Merge pull request #293 from afaqurk/phpDocumentationUpdate

PHP documentation update

php.html.markdown

@@ -59,6 +59,9 @@ $float = 1.234;
 $float = 1.2e3;
 $float = 7E-10;
 
+// Delete variable
+unset($int1)
+
 // Arithmetic
 $sum        = 1 + 1; // 2
 $difference = 2 - 1; // 1
@@ -136,6 +139,11 @@ echo $associative['One']; // prints 1
 $array = ['One', 'Two', 'Three'];
 echo $array[0]; // => "One"
 
+// Add an element to the end of an array
+$array[] = 'Four';
+
+// Remove element from array
+unset($array[3]); 
 
 /********************************
  * Output
@@ -177,7 +185,7 @@ echo $x; // => 2
 echo $z; // => 0
 
 // Dumps type and value of variable to stdout
-var_dumb($z); // prints int(0)
+var_dump($z); // prints int(0)
 
 // Prints variable to stdout in human-readable format
 print_r($array); // prints: Array ( [0] => One [1] => Two [2] => Three )