我创建了一个wordpress插件。此插件显示wordpress主题中的提交表单。我在我的wp插件中使用这个php验证码:
function create_image() {
$md5_hash = md5(rand(0,999));
$security_code = substr($md5_hash, 15, 5);
$_SESSION["security_code"] = $security_code;
$width = 100;
$height = 35;
$image = ImageCreate($width, $height);
$white = ImageColorAllocate($image, 255, 255, 255);
$black = ImageColorAllocate($image, 2, 0, 0);
$blue = ImageColorAllocate($image, 87, 20, 186);
$grey = ImageColorAllocate($image, 204, 204, 204);
ImageFill($image, 0, 0, $blue);
ImageString($image, 5, 30, 8, $security_code, $white);
ImageRectangle($image,0,0,$width-1,$height-1,$grey);
header("Content-Type: image/jpeg");
Imagepng($image);
ImageDestroy($image);
}
并在img标签中使用验证码:
<img class="captcha" src="<?php create_image() ?>">
但是当我在我的主题中使用这个插件时,不要工作!
答案 0 :(得分:0)
当你渲染它时,你的图像标签会说
<img class="captcha" src="<<a whole bunch of binary stuff>>">
为什么呢?因为您的create_image()
函数使用Imagepng()
的单参数形式内联发出图像。
相反,您需要将图像发送到.png文件,然后在<img ... />
标记中提及该文件的名称。
您可以将功能的最后几行改为这样工作。
...
ImageRectangle($image,0,0,$width-1,$height-1,$grey);
$file = "tmp-" . rand() . ".png";
Imagepng($image, $file);
return "/" . $file;
}
这将使您的函数创建一个带有随机名称的png文件,然后返回该文件的路径以在<img .../>
标记中使用。
这需要一些调试。我编写它的方式,它假定您能够写入当前工作目录。您可能需要写入一些可供Web服务器访问的临时目录。
此外,这些图像文件将堆积起来。你需要做一些cron工作或其他东西来清理旧的。
答案 1 :(得分:-1)
试试这段代码..
<?php
function generateRandomString($length = 10) {
$characters = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
$randomString = '';
for ($i = 0; $i < $length; $i++) {
$randomString .= $characters[rand(0, strlen($characters) - 1)];
}
return $randomString;
}
function generateCaptchaImage($text = 'good'){
// Set the content-type
header('Content-Type: image/png');
$width = 200;
$height = 30;
// Create the image
$im = imagecreatetruecolor($width, $height);
// Create some colors
$white = imagecolorallocate($im, 255, 255, 255);
$grey = imagecolorallocate($im, 128, 128, 128);
$black = imagecolorallocate($im, 0, 0, 0);
imagefilledrectangle($im, 0, 0, 399, 29, $white);
//ADD NOISE - DRAW background squares
$square_count = 6;
for($i = 0; $i < $square_count; $i++){
$cx = rand(0,$width);
$cy = (int)rand(0, $width/2);
$h = $cy + (int)rand(0, $height/5);
$w = $cx + (int)rand($width/3, $width);
imagefilledrectangle($im, $cx, $cy, $w, $h, $white);
}
//ADD NOISE - DRAW ELLIPSES
$ellipse_count = 5;
for ($i = 0; $i < $ellipse_count; $i++) {
$cx = (int)rand(-1*($width/2), $width + ($width/2));
$cy = (int)rand(-1*($height/2), $height + ($height/2));
$h = (int)rand($height/2, 2*$height);
$w = (int)rand($width/2, 2*$width);
imageellipse($im, $cx, $cy, $w, $h, $grey);
}
// Replace path by your own font path
$font = 'ThisisKeSha.ttf';
// Add some shadow to the text
imagettftext($im, 20, 0, 11, 21, $grey, $font, $text);
// Add the text
imagettftext($im, 20, 0, 10, 20, $black, $font, $text);
// Using imagepng() results in clearer text compared with imagejpeg()
imagepng($im);
imagedestroy($im);
}
$randomString = generateRandomString();
generateCaptchaImage($randomString);
?>
仍然没有得到这个Good Solution参与演示