WordPress issues

权限重置
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# Change permissions for WordPress Folders 755:
find /your_wordpress_folder/ -type d -exec chmod 755 {} \;
# Change permissions for WordPress Files 644:
find /your_wordpress_folder/ -type f -exec chmod 644 {} \;
# Change permissions for wp-config.php
chmod 600 wp-config.php
# set the ownership
chown -R nginx:nginx /your_wordpress_folder/
systemctl restart nginx
systemctl restart php-fpm
setenforce 0
# all done
setenforce 1

文章顶部图片规格
1200×300 72dpi 平滑：8 像素应用画布边界的效果

Shortcodes

// Display the total number of published posts using the shortcode 69
function customprefix_total_number_published_posts($atts) {
    return wp_count_posts('post')->publish;
}
add_shortcode('published-posts-count', 'customprefix_total_number_published_posts');

Configure PHP

Open /etc/php.ini file

vim /etc/php.ini

Add the following contents to the file.

file_uploads = On
allow_url_fopen = On
; Maximum execution time of each script, in seconds
max_execution_time = 300
; Maximum amount of memory a script may consume (128MB)
memory_limit = 256M
; Maximum allowed size for uploaded files.
upload_max_filesize = 64M
; Maximum size of POST data that PHP will accept.
post_max_size = 64M
; How many GET/POST/COOKIE input variables may be accepted
max_input_vars = 15000
date.timezone = Asia/Shanghai

Open /etc/nginx/nginx.conf

Add the following contents to the file.

# set client body size to 64M #
# 在WP后台更新主题时，提示：<!-- a padding to disable MSIE and Chrome friendly error page -->
# 这是因为上传文件的大小超出了 Nginx 允许的最大值，在 http{} 段中增大nginx上传文件大小限制
# 这个大小client_max_body_size要和php.ini中的post_max_size和upload_max_filesize最大值一致或者稍大，这样就不会因为提交数据大小不一致出现的错误。
client_max_body_size 64M;

Configure Database For WordPress

Step 1: Login to the database using the password you set for root.

mysql -u root -p

Step 2: Create a database named “wordpress-db”

CREATE DATABASE wordpress-db;

Step 3: Create a new databases user named “wordpress-admin” and set a custom password. This user will be used in the WordPress configuration.

CREATE USER 'wordpress-admin'@'localhost' IDENTIFIED BY 'your_password_here';

Step 4: Grant all privileged on wordpress-db for wordpress-admin user. Replace the password you set for wordpress-admin.

GRANT ALL ON wordpress-db.* TO 'wordpress-admin'@'localhost' IDENTIFIED BY 'your-password-here' WITH GRANT OPTION;

GRANT ALL PRIVILEGES ON database_name.* TO 'username'@'localhost';

Step 5: Flush all privileges and exit the db shell.

FLUSH PRIVILEGES;
\q

Or Change Password

SET PASSWORD FOR 'tom'@'localhost' = PASSWORD('abedefg123');

Configure WordPress

Open wp-config.php file And add the following contents to the file.

/** Sets up 'direct' method for wordpress, auto update without ftp */
define( 'FS_METHOD', 'direct');
/** Unblock WP's memory limit and change php.ini's memory_limit field to the same memory size */
define('WP_MEMORY_LIMIT', '256M');

Change the ownership of the wordpress folder to nginx

chown -R nginx:nginx /usr/share/nginx/html/wordpress/

Symptoms

phpMyAdmin – Error

Error during session start; please check your PHP and/or webserver log file and configure your PHP installation properly. Also ensure that cookies are enabled in your browser.

session_start(): open(SESSION_FILE, O_RDWR) failed: Permission denied (13)

session_start(): Failed to read session data: files (path: /var/lib/php/session)

Cause

The permissions for PHP session directory are incorrect or directory does not exist.

Resolution

1.on RHEL and CentOS systems, if session.save_path is not set, session files will be saved in /var/lib/php/session.

2.Connect to the server via SSH and make sure the directory exists and have proper permissions (1733). If path is /var/lib/php/session:

# stat /var/lib/php/session | grep Access
Access: (1733/drwx-wx-wt) Uid: ( 0/ root) Gid: ( 0/ root)

If directory does not exists create it and set valid permissions:

mkdir -p /var/lib/php/session && chmod 1733 /var/lib/php/session

If directory exists but permissions are different, set the correct ones:

chmod 1733 /var/lib/php/session

Note: If the issue persists, disable SELinux:

setenforce 0

https://guide.the7.io/user-guide/the7-dashboard/icon-manager/

icon: https://icomoon.io

配置 nginx

在WP后台更新主题或安装插件时，提示：

<!-- a padding to disable MSIE and Chrome friendly error page -->

或提示：

413 Request Entity Too Large errors

或者在安装插件时，提示：

Update Failed: <!DOCTYPE html> Error body { width: 35em; margin: 0 auto; font-family: Tahoma, Verdana, Arial, sans-serif; }

