Apart from plain text, however, PHP can also handle numbers and do math with them.

 <body>
  8
 </body>
</html>
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Magical! The * sign is an operator that multiplies two numbers. The +  operator unsurprisingly, will add two numbers. 

Psst: numbers have no quotation marks around them.

If we want to operate on numbers, we shouldn't wrap them in quotation marks, as it tends to give unexpected results.