PHP 采集程序中常用的函数

现在不少的php采集程序，用了下面的函数，需要的朋友可以参考下。

//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])) 
{ 
$new_content = preg_replace('/href=”\//', ‘href=”‘.$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]); 
} 

//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]; 
}