<?php
$str_string1 ='甲问："你哪里学的PHP？"';
$str_string2 ="乙毫不犹豫的回答：'当然是慕课网咯！'";
$str_string3 ='甲问：\'你能告诉我网址吗\'';
$str_string4 ="乙答道：\"www.imoc.com\"";
echo $str_string1;
echo "<br />";
echo $str_string2;
echo "<br />";
echo $str_string3;
echo "<br />";
echo $str_string4;
echo "<br />";
?>