PHP generates verification code images of numbers and letters, _PHP tutorial

php generates a verification code image of alphanumeric characters,

php generates a verification code image of alphanumeric characters

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header ('Content-Type: image/png');
$image=imagecreatetruecolor(100, 30);
$color=imagecolorallocate($image, 255, 255, 255);
imagefill($image, 20, 20, $color);
//只含有数字
// for($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);
// }

//含有数字和字母的
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, $color);
}
//干扰点元素
for($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), $pointColor);
}
//干扰线元素
for($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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