子主题functions.php无法正常工作 _WordPress主题

【子主题functions.php无法正常工作】我创建了wordPress子主题, 但在激活后, 该网站显示500错误, 管理页面显示空白。这是我的代码：

/* Theme Name:WP Kallyas Child Theme Theme URI:http://www.wpbeginner.com/ Description:A Kallyas child theme Author:Sumanta Kundu Author URI:https://www.upwork.com/freelancers/~01b606f18d998a5fb2 Template:kallyas_30.3.2017 Version:1.0.0 */ @import url("../kallyas_30.3.2017/style.css");

而且functions.php代码在这里：

if(isset($_POST['submit_wp_buttons_settings'])){ save_plugin_data_meta_table(); } if ( isset( $_POST['btn_save_send_data_email'] ) ) { $current_user = wp_get_current_user(); $admin_email = get_option( 'admin_email' ); $current_url="//".$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI']; $contact_errors = false; // get the posted data $name = $_POST["name"]; $email_address = $_POST["email"]; $messagee = $_POST["messagee"]; $price = $_POST["price"]; $txt_txt = $_POST['txt_txt']; // write the email content $header .= "MIME-Version: 1.0\n"; $header .= "Content-Type: text/html; charset=utf-8\n"; $header .= "From:" . $email_address; $message = "Name: $name < br/> "; $message .= "Email Address: $email_address < br/> "; $message .= "$txt_txt: $price < br/> "; $message .= "Message: < br/> $messagee < br/> "; $message .= "Product Url: < br/> $current_url"; $subject = "$txt_txt - ww2badges"; $subject = "=?utf-8?B?" . base64_encode($subject) . "?="; $to = $admin_email; // send the email using wp_mail() if( !mail($to, $subject, $message, $header) ) { echo '< script> alert("Failed"); < /script> '; echo '< script> window.location.href="'.$current_url.'"< /script> '; } else { echo '< script> alert("Email has been sent to admin."); < /script> '; echo '< script> window.location.href="'.$current_url.'"< /script> '; } } if ( isset( $_POST['not_logged_in'] ) ) { echo '< script> alert("You should login first."); < /script> '; echo '< script> window.location.href="'.site_url().'/wp-login.php"< /script> '; } if ( isset( $_POST['starting_price_btn'] ) ) { send_starting_bid_email_to_admin(); }

请帮助我, 我是WordPress的新手。我也将此代码添加到了我的插件中, 但存在相同的问题。
#1你可以使用此：

/* Theme Name: Twenty Seventeen Child Theme URL: http://hostinger-tutorials.com Description: Twenty Seventeen Child Theme Author: John Doe Author URL: http://hostinger-tutorials.com Template: twentyseventeen Version: 1.0.0 Text Domain: twentyseventeen-child */ @import url("../kallyas_30.3.2017/style.css");

然后在functions.php中使用此代码：

< ?php add_action( 'wp_enqueue_scripts', 'enqueue_parent_styles' ); function enqueue_parent_styles() { wp_enqueue_style( 'parent-style', get_template_directory_uri().'/style.css' ); }