PHP crawling Web-specific data

Help: PHP crawls web-specific data
I want to crawl the page: http://www.pm2d5.com/City/xg_wangjiao.html page of the table PM2.5 specific data,
Is there any way to be more efficient? Thank you..

------Solution--------------------
I'm a stupid way, but my regular is too bad

PHP Code

$html is the www.pm2d5.com/City/xg_wangjiao.html content you want to crawl, this part you write $pattern =  "/[\s\s]+?<\/td>/i";p Reg_match_ All ($pattern, $html, $TDTAG);//Var_dump ($TDTAG);//To eliminate the matching result in the HTML tag $deletestrheader = "; $deleteStrFooter ="; Pmvalue = Array (); foreach ($tdTag [0] as $key = + $value) {               //when traversing to PM2.5 column        if (($key + 1)% 6 = = 0)        {            //Remove Header Tail html tag            $noHeaderStr = Str_replace ($deleteStrHeader, ", $value);            $CLEANSTR = Str_replace ($deleteStrFooter, ", $noHeaderStr);            Convert to floating-point            $pmvalue [] = (float) trim ($CLEANSTR);}           } Var_dump ($pmvalue);
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