这都是因为上传文件的大小超出了 nginx 允许的最大值，在 http{} 字段中增大 nginx 上传文件大小限制，这个 client_max_body_size 值的大小要和 php.ini 中的 post_max_size 和 upload_max_filesize 最大值一致或者稍大，这样就不会因为提交数据大小不一致出现的错误。在 /etc/nginx/nginx.conf 的 http 字段追加如下参数解决如上问题：

http {
    ...
    client_max_body_size 64m;
    ...
}

在查看 nginx 的状态：systemctl status nginx，提示：

nginx: [warn] conflicting server name "www.example.com" on 0.0.0.0:443, ignored
nginx: [warn] conflicting server name "www.example.com" on 0.0.0.0:80, ignored

那是因为在 /etc/nginx/conf.d 的网站配置中，有一个以上的网站指向了同一个目录，保留一个，移走、删除或找到指向路径的网站指向其它路径即可。

删除WordPress中的注销确认
将如下代码追加到主题中Functions.php文件

/**
 * Bypass logout confirmation on nonce verification failure
 */
function logout_without_confirmation($action, $result){
    if(!$result && ($action == 'log-out')){ 
        wp_safe_redirect(getLogoutUrl()); 
        exit(); 
    }
}
add_action( 'check_admin_referer', 'logout_without_confirmation', 1, 2);

禁止图片被自动裁剪
1、后台->设置->媒体（媒体设置）：取消勾选：总是裁剪缩略图到这个尺寸（一般情况下，缩略图应保持原始比例），然后，将所有尺寸宽高全部设为0；
2、在WordPress后台设置中打开隐藏的设置连接 http://你的域名/wp-admin/options.php，搜索 medium_large_size_w，并设置 0，保存。
functions.php code

// https://gist.github.com/czenzel/0f5888cbbfa4a857e56361dd3bc19b39
// https://www.mediumtalk.net/fix-featured-image-auto-cropping-wordpress/
add_action( 'init', 'czc_disable_extra_image_sizes' );
add_filter( 'image_resize_dimensions', 'czc_disable_crop', 10, 6 );

function czc_disable_crop( $enable, $orig_w, $orig_h, $dest_w, $dest_h, $crop )
{
    //Instantly disable this filter after the first run
    //remove_filter( current_filter(), __FUNCTION__ );
    //return image_resize_dimensions( $orig_w, $orig_h, $dest_w, $dest_h, false );
    return false;
}
//echo '<pre>';
//print_r(get_intermediate_image_sizes());
//echo '<pre>';
function czc_disable_extra_image_sizes() {

    foreach ( get_intermediate_image_sizes() as $size ) {
        remove_image_size( $size );
    }
}

更改JPEG图片的压缩质量
科普一下：JPEG 在这里所指的是一种压缩方式，用这种压缩格式的文件一般称之为JPEG；此类文件的一般扩展名有：jpeg、jfif、jpg 或 jpe。默认情况下，WordPress会对上传的图片进行压缩，以获得更好的用户体验。默认的压缩质量为 90%，是为优化图片在手机端的加载速度，但也因此造成上传的图片都被压缩、视觉效果变模糊。WordPress提供了 jpeg_quality 钩子，以便让用户可以自定义参数。我们就是借助这个钩子来实现修改图片压缩质量。具体的方法就是将下面的代码添加到当前主题的 functions.php 文件，更改 return 的返回值，例如：希望上传的图片不被压缩，改为 100 即可：

/**
 * 自定义JPEG图片压缩质量
 * https://www.wpdaxue.com/wp_image_editor-jpeg_quality.html
 */
function wpdx_custom_jpeg_quality() {
    //根据实际需求，修改下面的数字即可
    return 90;
}
add_filter( 'jpeg_quality', 'wpdx_custom_jpeg_quality');

Replace URLs to HTTPS
适用于域名变化而做全局URL更改

/* WordPress Address (URL) AND Site Address (URL) replace */
UPDATE wp_options SET option_value = replace(option_value, 'http://example.com', 'https://example.com') WHERE option_name = 'home' OR option_name = 'siteurl';
/* Menu structure url replace */
UPDATE wp_postmeta SET meta_value = replace(meta_value, 'http://example.com', 'https://example.com') WHERE `meta_key` = '_menu_item_url';

MySQL UPDATE COMMAND

UPDATE table_name SET field1 = new-value1, field2 = new-value2 [WHERE Clause]

Created： 2020-10-10 11:05:43 1964

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