大家好，
请问PHP, MySQL如何生成下面的文件？谁能指导我一下呢？
PHP code:
<?php
if ($_REQUEST['root'] == "source"):
?>
[
{
"text": "1. Pre Lunch (120 min)",
"expanded": true,
"classes": "important",
"children":
[
{
"text": "1.1 The State of the Powerdome (30 min)"
},
{
"text": "1.2 The Future of jQuery (30 min)"
},
{
"text": "1.2 jQuery UI - A step to richnessy (60 min)"
}
]
},
{
"text": "2. Lunch (60 min)"
},
{
"text": "3. After Lunch (120+ min)",
"children":
[
{
"text": "3.1 jQuery Calendar Success Story (20 min)"
},
{
"text": "3.2 jQuery and Ruby Web Frameworks (20 min)"
},
{
"text": "3.3 Hey, I Can Do That! (20 min)"
},
{
"text": "3.4 Taconite and Form (20 mi
<!--购买数量-->
<div class='buyinfo'>
<table width='auto'>
<tr>
<td><span>购买数量：</sp ......
