In Sierra version 10.12 of macOS , the option to allow to open apps downloaded from anywhere is disabled. It is even not visible in the System Preferences.
In order to activate it you have to do it over the Terminal. Read Disable Gatekeeper in macOS Sierra
Since WordPress 3.8 nice menu icons on dashboard appear beside different settings menu e.g. Posts, Pages, Media, Appearance etc. These icons do not use images but are build with CSS. If you are a WordPress plugin or theme developer, you can use these icons to have a nice icon for your product’s dashboard menu.
Admin menu items icons can only be added with register_post_type() and add_menu_page(). Both have an option to set an icon.
Read Add Dashicons to your WordPress Plugin Admin Menu Icon
Sometime you want to pass a large dataset into a mysql table using PHP.
Assembling one INSERT statement with multiple rows is much faster in MySQL than one INSERT statement per row. This sounds like you might be running into string-handling problems in PHP, if fact it is an algorithm problem. Basically, when working with large strings, you want to minimize unnecessary copying. In order to insert hundreds of rows at once, the fastest and most memory efficient way to build a large string is to take advantage of the implode() function and array assignment. Read Insert multiple rows via a PHP array into MYSQL
Technologies such as CSS3 media queries are becoming increasingly important and all new websites should use them. The main reason is that visitors have certain expectations when viewing your site on everything from a desktop to a laptop to a netbook to a tablet to a handheld. They expect your site to maintain a high level of user experience satisfaction no matter how or where they see your site. This article shows some techniques for using CSS3 media queries. Read An Introduction to CSS3 Media Queries
Sometimes you find yourself needing to access hidden files on your Mac, like an .htaccess file from your server, a .bash_profile, a .svn directory. On a Mac anything preceded with a ‘.’ is invisible by default. InvisibliX is a free application that will toggle hidden files to become visible. Read Quick way on how to show hidden files in OSX
