
+```
+
+
+<a href='https://github.com/freecodecamp/guides/blob/master/README.md' target='_blank' rel='nofollow'>This quick style guide will help ensure your pull request gets accepted</a>.
+
+<!-- The article goes here, in GitHub-flavored Markdown. Feel free to add YouTube videos, images, and CodePen/JSBin embeds  -->
+
+#### More Information:
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