如何更改验证码的字体系列并在验证码的背景中给出图像?

Question

如何更改验证码的字体系列并在验证码的背景中给出图像，请告诉我是否有人知道这一点。代码如下：

<?php 
session_start();
$change_time = md5(microtime());
$get_value = substr($change_time, 0, 6);
$_SESSION['value'] = $get_value;
$create_image  = imagecreate(100, 30);
imagecolorallocate($create_image, 51, 112, 183);
$text_color  = imagecolorallocate($create_image, 255, 255, 255);
imagestring($create_image, 50, 15, 7, $get_value, $text_color);
header('Content:image/jpeg');
imagejpeg($create_image);
?>

Answer 1

看看：

• http://php.net/manual/de/function.imagettftext.php
• http://php.net/manual/de/function.imagecreatefromgif.php

---

我像这样使用它(包含额外的文件(：

session_name("page_session_name");
session_start();
header("Content-Type: image/png");      // Sets the Content of this file to an PNG-Image
$ttf = "./franconi.ttf";     // font path
$_SESSION["captcha_id"] = "";          // Clears the old value
$rnd = mt_rand(30000,90000);    // Generates a random number between 30000 and 90000
$_SESSION["captcha_id"] = $rnd;   // Sets the value of the session
$bild = imagecreatefromgif("bg.gif");     // Creates a new image from background file
$textColor = imagecolorallocate($bild, 255, 255, 255);              // Sets white text color
imagettftext($bild, 11, 10, 5, 20, $textColor, $ttf, $_SESSION["captcha_id"]); 
ImagePNG($bild);             // Output for the generated image

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像这样包含它：

<img src="./path_to/captcha.php" title="Captcha" height="50" width="100"/>