php生成各种验证码

Posted 2021-01-31 栖息地

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```<script type="text/javascript" src="jquery.min.js"></script>
<div id="main">
<div class="demo">
<h3>1、数字验证码</h3>
<p>验证码：<input type="text" class="input" id="code_num" name="code_num" maxlength="4" /> <img src="code.php?act=num" onclick="javascript:this.src=this.src + ‘?t=‘ +Math.random();" id="getcode_num" title="看不清，点击换一张" align="absmiddle"></p>
<p><input type="button" class="btn" id="chk_num" value="提交" /></p>
</div>
<div class="demo">
<h3>2、数字+字母验证码</h3>
<p>验证码：<input type="text" class="input" id="code_char" maxlength="4" /> <img src="code.php?act=char" onclick="javascript:this.src=this.src + ‘?t=‘ +Math.random();" id="getcode_char" title="看不清，点击换一张" align="absmiddle"></p>
<p><input type="button" class="btn" id="chk_char" value="提交" /></p>
</div>
<div class="demo">
<h3>3、中文验证码</h3>
<p>验证码：<input type="text" class="input" id="code_zh" maxlength="4" /> <img src="code.php?act=zh" onclick="javascript:this.src=this.src + ‘?t=‘ +Math.random();" id="getcode_zh" title="看不清，点击换一张" align="absmiddle"></p>
<p><input type="button" class="btn" id="chk_zh" value="提交" /></p>
</div>
<div class="demo">
<h3>4、仿google验证码</h3>
<p>验证码：<input type="text" class="input" id="code_gg" maxlength="4" /> <img src="code.php?act=gg" onclick="javascript:this.src=this.src + ‘?t=‘ +Math.random();" id="getcode_gg" title="看不清，点击换一张" align="absmiddle"></p>
<p><input type="button" class="btn" id="chk_gg" value="提交" /></p>
</div>
<div class="demo">
<h3>5、算术验证码</h3>
<p>验证码：<input type="text" class="input" id="code_math" maxlength="4" /> <img src="code.php?act=math" onclick="javascript:this.src=this.src + ‘?t=‘ +Math.random();" id="getcode_math" title="看不清，点击换一张" align="absmiddle"></p>
<p><input type="button" class="btn" id="chk_math" value="提交" /></p>
</div>
</div>



<a name=‘code.php‘></a>
code.php

<?php
session_start();
$act = isset($_GET[‘act‘]) ? $_GET[‘act‘] : "";
if ($act == "char"){
getCharCode(4,60,20);
}elseif ($act == "math"){
getMathCode(100, 24);
}elseif ($act == "num"){
getNumCode(4,60,20);
}elseif ($act == "zh"){
getZhCode();
}else {
//输出调用
$checkcode = make_rand(4);
$_SESSION[‘helloweba_gg‘]=strtolower($checkcode);
getAuthImage($checkcode);
}
function getCharCode($num,$w,$h) {
// 去掉了 0 1 O l 等
$str = "23456789abcdefghijkmnpqrstuvwxyz";
$code = ‘‘;
for ($i = 0; $i < $num; $i++) {
$code .= $str[mt_rand(0, strlen($str)-1)];
}
//将生成的验证码写入session，备验证页面使用
$_SESSION["helloweba_char"] = $code;
//创建图片，定义颜色值
Header("Content-type: image/PNG");
$im = imagecreate($w, $h);
$black = imagecolorallocate($im, mt_rand(0, 200), mt_rand(0, 120), mt_rand(0, 120));
$gray = imagecolorallocate($im, 118, 151, 199);
$bgcolor = imagecolorallocate($im, 235, 236, 237);

