PHP reads the phone number from the database and generates a picture_PHP tutorial

$id=$_GET[id];
include("admin/config.php");
$sql="select * from user where id=$id";
$data=mysql_fetch_array(mysql_query ($sql));
$p=SBC_DBC($data[Phone],1);
function get_str($str,$strlen=16) {
$str=stripslashes($str);
for($i=0;$i<$strlen;$i++)
if(ord(substr($str,$i,1))>0xa0) $j++;
if($ j%2!=0) $strlen++;
$tmp_str=substr($str,0,$strlen);
return $tmp_str;
}
if($p<>'' ){
//Generate a 5-digit digital image
Header("Content-type:image/png"); //Tell the browser that the following data is an image, rather than displaying it as text

//Define image width and height
$nwidth=120;
$nheight=25;
$im=@imagecreate($nwidth,$nheight) or die("Can't initialize new GD image stream"); ​​//Create image

//Picture color settings
$background_color=imagecolorallocate($im,255,255,255); //Matching color
$text_color=imagecolorallocate($im,23 ,14,91);

//Draw the image border
imagefilledrectangle($im,0,0,$nwidth-1,$nheight-1,$background); //Color the rectangular area
imagerectangle($im,0,0,$nwidth-1,$nheight-1,$background_color); //Draw a rectangle

//srand((double)microtime()*1000000); // Get the millionth of a second value of the current time, using the millionth of a second at the time of execution as the random seed
//$randval=rand();
$randval=$p; //5 digits Number
imagestring($im,8,10,2,$randval,$text_color); //Draw horizontal string


//Add interference factors
//for( $i=0;$i<478;$i++)
//{
//$randcolor=imagecolorallocate($im,rand(0,255),rand(0,255),rand(0,255));
//imagesetpixel($im,rand()%100,rand()%30,$randcolor); //Point
//}
//imagestring($im,3,5,5," A Simple Text String",$text_color);
//imageinterlace($im,1);
imagepng($im); //Create a png graphic
imagedestroy($im); //End Graphic

}else{
echo "The merchant did not enter a phone number";
}

?>