<?php
/***************
 *Author: 水木
 *Date: 2012-12-25
 *Description:
 *PHP函数应用编程练习
 *Blog: www.4u4v.net
 *Email: [email protected]
 **********************/
$a = "Hello ";
$b = $a . "World!"; // now $b contains "Hello World!"
echo $b;
echo "<br>";
$a = "Hello ";
$a .= "World!";     // now $a contains "Hello World!"
echo $a;
?>