PHP采集程序中常用的函数

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PHP采集程序中常用的函数

以下为引用的内容：

//获得当前的脚本网址
function get_php_url(){
        if(!empty($_SERVER["REQUEST_URI"])){
                $scriptName=$_SERVER["REQUEST_URI"];
                $nowurl=$scriptName;
        }else{
                $scriptName=$_SERVER["PHP_SELF"];
                if(empty($_SERVER["QUERY_STRING"])) $nowurl=$scriptName;
                else $nowurl=$scriptName."?".$_SERVER["QUERY_STRING"];
        }
        return $nowurl;
}
//把全角数字转为半角数字
function GetAlabNum($fnum){
        $nums=array("０","１","２","３","４","５","６","７","８","９");
        $fnums="0123456789";
        for($i=0;$i<=9;$i++) $fnum=str_replace($nums[$i],$fnums[$i],$fnum);
        $fnum=ereg_replace("[^0-9\.]|^0{1,}","",$fnum);
        if($fnum=="") $fnum=0;
        return $fnum;
}
//去除HTML标记
function Text2Html($txt){
        $txt=str_replace("  ","　",$txt);
        $txt=str_replace("<","<",$txt);
        $txt=str_replace(">",">",$txt);
        $txt=preg_replace("/[\r\n]{1,}/isU","<br/>\r\n",$txt);
        return $txt;
}

//清除HTML标记
function ClearHtml($str){
        $str=str_replace('<','<',$str);
        $str=str_replace('>','>',$str);
        return $str;
}
//相对路径转化成绝对路径
function relative_to_absolute($content, $feed_url) {
    preg_match('/(http|https|ftp):\/\//', $feed_url, $protocol);
    $server_url=preg_replace("/(http|https|ftp|news):\/\//", "", $feed_url);
    $server_url=preg_replace("/\/.*/", "", $server_url);

    if ($server_url=='') {
        return $content;
    }

    if (isset($protocol[0])) {
        $new_content=preg_replace('/href=http://www.chinaz.com/program/2008/1222/"\//', 'href=http://www.chinaz.com/program/2008/1222/"'.$protocol[0].$server_url.'/', $content);
        $new_content=preg_replace('/src=http://www.chinaz.com/program/2008/1222/"\//', 'src=http://www.chinaz.com/program/2008/1222/"'.$protocol[0].$server_url.'/', $new_content);
    } else {
        $new_content=$content;
    }
    return $new_content;
}
//取得所有链接
function get_all_url($code){
        preg_match_all('/<a\s+href=http://www.chinaz.com/program/2008/1222/["|\']?([^>"\' ]+)["|\']?\s*[^>]*>([^>]+)<\/a>/i',$code,$arr);
        return array('name'=>$arr[2],'url'=>$arr[1]);
}

//获取指定标记中的内容
function get_tag_data($str, $start, $end){
        if ( $start=='' || $end=='' ){
               return;
        }
        $str=explode($start, $str);
        $str=explode($end, $str[1]);
        return $str[0];
}
//HTML表格的每行转为CSV格式数组
function get_tr_array($table) {
        $table=preg_replace("'<td[^>]*?>'si",'"',$table);
        $table=str_replace("</td>",'",',$table);
        $table=str_replace("</tr>","{tr}",$table);
        //去掉 HTML 标记
        $table=preg_replace("'<[\/\!]*?[^<>]*?>'si","",$table);
        //去掉空白字符
        $table=preg_replace("'([\r\n])[\s]+'","",$table);
        $table=str_replace(" ","",$table);
        $table=str_replace(" ","",$table);

        $table=explode(",{tr}",$table);
        array_pop($table);
        return $table;
}

//将HTML表格的每行每列转为数组，采集表格数据
function get_td_array($table) {
        $table=preg_replace("'<table[^>]*?>'si","",$table);
        $table=preg_replace("'<tr[^>]*?>'si","",$table);
        $table=preg_replace("'<td[^>]*?>'si","",$table);
        $table=str_replace("</tr>","{tr}",$table);
        $table=str_replace("</td>","{td}",$table);
        //去掉 HTML 标记
        $table=preg_replace("'<[\/\!]*?[^<>]*?>'si","",$table);
        //去掉空白字符
        $table=preg_replace("'([\r\n])[\s]+'","",$table);
        $table=str_replace(" ","",$table);
        $table=str_replace(" ","",$table);
      
        $table=explode('{tr}', $table);
        array_pop($table);
        foreach ($table as $key=>$tr) {
                $td=explode('{td}', $tr);
                array_pop($td);
            $td_array[]=$td;
        }
        return $td_array;
}

//返回字符串中的所有单词 $distinct=true 去除重复
function split_en_str($str,$distinct=true) {
        preg_match_all('/([a-zA-Z]+)/',$str,$match);
        if ($distinct==true) {
                $match[1]=array_unique($match[1]);
        }
        sort($match[1]);
        return $match[1];
}

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