php怎么对文件做处理，并提取内容生成文件
php如何对文件做处理，并提取内容生成文件？
这是一个原html文件
<br /><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><br /><html xmlns="http://www.w3.org/1999/xhtml"><br /><head><br /><meta http-equiv="Content-Type" content="text/html; charset=gb2312" /><br /><title>无标题文档</title><br /></head><br /><body><br /><div class="header"></div><br /><br /><div class="warp"><br /><div><br /></div><br /><div><br /></div><br /><div><br /></div><br /><div><br /></div><br /></div><br /><br /><div class="footer"></div><br /></body><br /></html><br />
这是一个被处理过的html文件
<br /><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><br /><!-- Start --><br /><html xmlns="http://www.w3.org/1999/xhtml"><br /><head><br /><meta http-equiv="Content-Type" content="text/html; charset=gb2312" /><br /><title>无标题文档</title><br /></head><br /><body><br /><div class="header"></div><br /><!-- End --><br /><br /><br /><!-- Start --><br /><div class="warp"><br /><div><br /></div><br /><div><br /></div><br /><div><br /></div><br /><div><br /></div><br /></div><br /><!-- End --><br /><br /><br /><!-- Start --><br /><div class="footer"></div><br /></body><br /></html><br /><!-- End --><br />
然后提取内容片段，生成分别生成以下三个文件、
提取这个部分，生成 head.html
提取这个部分，生成 index.html
提取这个部分，生成 foot.html
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