php实现简单的图片验证码

这是最简单的图片验证码：

image.php

header("Content-type: image/png");
$string = "abcdefghijklmnopqrstuvwxyz0123456789";
for($i=0;$i    $pos = rand(0,36);
    $str .= $string{$pos};
}

$img_handle = ImageCreate (60, 20) or die ("Cannot Create image");
//Image size (x,y)
$back_color = ImageColorAllocate($img_handle, 255, 255, 255);
//Background color RBG
$txt_color = ImageColorAllocate($img_handle, 0, 0, 0);
//Text Color RBG
ImageString($img_handle, 31, 5, 0, $str, $txt_color);
Imagepng($img_handle);

session_start();
$_SESSION['img_number'] = $str;
?>

form.php

php实现简单的图片验证码
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php
验证码

这是最简单的图片验证码：

image.php


header("Content-type: image/png");
$string = "abcdefghijklmnopqrstuvwxyz0123456789";
for($i=0;$i    $pos = rand(0,36);
    $str .= $string{$pos};
}

$img_handle = ImageCreate (60, 20) or die ("Cannot Create image");
//Image size (x,y)
$back_color = ImageColorAllocate($img_handle, 255, 255, 255);
//Background color RBG
$txt_color = ImageColorAllocate($img_handle, 0, 0, 0);
//Text Color RBG
ImageString($img_handle, 31, 5, 0, $str, $txt_color);
Imagepng($img_handle);

session_start();
$_SESSION['img_number'] = $str;
?>

form.php


    @@##@@

result.php

session_start();
if($_SESSION['img_number'] != $_POST['num']){
    echo'The number you entered doesn't match the image.
    Try Again';
}else{
    echo'The numbers Match!
    Try Again';
}
?>

验证码, php