Detailed explanation of the usage of get_header() to obtain the header function in WordPress development, wordpressheader_PHP tutorial

Detailed explanation of the usage of get_header() to obtain the header function in WordPress development, wordpressheader

Detailed explanation of the meaning of the function
Call the header.php file from the current theme. Isn't it very simple? Well, if you are a newbie, I would like to remind you that the get here is slightly different from the get in get_children() and get_category.

get_header function declaration (definition)
In the past, when I wrote articles, I rarely wrote the code of function definitions. Later, when I read it, I found that this habit was not very good, so I decided that as long as the space allowed, I would post the function topic to make it easier for me to read it.
The get_header function is declared (defined) around lines 24 – 36 of the wp=include/general-template.php file.

function get_header( $name = null ) {
 do_action( 'get_header', $name );
 
 $templates = array();
 if ( isset($name) )
 $templates[] = "header-{$name}.php";
 
 $templates[] = 'header.php';
 
 // Backward compat code will be removed in a future release
 if ('' == locate_template($templates, true))
 load_template( ABSPATH . WPINC . '/theme-compat/header.php');
}

Usage of get_header function

<&#63;php get_header( $name ); &#63;>

It’s very simple. From the function declaration above, we can also see that the function only accepts one variable as a parameter.

Parameter explanation
$name, as we can see from the function declaration above, $name is a string variable used to call the header’s alias template,
For example $name = “ab”;
That’s how we are

<&#63;php 
  $name = “ab”
  get_header( $name ); 
 
&#63;>

This will call the header-ab.php file as the header file.

Example:

1. Simple 404 page

The following code is a simple template file specifically designed to display "HTTP 404: Not Found" errors (this file should be included in your theme and named 404.php)

<&#63;php get_header(); &#63;>
<h2>Error 404 - Not Found</h2>
<&#63;php get_sidebar(); &#63;>
<&#63;php get_footer(); &#63;>

2. Various heads

Show different headers for different pages

<&#63;php
if ( is_home() ) :
 get_header( 'home' );
elseif ( is_404() ) :
 get_header( '404' );
else :
 get_header();
endif;
&#63;>

These headers for home and 404 should be named header-home.php and header-404.php respectively.

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