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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 |
|---|---|
| 122 | * |
| 123 | * Could be used in the future to attach information such as |
| 124 | * IP address or user agent to a session. |
| 125 | * |
| 126 | * @since 4.0.0 |
| 127 | * |
| 128 | * @param array $session Array of extra data. |
| 129 | * @param int $user_id User ID. |
| 130 | */ |
| 131 | $session = apply_filters( 'attach_session_information', array(), $this->user_id ); |
| 132 | $session['expiration'] = $expiration; |
| 133 | |
| 134 | // IP address. |
| 135 | if ( !empty( $_SERVER['REMOTE_ADDR'] ) ) { |
| 136 | $session['ip'] = $_SERVER['REMOTE_ADDR']; |
| 137 | } |
| 138 | |
| 139 | // User-agent. |
| 140 | if ( ! empty( $_SERVER['HTTP_USER_AGENT'] ) ) { |