需要将其编写为函数来创建插件，并使用模板页面中插件的操作挂钩

function my_frontend_custom_post( $new_post ) {

  <?php if ( isset( $_POST[\'submitted\'] ) && isset( $_POST[\'new_post_nonce_field\'] ) && wp_verify_nonce( $_POST[\'new_post_nonce_field\'], \'new_post_nonce_action\' ) ) {

    if ( trim( $_POST[\'post-title\'] ) === \'\' ) {
        $postingError .= \'Please insert a title. \';
        $hasError = true;
    } else {
        $postTitle = trim( $_POST[\'post-title\'] );
    }

    $new_post = array( array(
        \'post_content\'  =>  $_POST[\'post-content\'],
        \'post_title\'    =>  wp_strip_all_tags( $_POST[\'post-title\'] ),
        \'post_status\'   => \'publish\',
        \'post_type\'     => \'cpt\',
    );  

    if ( !$hasError == true ) {     

        $post_id = wp_insert_post( $new_post );
        wp_set_object_terms( $post_id, $_POST[\'post-categ\'], \'categories\' );

        if ( $post_id ) {
            wp_safe_redirect( home_url() );
            echo \'Succes\';
            exit;
        } // end - check if post\'s created and redirect to home_url
    } //end - if free of error insert_post and set_object categories

  } // end - first if wrapper
} // end - function
add_action( \'wp_insert_post\', \'my_frontend_custom_post\', 10, 1 );

function display_frontend_form() {

    <form id="new_post" method="POST" action="" enctype="multipart/form-data">

        <label for="post-title">The Title</label>
        <input id="post-title" name="post-title" type="text" />

        <label for="post-content">The Content</label>
        <textarea id="post-content" name="post-content"></textarea>

        <label for="post-categ">The Categories</label>
        <input id="post-categ" name="post-categ" type="text" />

    <?php wp_nonce_field( \'new_post_nonce_action\', \'new_post_nonce_field\' ); ?>

        <button type="submit">Publish</button>
        <input type="hidden" name="submitted" id="submitted" value="true" />

    </form>

}
add_action( \'show_form\', \'display_frontend_form\' );

do_action( \'show_form\'  );