如何更改验证码的字体系列并在验证码背景中提供图像？

Question

如何更改验证码的字体系列并在验证码的背景中提供图像，请告诉我是否有人知道。 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

看一眼：

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

---

我这样使用它（包含的额外文件）：

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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包括这样：

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