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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 |
|---|---|
| 5535 | do_action( 'deprecated_function_run', $function_name, $replacement, $version ); |
| 5536 | |
| 5537 | /** |
| 5538 | * Filters whether to trigger an error for deprecated functions. |
| 5539 | * |
| 5540 | * @since 2.5.0 |
| 5541 | * |
| 5542 | * @param bool $trigger Whether to trigger the error for deprecated functions. Default true. |
| 5543 | */ |
| 5544 | if ( WP_DEBUG && apply_filters( 'deprecated_function_trigger_error', true ) ) { |
| 5545 | if ( function_exists( '__' ) ) { |
| 5546 | if ( $replacement ) { |
| 5547 | $message = sprintf( |
| 5548 | /* translators: 1: PHP function name, 2: Version number, 3: Alternative function name. */ |
| 5549 | __( 'Function %1$s is <strong>deprecated</strong> since version %2$s! Use %3$s instead.' ), |
| 5550 | $function_name, |
| 5551 | $version, |
| 5552 | $replacement |
| 5553 | ); |