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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 |
|---|---|
| 4839 | do_action( 'deprecated_function_run', $function, $replacement, $version ); |
| 4840 | |
| 4841 | /** |
| 4842 | * Filters whether to trigger an error for deprecated functions. |
| 4843 | * |
| 4844 | * @since 2.5.0 |
| 4845 | * |
| 4846 | * @param bool $trigger Whether to trigger the error for deprecated functions. Default true. |
| 4847 | */ |
| 4848 | if ( WP_DEBUG && apply_filters( 'deprecated_function_trigger_error', true ) ) { |
| 4849 | if ( function_exists( '__' ) ) { |
| 4850 | if ( $replacement ) { |
| 4851 | trigger_error( |
| 4852 | sprintf( |
| 4853 | /* translators: 1: PHP function name, 2: Version number, 3: Alternative function name. */ |
| 4854 | __( '%1$s is <strong>deprecated</strong> since version %2$s! Use %3$s instead.' ), |
| 4855 | $function, |
| 4856 | $version, |
| 4857 | $replacement |