在wordpress中,很多主题都提供了很多小工具,其中很有用的一个小工具就是文本小工具。
下面说一下具体如何让文本小工具运行php代码来实现面包屑导航。
1.首先在主题下的function.php中要先添加面包屑导航函数
//添加面包屑导航function iaccepted_breadcrumbs() { $delimiter = '»'; $name = 'Home'; //text for the 'Home' link $currentBefore = '<span>'; $currentAfter = '</span>'; if ( !is_home() && !is_front_page() || is_paged() ) { echo '<div id="crumbs">'; global $post; $home = get_bloginfo('url'); echo '<a href="' . $home . '"><font color=red>' . $name . '</font></a> ' . $delimiter . ' '; if ( is_category() ) { global $wp_query; $cat_obj = $wp_query->get_queried_object(); $thisCat = $cat_obj->term_id; $thisCat = get_category($thisCat); $parentCat = get_category($thisCat->parent); if ($thisCat->parent != 0) echo(get_category_parents($parentCat, TRUE, ' ' . $delimiter . ' ')); echo $currentBefore; single_cat_title(); echo $currentAfter; } elseif ( is_day() ) { echo '<a href="' . get_year_link(get_the_time('Y')) . '">' . get_the_time('Y') . '</a> ' . $delimiter . ' '; echo '<a href="' . get_month_link(get_the_time('Y'),get_the_time('m')) . '">' . get_the_time('F') . '</a> ' . $delimiter . ' '; echo $currentBefore . get_the_time('d') . $currentAfter; } elseif ( is_month() ) { echo '<a href="' . get_year_link(get_the_time('Y')) . '">' . get_the_time('Y') . '</a> ' . $delimiter . ' '; echo $currentBefore . get_the_time('F') . $currentAfter; } elseif ( is_year() ) { echo $currentBefore . get_the_time('Y') . $currentAfter; } elseif ( is_single() ) { $cat = get_the_category(); $cat = $cat[0]; echo get_category_parents($cat, TRUE, ' ' . $delimiter . ' '); echo $currentBefore; the_title(); echo $currentAfter; } elseif ( is_page() && !$post->post_parent ) { echo $currentBefore; the_title(); echo $currentAfter; } elseif ( is_page() && $post->post_parent ) { $parent_id = $post->post_parent; $breadcrumbs = array(); while ($parent_id) { $page = get_page($parent_id); $breadcrumbs[] = '<a href="' . get_permalink($page->ID) . '">' . get_the_title($page->ID) . '</a>'; $parent_id = $page->post_parent; } $breadcrumbs = array_reverse($breadcrumbs); foreach ($breadcrumbs as $crumb) echo $crumb . ' ' . $delimiter . ' '; echo $currentBefore; the_title(); echo $currentAfter; } elseif ( is_search() ) { echo $currentBefore . get_search_query() . $currentAfter; } elseif ( is_tag() ) { echo $currentBefore; single_tag_title(); echo $currentAfter; } elseif ( is_author() ) { global $author; $userdata = get_userdata($author); echo $currentBefore .' ' . $userdata->display_name . $currentAfter; } elseif ( is_404() ) { echo $currentBefore . 'Error 404' . $currentAfter; } if ( get_query_var('paged') ) { if ( is_category() || is_day() || is_month() || is_year() || is_search() || is_tag() || is_author() ) echo ' ('; echo __('Page') . ' ' . get_query_var('paged'); if ( is_category() || is_day() || is_month() || is_year() || is_search() || is_tag() || is_author() ) echo ')'; } echo '</div>'; }}
2要让小工具能够运行php代码必须要现在主题下的functions.php中加入如下代码
//让小工具中可以嵌入php代码function php_text($text){ if (strpos($text, '<'.'?')!==false) { ob_start(); eval('?'.'>'.$text); $text = ob_get_contents(); ob_end_clean(); } return $text;}add_filter('widget_text', 'php_text', 90);
这个样就能保证文本小工具中可以嵌入php代码并能正常执行。
3.选择要加入导航的位置,放置一个文本小工具,然后标题不需要填,内容填写如下:
您现在的位置:<?php if (functions_exists('iaccepted_breadcrumbs')) iaccepted_breadcrumbs(); ?>
这样就完成了在文本小工具中运行php代码实现面包屑导航,具体效果可以看本文章上方的导航。

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.

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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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