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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )
apply_filters( "hook_name", "what_to_filter" )
.Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
Line | Code |
---|---|
120 | ); |
121 | /** |
122 | * Filter the columns displayed in the Network Admin Users list table. |
123 | * |
124 | * @since MU |
125 | * |
126 | * @param array $users_columns An array of user columns. Default 'cb', 'username', |
127 | * 'name', 'email', 'registered', 'blogs'. |
128 | */ |
129 | $users_columns = apply_filters( 'wpmu_users_columns', $users_columns ); |
130 |
|
131 | return $users_columns; |
132 | } |
133 |
|
134 | function get_sortable_columns() { |
135 | return array( |
136 | 'username' => 'login', |
137 | 'name' => 'name', |
138 | 'email' => 'email', |