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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 |
|---|---|
| 4543 | /** |
| 4544 | * Fires when a deprecated function is called. |
| 4545 | * |
| 4546 | * @since 2.5.0 |
| 4547 | * |
| 4548 | * @param string $function The function that was called. |
| 4549 | * @param string $replacement The function that should have been called. |
| 4550 | * @param string $version The version of WordPress that deprecated the function. |
| 4551 | */ |
| 4552 | do_action( 'deprecated_function_run', $function, $replacement, $version ); |
| 4553 | |
| 4554 | /** |
| 4555 | * Filters whether to trigger an error for deprecated functions. |
| 4556 | * |
| 4557 | * @since 2.5.0 |
| 4558 | * |
| 4559 | * @param bool $trigger Whether to trigger the error for deprecated functions. Default true. |
| 4560 | */ |
| 4561 | if ( WP_DEBUG && apply_filters( 'deprecated_function_trigger_error', true ) ) { |