<?php$a = 5;$a += 2; // 即 $a = $a + 2;echo $a."<br>\n";$b = "哇";$b .= "哈"; // $b = "哇哈";$b .= "哈"; // $b = "哇哈哈";echo "$b<br>\n";?>
原文转自:http://www.ltesting.net