<?php
$str_string1 = '甲问："你在哪里学的PHP？"';
$str_string2 = "乙毫不犹豫地回答：'当然是慕课网咯！'";
$str_string3 = '甲问：\'能告诉我网址么？\'';
$str_string4 = "乙答道：\"www.xvideos.com\"";
echo $str_string1;
echo "<br />";
echo $str_string2;
echo "<br />";
echo $str_string3;
echo "<br />";
echo $str_string4;
echo "<br />";
?>
