how to set multiple fvariables into one variable php code example

Example 1: How do i multiple variables in php

$totalvariablename = $variablename * $othervariablename + ($othervariablename * 2);

Example 2: assign multiple variables php

[$var1, $var2, $var3, $var4, $var5] = array(1, 2, 3, 4, 5);