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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 |
|---|---|
| 3556 | do_action( 'deprecated_function_run', $function, $replacement, $version ); |
| 3557 | |
| 3558 | /** |
| 3559 | * Filter whether to trigger an error for deprecated functions. |
| 3560 | * |
| 3561 | * @since 2.5.0 |
| 3562 | * |
| 3563 | * @param bool $trigger Whether to trigger the error for deprecated functions. Default true. |
| 3564 | */ |
| 3565 | if ( WP_DEBUG && apply_filters( 'deprecated_function_trigger_error', true ) ) { |
| 3566 | if ( function_exists( '__' ) ) { |
| 3567 | if ( ! is_null( $replacement ) ) |
| 3568 | trigger_error( sprintf( __('%1$s is <strong>deprecated</strong> since version %2$s! Use %3$s instead.'), $function, $version, $replacement ) ); |
| 3569 | else |
| 3570 | trigger_error( sprintf( __('%1$s is <strong>deprecated</strong> since version %2$s with no alternative available.'), $function, $version ) ); |
| 3571 | } else { |
| 3572 | if ( ! is_null( $replacement ) ) |
| 3573 | trigger_error( sprintf( '%1$s is <strong>deprecated</strong> since version %2$s! Use %3$s instead.', $function, $version, $replacement ) ); |
| 3574 | else |