描述：

加载自定义的模版文件

用法：

<?php load_template( $_template_file, $require_once ) ?>

参数：

$_template_file

(string) (必填) 模板路径.

默认值: None

$require_once

(bool) (可选) 使用 require_once 或 require.

默认值: true

示例：

 if ( $overridden_template = locate_template( 'some-template.php' ) ) {
   // locate_template() returns path to file
   // if either the child theme or the parent theme have overridden the template
   load_template( $overridden_template );
 } else {
   // If neither the child nor parent theme have overridden the template,
   // we load the template from the 'templates' sub-directory of the directory this file is in
   load_template( dirname( __FILE__ ) . '/templates/some-template.php' );
 }

源文件：

function load_template( $_template_file, $require_once = true ) {
    global $posts, $post, $wp_did_header, $wp_query, $wp_rewrite, $wpdb, $wp_version, $wp, $id, $comment, $user_ID;
 
    if ( is_array( $wp_query->query_vars ) ) {
        /*
         * This use of extract() cannot be removed. There are many possible ways that
         * templates could depend on variables that it creates existing, and no way to
         * detect and deprecate it.
         *
         * Passing the EXTR_SKIP flag is the safest option, ensuring globals and
         * function variables cannot be overwritten.
         */
        // phpcs:ignore WordPress.PHP.DontExtract.extract_extract
        extract( $wp_query->query_vars, EXTR_SKIP );
    }
 
    if ( isset( $s ) ) {
        $s = esc_attr( $s );
    }
 
    if ( $require_once ) {
        require_once( $_template_file );
    } else {
        require( $_template_file );
    }
}