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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 |
|---|---|
| 5835 | * |
| 5836 | * @since 3.1.0 |
| 5837 | * @since 5.1.0 Added the $function_name, $message and $version parameters. |
| 5838 | * |
| 5839 | * @param bool $trigger Whether to trigger the error for _doing_it_wrong() calls. Default true. |
| 5840 | * @param string $function_name The function that was called. |
| 5841 | * @param string $message A message explaining what has been done incorrectly. |
| 5842 | * @param string $version The version of WordPress where the message was added. |
| 5843 | */ |
| 5844 | if ( WP_DEBUG && apply_filters( 'doing_it_wrong_trigger_error', true, $function_name, $message, $version ) ) { |
| 5845 | if ( function_exists( '__' ) ) { |
| 5846 | if ( $version ) { |
| 5847 | /* translators: %s: Version number. */ |
| 5848 | $version = sprintf( __( '(This message was added in version %s.)' ), $version ); |
| 5849 | } |
| 5850 | |
| 5851 | $message .= ' ' . sprintf( |
| 5852 | /* translators: %s: Documentation URL. */ |
| 5853 | __( 'Please see <a href="%s">Debugging in WordPress</a> for more information.' ), |