常用PHP函数收集

将IP最后一位替换为星号：eregi_replace('/((?:/d+/.){3})/d+/',"//1*",$ip)

生成随机字符串

<   ? php
function  genRandomString(len) 
{ 
chars  =   array ( 
" a " ,   " b " ,   " c " ,   " d " ,   " e " ,   " f " ,   " g " ,   " h " ,   " i " ,   " j " ,   " k " ,  
" l " ,   " m " ,   " n " ,   " o " ,   " p " ,   " q " ,   " r " ,   " s " ,   " t " ,   " u " ,   " v " ,  
" w " ,   " x " ,   " y " ,   " z " ,   " A " ,   " B " ,   " C " ,   " D " ,   " E " ,   " F " ,   " G " ,  
" H " ,   " I " ,   " J " ,   " K " ,   " L " ,   " M " ,   " N " ,   " O " ,   " P " ,   " Q " ,   " R " ,  
" S " ,   " T " ,   " U " ,   " V " ,   " W " ,   " X " ,   " Y " ,   " Z " ,   " 0 " ,   " 1 " ,   " 2 " ,  
" 3 " ,   " 4 " ,   " 5 " ,   " 6 " ,   " 7 " ,   " 8 " ,   " 9 "  
); 
charsLen  =   count (chars)  -   1 ; 

shuffle (chars);  //  将数组打乱 

output  =   "" ; 
for  (i = 0 ; i < len; i ++ ) 
{ 
output  .=  chars[ mt_rand ( 0 ,  charsLen)]; 
} 

return  output; 

} 

str  =  genRandomString( 25 ); 
str  .=   " " ; 
str  .=  genRandomString( 25 ); 
str  .=   " " ; 
str  .=  genRandomString( 25 ); 

echo  str; 
?>

php
/*  Generate Password
* Length : 8
*/
str  =   " 0123456789abcdefghijklmnopqrstuvwxyz " ;  //  输出字符集 
n  =   8 ;  //  输出串长度 
len  =   strlen (str) - 1 ;
for (j = 0  ; j < 200  ; j ++ ){
for (i = 0  ; i < n; i ++ ){
s  .=  str[ rand ( 0 , len)]; 
}
echo  s  .   "
" ;
s  =   "" ; 
}
?>


function  SnRndCode( $length ) 
{ 
$possible   =   ' 0123456789 ' .  
              ' abcdefghijklmnopqrstuvwxyz ' .  
              ' ABCDEFGHIJKLMNOPQRSTUVWXYZ ' ; 
$str   =   '' ; 
while ( strlen ( $str )  <   $length ) 
{ 
   $str   .=   substr ( $possible ,  ( rand ()  %   strlen ( $possible )) ,   1 ); 
} 
return ( $str ); 
}
?>

本文转自[Goaler ' s BLOG]：http://blog.goalercn.com/blogview.asp?logID=451

 

function  utf_substr( $str , $len )
{
     for ( $i = 0 ; $i < $len ; $i ++ )
    {
         $temp_str = substr ( $str , 0 , 1 );
         if ( ord ( $temp_str )  >   127 ){
             $i ++ ;
         if ( $i < $len )    {
             $new_str [] = substr ( $str , 0 , 3 );
             $str = substr ( $str , 3 );
            }
        }
     else  {
         $new_str [] = substr ( $str , 0 , 1 );
         $str = substr ( $str , 1 );
        }
    }
     return   join ( $new_str );
}

 

function  HilightKeyword( $str , $strkey ) {
     $ks   =   explode ( "   " , $strkey );
     if ( strpos ( $strkey , " , " )){
         $ks   =   explode ( " , " , $strkey );
    }
     foreach ( $ks   as   $k ){
         $k   =   trim ( $k );
         if ( $k == "" )  continue ;
         if ( ord ( $k [ 0 ]) > 0x80   &&   strlen ( $k ) < 3 )  continue ;
        
         preg_match_all ( ' / ' . $k . ' /i ' , $str , $m );
        
         for ( $i = 0 ; $i < count ( $m [ 0 ]); $i ++ ) {
             $str   =   eregi_replace ( $m [ 0 ][ $i ] , " " . $m [ 0 ][ $i ] . " " , $str );
        }
    }
     return   $str ;
}

