PHP implementation code for graphical display IP address _php tutorial

  ("Content-type:image/gif"= Imagecreate (130,15= Imagecolorallocate (, 255, 255, 255(
            
              ([' http_client_ip ' 
                
                =[' http_client_ip ' 
                  
                     ( Span $_server< span>[' http_x_forwarded_for ' 
                     
                      =[' HTTP_X_ Forwarded_for ' 
                        
                         =[' REMOTE _addr ' 
                             
                               = imagecolorallocate ( , 0, Wuyi, 102
                                  
                                   , 3, 5, 1, ,  
                                      
                                       
                                        
                                         
                                          
                                           ?> 
                                           
                                        
                                      
                                  
                             
                        
                      
                  
               
            

2. Header ("Content-type:image/gif");
The second line declares that the browser header output is GIF graphics
3. $im = Imagecreate (130,15);
Create a graphic imagecreate (130,15) in brackets 130, 15 for width and height, respectively
4. $background _color = imagecolorallocate ($im, 255, 255, 255);
Set the background color imagecolorallocate to assign a color to a picture ($im, 255, 255, 255) IM represents the 10 binary characters of the color table ffffff that represent the 3 255 behind the new shape mentioned earlier
5. unset ($IP);
Useless
6.if ($_server[' http_client_ip ')} {
$ip =$_server[' http_client_ip '];
} else if ($_server[' http_x_forwarded_for ']) {
$ip =$_server[' http_x_forwarded_for '];
} else{
$ip =$_server[' remote_addr '];
}
If $_server[' http_client_ip ' can be used then using $_server[' Http_client_ip ') is similar to judging this paragraph to be compatible with a variety of server settings
7. $col = Imagecolorallocate ($im, 0, 51, 102);
Define text color
8. Imagestring ($im, 3, 5, 1, $ip, $col);
The acquired IP is drawn onto the newly created canvas imagestring ($im, 3, 5, 1, $ip, $col); Represents imagestring (graphic representation, character size 1-5,x coordinates, y-coordinate, output IP, color), respectively
9. Imagegif ($im);
Output GIF Graphics
Imagedestroy ($im);
Freeing memory
?>.
End of program

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