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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 |
---|---|
125 | * |
126 | * Could be used in the future to attach information such as |
127 | * IP address or user agent to a session. |
128 | * |
129 | * @since 4.0.0 |
130 | * |
131 | * @param array $session Array of extra data. |
132 | * @param int $user_id User ID. |
133 | */ |
134 | $session = apply_filters( 'attach_session_information', array(), $this->user_id ); |
135 | $session['expiration'] = $expiration; |
136 |
|
137 | // IP address. |
138 | if ( !empty( $_SERVER['REMOTE_ADDR'] ) ) { |
139 | $session['ip'] = $_SERVER['REMOTE_ADDR']; |
140 | } |
141 |
|
142 | // User-agent. |
143 | if ( ! empty( $_SERVER['HTTP_USER_AGENT'] ) ) { |