Added PHP Type Casting to Guide. (#33762)

* Added PHP Type Casting to Guide.

* Added PHP Do While Loop to Guide.

* Delete index.md

* fix: capitalize title

guide/english/php/type-casting/index.md

@@ -0,0 +1,60 @@
+---
+title: Type Casting
+---
+
+## Type Casting in PHP
+
+In PHP, variable types are not explicitly declared. Instead, a variables type is determined by what value is assigned to that variable. That is to say, if a string value is assigned to variable $var, $var becomes a string. If an integer value is then assigned to $var, $var becomes an integer.
+
+As you can imagine, this can cause some issues at times. For example, if I assign a variable the value "123", it is a string, but if I assign it 123, it will be an int.
+
+Sometimes we want to ensure that a variable is of a certain type, and that is where type casting comes in. It allows us to define the type of a variable to ensure we get the correct value from that variable.
+
+## Syntax
+
+To cast a variable to a specific type, simply write the type inside parenthesis in front of the variable.
+
+
+```
+<?php
+
+(string) $string = 'abc';
+(int) $num = 123;
+```
+Below are some more examples of type casted variables;
+
+```
+<?php
+
+(int) $num = 123;
+(bool) $bool = false;
+(float) $float = 
+(double) $double = 
+(string) $string = "abc";
+(array) $arr = [];
+(unset) $null = null;
+```
+You can use type casting inside of functions to predetermine variable types passed into that function.
+
+```
+public function foo ( (string) $myString, (int) $myInt) {
+   //Code Here
+}
+
+```
+
+
+## List of Types
+
+Below is a list of casts that are allowed:
+
+(int), (integer) - cast to integer </br>
+(bool), (boolean) - cast to boolean </br>
+(float), (double), (real) - cast to float </br>
+(string) - cast to string </br>
+(array) - cast to array </br>
+(object) - cast to object </br>
+(unset) - cast to NULL </br>
+
+
+For more information, please see [PHP: Type Juggling](http://php.net/manual/en/language.types.type-juggling.php)