<?php
function show1(){
echo "hello,world";
}
function show2(){
return "hello,world";
}
echo "dongdong:".show1();
echo "<hr/>";
echo "dongdong:".show2();
?>
//output /* hello,worldPHP7: ------------------------------------------------ PHP7:hello,world */
原文：http://my.oschina.net/dongdong11019/blog/513153