[PHP]实用函数3

//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); 
        $txt = preg_replace("/[\r\n]{1,}/isu"," 
\r\n",$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])) {  
        $new_content = preg_replace('/href="\//', 'href="'.$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($code){  
        preg_match_all('/<a\s+href=["|\']?([^>"\' ]+)["|\']?\s*[^>]*>([^>]+)<\/a>/i',$code,$arr);  
        return array('name'=>$arr[2],'url'=>$arr[1]);  
} 

//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); 
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]; 
}