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Hooks in WordPress essentially allow you to manipulate code without editing core files

There are two types of hook: actions and filters.

Using action hooks

Unlike style.css, the functions.php of a child theme does not override its counterpart from the parent. Instead, it is loaded in addition to the parent’s functions.php. (Specifically, it is loaded right before the parent’s file.)

How to Password Protect the wp-login.php File

You have to choose a unique name for that global variable

Custom global variables

all variables that you refer to more than once, you should fetch them in one place

Cross-site request forgery (CSRF) vulnerability in the Shareaholic SexyBookmarks plugin 6.1.4.0 for WordPress

WordPress before 3.5.2 allows remote attackers to read arbitrary files