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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 |
|---|---|
| 179 | |
| 180 | /** |
| 181 | * Fires authenticated Ajax actions for logged-in users. |
| 182 | * |
| 183 | * The dynamic portion of the hook name, `$action`, refers |
| 184 | * to the name of the Ajax action callback being fired. |
| 185 | * |
| 186 | * @since 2.1.0 |
| 187 | */ |
| 188 | do_action( "wp_ajax_{$action}" ); |
| 189 | } else { |
| 190 | // If no action is registered, return a Bad Request response. |
| 191 | if ( ! has_action( "wp_ajax_nopriv_{$action}" ) ) { |
| 192 | wp_die( '0', 400 ); |
| 193 | } |
| 194 | |
| 195 | /** |
| 196 | * Fires non-authenticated Ajax actions for logged-out users. |
| 197 | * |