为 WordPress 搜索添加人机验证

11个月前发布

240

为了防止机器人频繁的使用搜索功能，那么可以给这个搜索功能增加一个人机验证！

把下面代码放到主题的functions.php文件里

代码：

function esc_search_captcha( $query, $error = true ) {
    	if ( is_search() && !is_admin() ) {
    		if ( ! isset( $_COOKIE['esc_search_captcha'] ) ) {
    			$query->is_search = false;
    			$query->query_vars['s'] = false;
    			$query->query['s'] = false;
     
    			if ( $error == true ){
    				//$query->is_404 = true;
    				if ( isset( $_POST['result'] ) ) {
    					if ( $_POST['result'] == $_COOKIE['result'] ) {
    						$_COOKIE['esc_search_captcha'] = 1;
    						setcookie('esc_search_captcha',1,0,'/');
    						echo '<script>location.reload();</script>';
    					}
    				}
     
    				$num1 = rand(1,50);
    				$num2 = rand(1,50);
    				$result = $num1+$num2;
    				$_COOKIE['result'] = $result;
    				setcookie('result',urldecode($result),0,'/');
    				?>
     
    				<html>
    				<head>
    				<meta charset="UTF-8">
    				<title>人机验证</title>
    				<style>
    				body{color: #333;text-align: center;font-size: 16px;}
    				.erphp-search-captcha{margin: 50px auto 15px;max-width: 250px;width: 100%;padding: 40px 20px;border: 1px solid #ddd;text-align: center;border-radius: 5px;}
    				.erphp-search-captcha form{margin: 0}
    				.erphp-search-captcha input{border: none;border-bottom: 1px solid #666;width: 50px;text-align: center;font-size: 16px;}
    				.erphp-search-captcha input:focus{outline: none;}
    				.erphp-search-captcha button{border: none;background: transparent;color: #ff5f33;cursor: pointer;}
    				.erphp-search-captcha button:focus{outline: none;}
    				a{color: #000;font-size: 12px;}
    				</style>
    				</head>
    				<body>
    				<div class="erphp-search-captcha">
    				<form action="" method="post"><?php echo $num1;?> + <?php echo $num2;?> = <input type="text" name="result" required /> <button type="submit">验证</button></form>
    				</div>
    				<a href="<?php echo home_url();?>">返回首页</a>
    				</body>
    				</html>
    				<?php
    				exit;
    			}
    		}
    	}
    }
    add_action( 'parse_query', 'esc_search_captcha' );

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