PHP采集程序中常用的函数

//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);
        $txt = str_replace("<","&lt;",$txt);
        $txt = str_replace(">","&gt;",$txt);
        $txt = preg_replace("/[ ]{1,}/isU","<br/> ",$txt);
        return $txt;
}

//清除HTML标记
function ClearHtml($str){
        $str = str_replace(<,&lt;,$str);
        $str = str_replace(>,&gt;,$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])) {
        $new_content = preg_replace(/href="//, href=".$protocol[0].$server_url./, $content);
        $new_content = preg_replace(/src="//, src=".$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(/<as+href=["|]?([^>" ]+)["|]?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
        $table = preg_replace("([ ])[s]+","",$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
        $table = preg_replace("([ ])[s]+","",$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];
}