PHP generates alphanumeric verification code images

php generates alphanumeric verification code images

header ('Content-Type: image/png');
$image=imagecreatetruecolor(100, 30);
$color=imagecolorallocate($image, 255, 255, 255) ;
imagefill($image, 20, 20, $color);
//Contains only numbers
// for($i=0;$i<4;$i++){
 // $font=6;
 / / $x=rand(5,10)+$i*100/4;
 // $y=rand(8, 15);
 // $string=rand(0, 9);
 // $color= imagecolorallocate($image, rand(0,120), rand(0,120), rand(0,120));
 // imagestring($image, $font, $x, $y, $string, $color);
// }

//Containing numbers and letters
for($i=0;$i<4;$i++){
 $fontSize=6;
 $x=rand(5,10)+$i*100/4;
 $y=rand(5, 15);
 $data='abcdefghijklmnopqrstuvwxyz123456789';
 $string=substr($data,rand(0, strlen($data)),1);
 $color=imagecolorallocate($image, rand(0,120), rand(0,120), rand(0,120));
 imagestring($image, $fontSize, $x, $y, $string, $color);
}
//interference point element
for($ i=0;$i<200;$i++){
 $pointColor=imagecolorallocate($image, rand(100, 255), rand(100, 255), rand(100, 255));
 imagesetpixel($image, rand(0, 100), rand(0, 30), $pointColor);
}
//Interference line elements
for($i=0;$i<2;$i++){
 $linePoint=imagecolorallocate($ image, rand(150, 255), rand(150, 255), rand(150, 255));
 imageline($image, rand(10, 50), rand(10, 20), rand(80,90) , rand(15, 25), $linePoint);
}
imagepng($image);
imagedestroy($image);
?>

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Verification code, php