//画背景
imagefilledrectangle($im, 0, 0, $w, $h, $bgcolor);
//画边框
imagerectangle($im, 0, 0, $w-1, $h-1, $gray);
//imagefill($im, 0, 0, $bgcolor);
//在画布上随机生成大量点，起干扰作用;
for ($i = 0; $i &lt; 80; $i++) {
    imagesetpixel($im, rand(0, $w), rand(0, $h), $black);
}
//将字符随机显示在画布上,字符的水平间距和位置都按一定波动范围随机生成
$strx = rand(3, 8);
for ($i = 0; $i &lt; $num; $i++) {
    $strpos = rand(1, 6);
    imagestring($im, 5, $strx, $strpos, substr($code, $i, 1), $black);
    $strx += rand(8, 14);
}
imagepng($im);
imagedestroy($im);

}function getMathCode($w, $h) {
$im = imagecreate($w, $h);

//imagecolorallocate($im, 14, 114, 180); // background color
$red = imagecolorallocate($im, 255, 0, 0);
$white = imagecolorallocate($im, 255, 255, 255);

$num1 = rand(1, 20);
$num2 = rand(1, 20);

$_SESSION[‘helloweba_math‘] = $num1 + $num2;

$gray = imagecolorallocate($im, 118, 151, 199);
$black = imagecolorallocate($im, mt_rand(0, 100), mt_rand(0, 100), mt_rand(0, 100));

//画背景
imagefilledrectangle($im, 0, 0, 100, 24, $black);
//在画布上随机生成大量点，起干扰作用;
for ($i = 0; $i &lt; 80; $i++) {
    imagesetpixel($im, rand(0, $w), rand(0, $h), $gray);
}

imagestring($im, 5, 5, 4, $num1, $red);
imagestring($im, 5, 30, 3, "+", $red);
imagestring($im, 5, 45, 4, $num2, $red);
imagestring($im, 5, 70, 3, "=", $red);
imagestring($im, 5, 80, 2, "?", $white);

header("Content-type: image/png");
imagepng($im);
imagedestroy($im);

}function getNumCode($num,$w,$h) {
$code = "";
for ($i = 0; $i < $num; $i++) {
$code .= rand(0, 9);
}
//4位验证码也可以用rand(1000,9999)直接生成
//将生成的验证码写入session，备验证页面使用
$_SESSION["helloweba_num"] = $code;
//创建图片，定义颜色值
Header("Content-type: image/PNG");
$im = imagecreate($w, $h);
$black = imagecolorallocate($im, 0, 0, 0);
$gray = imagecolorallocate($im, 200, 200, 200);
$bgcolor = imagecolorallocate($im, 255, 255, 255);

imagefill($im, 0, 0, $gray);

//画边框
imagerectangle($im, 0, 0, $w-1, $h-1, $black);

//随机绘制两条虚线，起干扰作用
$style = array (
    $black,
    $black,
    $black,
    $black,
    $black,
    $gray,
    $gray,
    $gray,
    $gray,
    $gray
);
imagesetstyle($im, $style);
$y1 = rand(0, $h);
$y2 = rand(0, $h);
$y3 = rand(0, $h);
$y4 = rand(0, $h);
imageline($im, 0, $y1, $w, $y3, IMG_COLOR_STYLED);
imageline($im, 0, $y2, $w, $y4, IMG_COLOR_STYLED);

//在画布上随机生成大量黑点，起干扰作用;
for ($i = 0; $i &lt; 80; $i++) {
    imagesetpixel($im, rand(0, $w), rand(0, $h), $black);
}
//将数字随机显示在画布上,字符的水平间距和位置都按一定波动范围随机生成
$strx = rand(3, 8);
for ($i = 0; $i &lt; $num; $i++) {
    $strpos = rand(1, 6);
    imagestring($im, 5, $strx, $strpos, substr($code, $i, 1), $black);
    $strx += rand(8, 12);
}
imagepng($im);
imagedestroy($im);

}

$font = ‘t1.ttf‘;

for ($i=0;$i&lt;strlen($text);$i++)
{
    $tmp =substr($text,$i,1);
    $array = array(-1,1);
    $p = array_rand($array);
    $an = $array[$p]*mt_rand(1,10);//角度
    $size = 28;
    imagettftext($im, $size, $an, 15+$i*$size, 35, $text_c, $font, $tmp);

