//首先生成4位驗證碼
//開啟session
session_start();
//數(shù)組集合
$arr = array_merge(range(0,9),range('a','z'),range('A','Z'));
//打亂數(shù)組
shuffle($arr);
//截取4位驗證碼
$code = array_slice($arr,0,4);
//全部轉(zhuǎn)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(chuàng)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(jié)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($_SESSION['code']);
//如果提交的驗證碼跟session里面存的一樣及認(rèn)證成功
if($_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(guān)于php結(jié)合GD庫簡單實現(xiàn)驗證碼的示例代碼的文章就介紹到這了,更多相關(guān)php GD庫驗證碼內(nèi)容請搜索腳本之家以前的文章或繼續(xù)瀏覽下面的相關(guān)文章希望大家以后多多支持腳本之家！
