[WordPress] WordPress主题制作中自定义头部的相关PHP函数解析

<img src="<?php header_image(); ?>" width="<?php echo $header_image_width; ?>" height="<?php echo $header_image_height; ?>" alt="" />

function header_textcolor() { 

 echo get_header_textcolor(); 

} 

function get_header_image() { 

 $url = get_theme_mod( 'header_image', get_theme_support( 'custom-header', 'default-image' ) ); 

  

 if ( 'remove-header' == $url ) 

 return false; 

  

 if ( is_random_header_image() ) 

 $url = get_random_header_image(); 

  

 if ( is_ssl() ) 

 $url = str_replace( 'http://', 'https://', $url ); 

 else 

 $url = str_replace( 'https://', 'http://', $url ); 

  

 return esc_url_raw( $url ); 

}

//判断是否存在该函数，以便兼容老版本 

if ( function_exists( 'get_custom_header' ) ) { 

//get_custom_header()->width 调用带向 width 属性 

$header_image_width = get_custom_header()->width; 

//get_custom_header()->height 调用带向 height 属性 

$header_image_height = get_custom_header()->height; 

} else {//兼容老版本的代码 

$header_image_width = HEADER_IMAGE_WIDTH; 

$header_image_height = HEADER_IMAGE_HEIGHT; 

}

//打开主题自定义顶部支持 

add_theme_support( 'custom-header' ); 

  

$headarg = array(//将设置打包成数组 

 'default-image'   => '', 

 'random-default'   => false, 

 'width'     => 0, 

 'height'     => 0, 

 'flex-height'    => false, 

 'flex-width'     => false, 

 'default-text-color'   => '', 

 'header-text'    => true, 

 'uploads'    => true, 

 'wp-head-callback'  => '', 

 'admin-head-callback'  => '', 

 'admin-preview-callback' => '', 

); 

//将数组中的设置添加到自定义顶部上 

add_theme_support( 'custom-header', $headarg );

//打开主题自定义顶部支持 

add_theme_support( 'custom-header' ); 

  

$headarg = array(//将设置打包成数组 

 'default-image'   => '', 

 'random-default'   => false, 

 'width'     => 0, 

 'height'     => 0, 

 'flex-height'    => false, 

 'flex-width'     => false, 

 'default-text-color'   => '', 

 'header-text'    => true, 

 'uploads'    => true, 

 'wp-head-callback'  => '', 

 'admin-head-callback'  => '', 

 'admin-preview-callback' => '', 

); 

//将数组中的设置添加到自定义顶部上 

add_theme_support( 'custom-header', $headarg );

$args = array( 

 'flex-width'  => true,//自适应高度 

 'width'   => 980, 

 'flex-width'  => true,//自适应宽度 

 'height'  => 200, 

 'default-image' => get_template_directory_uri() . '/images/header.jpg', 

); 

add_theme_support( 'custom-header', $args );

<img  

  src="<?php header_image(); ?>"  

  height="<?php echo get_custom_header()->height; ?>"  

  width="<?php echo get_custom_header()->width; ?>"  

  alt=""  

/>