我试图为WordPress创建的PHP联系人表单有问题。我在$headers 上面写着syntax error, unexpected \'\' 但我不知道为什么，因为我觉得这是正确的。我也认为function my_form_message(){ 未正确关闭。任何帮助都会很好。谢谢

// Form markup
 function html_form_code() { ?>

 <form action="<?php esc_url( $_SERVER[\'REQUEST_URI\'] ); ?>" method="post">
   <p>Your Name (required)<br />
     <input type="text" name="cf-name" pattern="[a-zA-Z0-9 ]+" value="<?php isset( $_POST["cf-name"] ) ? esc_attr( $_POST["cf-name"] ) : \'\'; ?>" size="40" />
   </p>
   <p>Your Email (required)<br />
     <input type="email" name="cf-email" value="<?php isset( $_POST["cf-email"] ) ? esc_attr( $_POST["cf-email"] ) : \'\'; ?>" size="40" />
   </p>
   <p>Your Message (required)<br />
     <textarea rows="10" cols="35" name="cf-message"><?php isset( $_POST["cf-message"] ) ? esc_attr( $_POST["cf-message"] ) : \'\'; ?></textarea>
   </p>
   <p><input type="submit" name="cf-submitted" value="Send"/></p>
 </form>

 <?php }

// Form validation
 function my_validate_form() {

  $errors = new WP_Error();

  if ( isset( $_POST[ \'content\' ] ) && $_POST[ \'content\' ] !== \'\' ) {
    $errors->add( \'cheater\', \'Sorry, this field should not be filled. Are you trying to cheat?\' );
  }

  if ( isset( $_POST[ \'cf-name\' ] ) && $_POST[ \'cf-name\' ] == \'\' ) {
    $errors->add(\'name_error\', \'Please fill in a valid name.\' );
  }

  if ( isset( $_POST[ \'cf-email\' ] ) && $_POST[ \'cf-email\' ] == \'\' ) {
    $errors->add(\'email_error\', \'Please fill in a valid email.\' );
  }

  if ( isset( $_POST[ \'cf-message\' ] ) && $_POST[ \'cf-message\' ] == \'\' ) {
    $errors->add(\'message_error\', \'Please fill in a valid message.\' );
  }

  return $errors;
}

// Form delivery
 function deliver_mail( $args = array() ) {

  // This $default array is a way to initialize some default values that will be overwritten by our $args array.
  // We could add more keys as we see fit and it\'s a nice way to see what parameter we are using in our function.
  // It will only be overwritten with the values of our $args array if the keys are present in $args.
  // This uses WP wp_parse_args() function.
  $defaults = array(
    \'name\'    => \'\',
    \'email\'   => \'\',
    \'message\' => \'\',
    \'to\'      => get_option( \'admin_email\' ), // get the administrator\'s email address
  );

  $args = wp_parse_args( $args, $defaults );

  $headers = "From: $args[\'name\'] <$args[\'email\']>" . "\\r\\n";

  // Send email returns true on success, false otherwise
  if( wp_mail( $args[\'to\'], $args[\'message\'], $headers ) ) {
    return;
  }
  else {
    return false;
  }
}

// Form sanitize
function my_sanitize_field( $input ){

  return trim( stripslashes( sanitize_text_field ( $input ) ) );

}

// Form succsess message
function my_form_message(){

  global $errors;
  if( is_wp_errors( $errors ) && empty( $errors->errors ) ){

    echo \'<div class="cf-success">\';
    echo \'<p>Thank you for contacting us \'. $_POST[\'cf-name\'] .\', a member of our team will be in touch with you shortly.</p>\';
    echo \'</div>\';

    //Empty $_POST because we already sent email
    $_POST = \'\';

  }
  else {

  if( is_wp_errors( $errors ) && ! empty( $errors->errors ) ){

    $error_messages = $errors->get_error_messages();
    foreach( $error_messages as $k => $message ){
        echo \'<div class="cf-error \' . $k . \'">\';
        echo \'<p>\' . $message . \'</p>\';
        echo \'</div>\';

    }

  }

}

// Form shortcode
add_shortcode( \'contact_form\', \'cf_contact_form\' );
function cf_contact_form() {

  ob_start();

  my_form_message();
  html_form_code();

  return ob_get_clean();
}

// Error validation
add_action( \'init\', \'my_cf_form\');
function my_cf_form(){

  if( isset( $_POST[\'cf-submitted\'] ) ) {

    global $errors;
    $errors = my_validate_form();
    if( empty( $errors->errors ) ){

       $args = array(
         \'name\'    => my_sanitize_field( $_POST[\'cf-name\'] ),
         \'email\'   => my_sanitize_field( $_POST[\'cf-email\'] ),
         \'message\' => my_sanitize_field( $_POST[\'cf-message\'] ),
       );
       deliver_mail( $args );
    }
    else {
      return $errors;
    }
  }
}