//首先生成4位驗證碼
//開啟session
session_start();
//數組集合
$arr = array_merge(range(0,9),range('a','z'),range('A','Z'));
//打亂數組
shuffle($arr);
//截取4位驗證碼
$code = array_slice($arr,0,4);
//全部轉為小寫
$code = strtolower(join('',$code));
var_dump($code);
//將code存入session
$_SESSION['code'] = $code;
3. 開啟GD庫畫圖
//創建畫布
$img = imagecreate(120,30);
//畫布顏色
$white = imagecolorallocate($img,255,255,255);
//自定義集中顏色
$c1 = imagecolorallocate($img,14,38,54);
$c2 = imagecolorallocate($img,63,5,16);
$c3 = imagecolorallocate($img,248,248,42);
$c4 = imagecolorallocate($img,0,0,0);
//點干擾素
for ($i = 0;$i 300;$i++){
imagesetpixel($img,rand(0,120),rand(0,30),$c1);
}
//虛線干擾素
for($j = 0;$j 200;$j++){
imagedashedline($img,rand(0,120),rand(0,30),rand(0,120),rand(0,30),$c2);
}
//線干擾素
for ($j = 0;$j 10;$j++){
imageline($img,rand(0,120),rand(0,30),rand(0,120),rand(0,30),$c2);
}
//字體，這個你路徑對了就OK
$font = "simhei.ttf";
//向圖像寫入文本
imagettftext($img,18,2,40,20,$c4,$font,$code);
//以jpg格式輸出，還有以png啥的，imagepng這個自己看
imagejpeg($img);
//結束之后銷毀，不銷毀也行，php自帶垃圾回收
imagedestroy($img);
?php
session_start();
print_r($_POST);
print_r($_SESSION['code']);
//如果提交的驗證碼跟session里面存的一樣及認證成功
if($_POST['n3'] == $_SESSION['code']){
echo '注冊成功';
}else{
echo '注冊失敗';
}
?>
!doctype html>
html lang="en">
head>
meta charset="UTF-8">
meta name="viewport"
content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
meta http-equiv="X-UA-Compatible" content="ie=edge">
title>Document/title>
/head>
body>
form action="" method="post">
input type="text" name="n1" placeholder="cc">
input type="text" name="n2" placeholder="s">
input type="text" name="n3">
!--這里點擊刷新驗證碼 -->
img src="xxx.php" onclick="this.src='index.php?'+Math.random()" alt="">
input type="submit" value="submit">
/form>
/body>
/html>
搞定完事。到此這篇關于php結合GD庫簡單實現驗證碼的示例代碼的文章就介紹到這了,更多相關php GD庫驗證碼內容請搜索腳本之家以前的文章或繼續瀏覽下面的相關文章希望大家以后多多支持腳本之家！
