PHP函数库07：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 ( " /[\r\n]{1,}/isU " , " <br/>\r\n " , $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 ( ' /<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 ]; 
}