add_post_meta
add_post_meta 函数是 WordPress 中用来给文章或页面添加自定义字段值的一个函数,
其用法与在编写文章时在文章编写界面中利用自定义栏目面板为文章添加自定义字段值的效果是一样的。
add_post_meta函数描述
为文章添加自定义字段。
常见的使用有:文章浏览次数、喜欢按钮、seo插件等常用插件就是使用的自定义字段功能。
参数详解
add_post_meta($post_id, $meta_key, $meta_value,$unique);
$post_id
要添加自定义字段的文章或页面的ID值
$meta_key
自定义字段的键值(名字)
$meta_value
自定义字段的值
$unique
如果已经有相同名字的自定义字段,是否重复添加重名的自定义字段,true为不允许,false为允许
函数使用实例
//为ID为1的文章添加_postviews自定义字段,值为99 add_post_meta(1, "_postviews", "99"); var_dump(get_post_meta(1));echo"<br />"; //为ID为1的文章添加_postviews自定义字段,值为999,并允许重复自定义字段名称 add_post_meta(1, "_postviews", 999,false); var_dump(get_post_meta(1));echo"<br />";
演示效果:
array(1) { ["_postviews"]=> array(1) { [0]=> string(2) "99" } } array(1) { ["_postviews"]=> array(2) { [0]=> string(2) "99" [1]=> string(3) "999" } } //不允许重复自定义字段的代码 add_post_meta(1, "_postviews", "996",true); var_dump(get_post_meta(1));echo"<br />"; add_post_meta(1, "_postviews", "997",true); var_dump(get_post_meta(1));echo"<br />"; array(1) { ["_postviews"]=> array(1) { [0]=> string(3) "996" } } array(1) { ["_postviews"]=> array(1) { [0]=> string(3) "996" } }
add_meta_box
add_meta_box 是 WordPress 进阶使用的一个函数,能用到这个函数那说明你已经比一个普通的博主更了解这个世界瞩目的博客程序了,至少你在它身上已经花了不少功夫了。能用到它,说明你现在正在折腾一个你自己的主题、插件,甚至是在折腾 WordPress 后台了。
好像已经赘述的够多了,下面我们以一个进阶的角度去说明一下这个函数怎么用。
add_meta_box 函数说明
add_meta_box 函数是被用来在文章编辑等页面添加一个设置的区域的函数。
参数说明
<?php add_meta_box( $id, $title, $callback, $post_type, $context, $priority, $callback_args ); ?>
$id HTML 代码中设置区域中id属性的值
$title 区域中的标题名称
$callback 添加的设置区域的显示函数(回调函数)
$post_type 在 post 还是 page 的编辑页面中显示
$context 设置区域的显示位置,主编辑区、边栏、其他
$priority 设置区域显示的优先级
$callback_args 回调函数接受的附加参数
使用实例
function add_xz_box (){//添加设置区域的函数 add_meta_box('xz_box_1', 'add_meta_box 测试', 'xz_box_1','post','side','high',array('str1','str2')); }; //在'add_meta_boxes'挂载 add_xz_box 函数 add_action('add_meta_boxes','add_xz_box'); function xz_box_1($post,$boxargs){//显示设置区域的回调函数 echo"add_meta_box 测试"; };

What’s still popular is the ease of use, flexibility and a strong ecosystem. 1) Ease of use and simple syntax make it the first choice for beginners. 2) Closely integrated with web development, excellent interaction with HTTP requests and database. 3) The huge ecosystem provides a wealth of tools and libraries. 4) Active community and open source nature adapts them to new needs and technology trends.

PHP and Python are both high-level programming languages that are widely used in web development, data processing and automation tasks. 1.PHP is often used to build dynamic websites and content management systems, while Python is often used to build web frameworks and data science. 2.PHP uses echo to output content, Python uses print. 3. Both support object-oriented programming, but the syntax and keywords are different. 4. PHP supports weak type conversion, while Python is more stringent. 5. PHP performance optimization includes using OPcache and asynchronous programming, while Python uses cProfile and asynchronous programming.

PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.

PHP originated in 1994 and was developed by RasmusLerdorf. It was originally used to track website visitors and gradually evolved into a server-side scripting language and was widely used in web development. Python was developed by Guidovan Rossum in the late 1980s and was first released in 1991. It emphasizes code readability and simplicity, and is suitable for scientific computing, data analysis and other fields.

PHP is suitable for web development and rapid prototyping, and Python is suitable for data science and machine learning. 1.PHP is used for dynamic web development, with simple syntax and suitable for rapid development. 2. Python has concise syntax, is suitable for multiple fields, and has a strong library ecosystem.

PHP remains important in the modernization process because it supports a large number of websites and applications and adapts to development needs through frameworks. 1.PHP7 improves performance and introduces new features. 2. Modern frameworks such as Laravel, Symfony and CodeIgniter simplify development and improve code quality. 3. Performance optimization and best practices further improve application efficiency.

PHPhassignificantlyimpactedwebdevelopmentandextendsbeyondit.1)ItpowersmajorplatformslikeWordPressandexcelsindatabaseinteractions.2)PHP'sadaptabilityallowsittoscaleforlargeapplicationsusingframeworkslikeLaravel.3)Beyondweb,PHPisusedincommand-linescrip

PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.


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