用于完整url yoast的php

我是php新手。 我正在使用Wordpress和yoast

但是，yoast插件没有正确编写规范。我希望编写规范以便使用语法

<link rel="canonical" href="https://www.travelideology.com/about/">

试一试

试一试

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还可以尝试home\u url（）还可以尝试home\u url（）

<link rel="canonical" href="https:/about/">

function my_wpseo_canonical( $canonical ) {

    global $post;
    $attachment = get_post( $post->ID );

    $protocol = ($_SERVER['HTTPS'] && $_SERVER['HTTPS'] != "off") ? "https" : "http";
    $cleansed = $protocol . "://" . $_SERVER['HTTP_HOST'];
    $cleansed2 = get_permalink($attachment);
    $canonical = $cleansed . $cleansed2;
    return $canonical; 
}

add_filter( 'wpseo_canonical', 'my_wpseo_canonical' );

function my_wpseo_canonical( $canonical ) {

global $post;
$attachment = get_post( $post->ID );

    $protocol = ($_SERVER['HTTPS'] && $_SERVER['HTTPS'] != "off") ? "https" : "http";
$cleansed = $protocol . "://" .site_url(). $_SERVER['HTTP_HOST'];
$cleansed2 = get_permalink($attachment);
$canonical = $cleansed . $cleansed2;
return $canonical; 
    }