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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 |
|---|---|
| 1010 | * Important: Because this filter is applied inside an output buffer callback (i.e. display handler), any |
| 1011 | * callbacks added to the filter must not attempt to start their own output buffers. Otherwise, PHP will raise a |
| 1012 | * fatal error: "Cannot use output buffering in output buffering display handlers." |
| 1013 | * |
| 1014 | * @since 6.9.0 |
| 1015 | * |
| 1016 | * @param string $filtered_output HTML template enhancement output buffer. |
| 1017 | * @param string $output Original HTML template output buffer. |
| 1018 | */ |
| 1019 | $filtered_output = (string) apply_filters( 'wp_template_enhancement_output_buffer', $filtered_output, $output ); |
| 1020 | } catch ( Throwable $throwable ) { |
| 1021 | // Emit to the error log as a warning not as an error to prevent halting execution. |
| 1022 | $did_just_catch = true; |
| 1023 | trigger_error( |
| 1024 | sprintf( |
| 1025 | /* translators: %s is the throwable class name */ |
| 1026 | __( 'Uncaught "%s" thrown:' ), |
| 1027 | get_class( $throwable ) |
| 1028 | ) . ' ' . $throwable->getMessage(), |