}$distortion_im = imagecreatetruecolor ($im_x, $im_y);

imagefill($distortion_im, 16, 13, $buttum_c);
for ( $i=0; $i<$im_x; $i++) {
for ( $j=0; $j<$im_y; $j++) {
$rgb = imagecolorat($im, $i , $j);
if( (int)($i+20+sin($j/$im_y2M_PI)10) <= imagesx($distortion_im)&& (int)($i+20+sin($j/$im_y2M_PI)10) >=0 ) {
imagesetpixel ($distortion_im, (int)($i+10+sin($j/$im_y2M_PI-M_PI0.1)4) , $j , $rgb);
}
}
}
//加入干扰象素;
$count = 160;//干扰像素的数量
for($i=0; $i<$count; $i++){
$randcolor = ImageColorallocate($distortion_im,mt_rand(0,255),mt_rand(0,255),mt_rand(0,255));
imagesetpixel($distortion_im, mt_rand()%$im_x , mt_rand()%$im_y , $randcolor);
}

$rand = mt_rand(5,30);
$rand1 = mt_rand(15,25);
$rand2 = mt_rand(5,10);
for ($yy=$rand; $yy<=+$rand+2; $yy++){
for ($px=-80;$px<=80;$px=$px+0.1)
{
$x=$px/$rand1;
if ($x!=0)
{
$y=sin($x);
}
$py=$y*$rand2;

imagesetpixel($distortion_im, $px+80, $py+$yy, $text_c);

}
}

//设置文件头;
Header("Content-type: image/JPEG");

//以PNG格式将图像输出到浏览器或文件;
ImagePNG($distortion_im);

//销毁一图像,释放与image关联的内存;
ImageDestroy($distortion_im);
ImageDestroy($im);
}

function make_rand($length="32"){//验证码文字生成函数
$str="ABCDEFGHIJKLMNOPQRSTUVWXYZ";
$result="";
for($i=0;$i<$length;$i++){
$num[$i]=rand(0,25);
$result.=$str[$num[$i]];
}
return $result;
}



<a name=‘check_code.php‘></a>
check_code.php

<?php
session_start();

$action = $_GET[‘act‘];
$code = trim($_POST[‘code‘]);
if($action==‘num‘){ //检验数字验证码
if($code==$_SESSION["helloweba_num"]){
echo ‘OK‘;
}
}elseif($action==‘char‘){
if($code==$_SESSION["helloweba_char"]){
echo ‘OK‘;
}
}elseif($action==‘zh‘){
$code = uniDecode($code,‘utf-8‘);
$ses = iconv(‘gbk‘,‘utf-8‘,$_SESSION["helloweba_zh"]);
if($code==$ses){
echo ‘OK‘;
}
}elseif($action==‘gg‘){
//echo $_SESSION["helloweba_gg"];exit;
if(strtolower($code)==$_SESSION["helloweba_gg"]){
echo ‘OK‘;
}
}elseif($action==‘math‘){
if($code==$_SESSION["helloweba_math"]){
echo ‘OK‘;
}
}else{

}

//处理接收中文字符串
function uniDecode($str, $charcode) {
$text = preg_replace_callback("/%u[0-9A-Za-z]{4}/", toUtf8, $str);
return mb_convert_encoding($text, $charcode, ‘utf-8‘);
}
function toUtf8($ar) {
foreach ($ar as $val) {
$val = intval(substr($val, 2), 16);
if ($val < 0x7F) { // 0000-007F
$c .= chr($val);
}
elseif ($val < 0x800) { // 0080-0800
$c .= chr(0xC0 | ($val / 64));
$c .= chr(0x80 | ($val % 64));
} else { // 0800-FFFF
$c .= chr(0xE0 | (($val / 64) / 64));
$c .= chr(0x80 | (($val / 64) % 64));
$c .= chr(0x80 | ($val % 64));
}
}
return $c;
}
?>

```

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