验证码
<?php
add_action("wpcf7_init", function () {
if (function_exists('wpcf7_add_form_tag')) {
wpcf7_add_form_tag("validate-code", "validate_code_handler", true);
wpcf7_add_form_tag("validate-code*", "validate_code_handler", true);
}
});
function validate_code_handler($tag)
{
$tag = new WPCF7_FormTag($tag);
if (empty($tag->name)) return '';
$atts = array();
if ($tag->is_required()) {
$atts['aria-required'] = 'true';
}
$validation_error = wpcf7_get_validation_error($tag->name);
$atts['aria-invalid'] = $validation_error ? 'true' : 'false';
$value = (string) reset($tag->values);
if (
$tag->has_option('placeholder')
or $tag->has_option('watermark')
) {
$atts['placeholder'] = $value;
$value = '';
}
$atts['name'] = $tag->name;
$atts['type'] = "text";
$atts['bind'] = $tag->get_option('bind', 'class', true);
$atts = wpcf7_format_atts($atts);
$html = sprintf(
'<span class="wpcf7-form-control-wrap validate-code %1$s"><input autocomplete="off" id="validate-code_input" %2$s />%3$s</span><div id="validate-code_image"><img src="/?get_validate_code=get_validate_code" /></div>',
sanitize_html_class($tag->name),
$atts,
$validation_error
);
$html .= '
<script>
jQuery(function($){
$("#validate-code_input").focus(function(){
$("#validate-code_image img").click()
})
$("#validate-code_image img").click(function(){
$(this).attr("src","/?get_validate_code=get_validate_code&time=' . time() . '")
})
});
</script>
';
return $html;
}
add_filter('wpcf7_validate_validate-code', "validate_code_validation_filter", 10, 2);
add_filter('wpcf7_validate_validate-code*', "validate_code_validation_filter", 10, 2);
function validate_code_validation_filter($result, $tag)
{
$name = $tag->name;
$value = isset($_POST[$name])
? trim(wp_unslash(strtr((string) $_POST[$name], "\n", " ")))
: '';
if ($value === '') {
$result->invalidate($tag, "请输入验证码!");
} else {
if (strcmp($value, $_SESSION['custom_validate-code']) <> 0) {
$result->invalidate($tag, '验证码错误');
}
}
return $result;
}
add_action('init', function () {
session_start();
if ($_GET['get_validate_code'] == 'get_validate_code') {
$ValidateCode = new ValidateCode();
$ValidateCode->doImg();
$_SESSION['custom_validate-code'] = $ValidateCode->getCode();
die;
} else if ($_GET['eeee'] == 'eeee') {
echo $_SESSION['custom_validate-code'];
die;
}
});
//验证码类
class ValidateCode
{
private $charset = '*+?abcdefghkmnprstuvwxyzABCDEFGHKMNPRSTUVWXYZ23456789'; //随机因子
private $code; //验证码
private $code_len = 6; //验证码长度
private $width = 200; //宽度
private $height = 50; //高度
private $img; //图形资源句柄
private $font; //指定的字体
private $fontsize = 20; //指定字体大小
private $fontcolor; //指定字体颜色
//构造方法初始化
public function __construct()
{
$this->font = WP_CONTENT_DIR . '/uploads/Fonts/elephant.ttf';
}
//生成随机码
private function createCode()
{
$_len = strlen($this->charset) - 1;
for ($i = 0; $i < $this->code_len; $i++) {
$this->code .= $this->charset[mt_rand(0, $_len)];
}
}
//生成背景
private function createBg()
{
$this->img = imagecreatetruecolor($this->width, $this->height);
$color = imagecolorallocate($this->img, mt_rand(0, 255), mt_rand(0, 255), mt_rand(0, 255));
imagefilledrectangle($this->img, 0, $this->height, $this->width, 0, $color);
}
//生成文字
private function createFont()
{
$_x = $this->width / $this->code_len;
for ($i = 0; $i < $this->code_len; $i++) {
$this->fontcolor = imagecolorallocate($this->img, mt_rand(0, 100), mt_rand(0, 100), mt_rand(0, 100));
imagettftext($this->img, $this->fontsize, mt_rand(-30, 30), $_x * $i + mt_rand(1, 5), $this->height / 1.4, $this->fontcolor, $this->font, $this->code[$i]);
}
}
//生成线条、雪花
private function createLine()
{
for ($i = 0; $i < 6; $i++) {
$color = imagecolorallocate($this->img, mt_rand(0, 156), mt_rand(0, 156), mt_rand(0, 156));
imageline($this->img, mt_rand(0, $this->width), mt_rand(0, $this->height), mt_rand(0, $this->width), mt_rand(0, $this->height), $color);
}
for ($i = 0; $i < 100; $i++) {
$color = imagecolorallocate($this->img, mt_rand(200, 255), mt_rand(200, 255), mt_rand(200, 255));
imagestring($this->img, mt_rand(1, 5), mt_rand(0, $this->width), mt_rand(0, $this->height), '*', $color);
}
}
//输出
private function outPut()
{
header('Content-type:image/png');
imagepng($this->img);
imagedestroy($this->img);
}
//对外生成
public function doImg()
{
$this->createBg();
$this->createCode();
$this->createLine();
$this->createFont();
$this->outPut();
}
//获取验证码
public function getCode()
{
// return strtolower($this->code);
return $this->code;
}
}
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