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HomeBackend DevelopmentPHP TutorialWordPress主题制作中自定义头部的相关PHP函数解析_PHP

header_image()
header_image() 函数是 WordPress 自定顶部图像的标准接口函数,该函数可以自动判断后台设置,并返回字符串形式的用户自定义顶部图像地址。本文主要涉及该函数的详解及使用。

【Display header image path.】 即,显示顶部图像地址。
使用

代码如下:


函数声明源代码

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 );
}

get_custom_header 自定义顶部
get_custom_header 函数是 WordPress 3.4 送给我们的新礼物,该函数的出现是为了更好的集成和封装顶部的使用,本文主要对 get_custom_header 这个函数进行详解、以及如何在 WordPress 3.4 版本的主题中集成顶部功能。

请注意,根据本文折腾你的主题时,请确保你的 WordPress 已经升级到 3.4版本。

get_custom_header 意义详解
自定义顶部目前大部分主题主要用到的还只是两个功能 1.自定义顶部图像 2.自定义顶部样式
具体的效果你可以看一下 默认主题 twenty eleven ,或者我的另一个博客 悠悠我心
本函数是 WP 3.4 版本后才出现的一个内置函数,主要用于将用户设置的顶部的各项参数以对象(object)的形式返回。
单单说这么句屁话,也许你还不明白,想要明白的话,请往下看。
请注意本函数与get_header()有着本质的区别。

函数使用实例
下面的例子来自于 默认主题 twenty eleven 中 header.php 文件
PHP 代码:

//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;
}

综合使用详解
以下主要援引官方文档解释 自定义顶部

//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 );

自定义顶部图像

//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 );

自适应顶部图像设置

$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 );

自定义顶部图像的调用

<img 
  src="<&#63;php header_image(); &#63;>" 
  height="<&#63;php echo get_custom_header()->height; &#63;>" 
  width="<&#63;php echo get_custom_header()->width; &#63;>" 
  alt="" 
/>

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