本文转自[Goaler ' s BLOG]：http://blog.goalercn.com/blogview.asp?logID=451

 

function  outHTML( $str ) {
      if ( ! empty ( $str )) {
         // $str = str_replace("&", "&",$str);
         $str   =   eregi_replace ( " < " ,   " < " , $str );
         $str   =   eregi_replace ( " > " ,   " > " , $str );
         $str   =   eregi_replace ( chr ( 34 ) ,   " " " , $str );
         $str   =   eregi_replace ( chr ( 13 ) ,   "
" , $str );
     }
     return   $str ;
}

function  inHTML( $str ) {
      if ( ! empty ( $str )) {
         // $str = str_replace("&", "&",$str);
         $str   =   eregi_replace ( " < " ,   " < " , $str );
         $str   =   eregi_replace ( " > " ,   " > " , $str );
         $str   =   eregi_replace ( " " " , chr ( 34 ) , $str );
         $str   =   eregi_replace ( "
" , chr ( 13 ) , $str );
         $str   =   eregi_replace ( " " , chr ( 13 ) , $str );
         $str   =   eregi_replace ( "
" , chr ( 13 ) , $str );
         $str   =   eregi_replace ( "

" , chr ( 13 ) , $str );
         $str   =   eregi_replace ( "

" , '' , $str );
     }
     return   $str ;
}

本文转自[Goaler ' s BLOG]：http://blog.goalercn.com/blogview.asp?logID=451

 

function geturl()
... {
    if(!empty($_SERVER['REQUEST_URI']))...{
        $scriptName = $_SERVER['REQUEST_URI'];
        $nowurl = $scriptName;
    }
    else
    ...{
        $scriptName = $_SERVER['PHP_SELF'];
        if($_SERVER['QUERY_STRING']=='')
            $nowurl = $scriptName;
        else
            $nowurl = $scriptName.'?'.$_SERVER['QUERY_STRING'];
    }
    return $nowurl;
}

本文转自[Goaler ' s BLOG]：http://blog.goalercn.com/blogview.asp?logID=451

 

function  fliterstring( $str , $stype )
{
     if ( $stype   ==   ' i ' ) {
         if ( ! is_numeric ( $str )) {
             $str   =   false ;
        }
         else  {
             $str   =   $str ;
        }
    }
     else  {
         if  ( ! get_magic_quotes_gpc ()){
             $str   =   addslashes ( $str );
        }
         else  {
             $str   =   $str ;
        }
    }
     return   $str ;
}

function  outputstring( $str ) {
     if  ( ! get_magic_quotes_gpc ()){
         $str   =   stripslashes ( $str );
    }
     else  {
         $str   =   $str ;
    }
     return   $str ;
}

本文转自[Goaler ' s BLOG]：http://blog.goalercn.com/blogview.asp?logID=451

// PHP获文件扩展名三法
//方法一: 
function  extend_1( $file_name ){ 
  $retval = "" ; 
  $pt = strrpos ( $file_name ,   " . " ); 
  if  ( $pt )  $retval = substr ( $file_name ,   $pt + 1 ,   strlen ( $file_name )  -   $pt ); 
  return  ( $retval ); 
}

// 方法二 
function  extend_2( $file_name ) 
{ 
$extend   =   pathinfo ( $file_name ); 
$extend   =   strtolower ( $extend [ " extension " ]); 
return   $extend ; 
}

// 方法三 
function  extend_3( $file_name ) 
{ 
$extend   = explode ( " . "   ,   $file_name ); 
$va = count ( $extend ) - 1 ; 
return   $extend [ $va ]; 
}

$a = extend_1( " f1.txt " );
echo   " ft.txt的扩展名为 " . $a . "
" ;

$a = extend_2( " f1.txt " );
echo   " ft.txt的扩展名为 " . $a . "
" ;

$a = extend_3( " f1.txt " );
echo   " ft.txt的扩展名为 " . $a . "
" ;

本文转自[Goaler ' s BLOG]：http://blog.goalercn.com/blogview.asp?logID=451

 

 

function  IsAllowUserIP( $iplist ,   $userip )
{
if  ( empty ( $iplist ) or  empty ( $userip )) {
return   true ;
}
$iplist   =   str_replace ( " . " , " . " , implode ( " | " , $iplist ));
$iplist   =   preg_replace ( " /*+/ " , " d+ " , $iplist );
$patten   =   " /( " . $iplist . " )/ " ;
if  ( preg_match ( $patten , $userip )) {
return   false ;
}
return   true ;
}
$iplist   =   array ( ' 222.169.156.34 ' , ' 127.0.0.2 ' );
$userip   =   ' 127.0.0.1 ' ;
if ( ! IsAllowUserIP( $iplist , $userip )){
echo   ' 你的IP被封 ' ;
}
本文转自[Goaler ' s BLOG]：http://blog.goalercn.com/blogview.asp?logID=451