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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 |
|---|---|
| 4041 | $new = implode("\n", $pung); |
| 4042 | |
| 4043 | /** |
| 4044 | * Filter the new ping URL to add for the given post. |
| 4045 | * |
| 4046 | * @since 2.0.0 |
| 4047 | * |
| 4048 | * @param string $new New ping URL to add. |
| 4049 | */ |
| 4050 | $new = apply_filters( 'add_ping', $new ); |
| 4051 | |
| 4052 | // expected_slashed ($new). |
| 4053 | $new = wp_unslash($new); |
| 4054 | return $wpdb->update( $wpdb->posts, array( 'pinged' => $new ), array( 'ID' => $post_id ) ); |
| 4055 | } |
| 4056 | |
| 4057 | /** |
| 4058 | * Retrieve enclosures already enclosed for a post. |
| 4059 | * |