<?php $a = 3; $a += 5; // sets $a to 8, as if we had said: $a = $a + 5; $b = "Hello "; $b .= "There!"; // sets $b to "Hello There!", just like $b = $b . "There!"; ?>
$my_var = "foo"; $my_var .= " bar"; echo($my_var); // foo bar