PHP Digital Operation Verification Code implementation codes, PHP digital Operation verification Code _php tutorial

Implementation code of PHP digital Operation verification Code, PHP digital Operation Verification Code

In this paper, the method of implementing digital operation verification Code in PHP is described, and the implementation method is as follows:

<?phpgetvalidate (100,30);   function Getvalidate ($w, $h) {$img = Imagecreate ($w, $h);  $gray = Imagecolorallocate ($img, 255,255,255);  $black = Imagecolorallocate ($img, Rand (0,200), Rand (0,200), Rand (0,200));  $red = Imagecolorallocate ($img, 255, 0, 0);  $white = Imagecolorallocate ($img, 255, 255, 255);  $green = imagecolorallocate ($img, 0, 255, 0);  $blue = imagecolorallocate ($img, 0, 0, 255);    Imagefilledrectangle ($img, 0, 0, +, $black);  for ($i = 0; $i <; $i + +) {Imagesetpixel ($img, rand (0, $w), rand (0, $h), $gray);  } $num 1 = rand (1,99);   $num 2 = rand (1,99);  Imagestring ($img, 5, 5, rand (1,10), $num 1, $red);  Imagestring ($img, 5,30,rand (1,10), Getrand (), $white);  Imagestring ($img, 5,45,rand (1,10), $num 2, $green);  Imagestring ($img, 5,65,rand (1,10), "=", $blue);      Imagestring ($img, 5,80,rand (1,10), "?", $red);  Header ("Content-type:image/png");  Imagepng ($IMG); Imagedestroy ($img);}  function Getrand () {$code = rand (0,1);      Switch ($code) {case 0:return "+"; BrEak      Case 1:return "-";    Break  Default: # code ... break; }}?>

Implementation results:

The above is the use of PHP to implement the digital Operation verification code method, I hope that everyone's learning is helpful.

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