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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 |
|---|---|
| 1661 | * @param string $function The function that was called |
| 1662 | * @param string $version The version of WordPress that depreceated the function |
| 1663 | * @param string $replacement Optional. The function that should have been called |
| 1664 | */ |
| 1665 | function _deprecated_function($function, $version, $replacement=null) { |
| 1666 | |
| 1667 | do_action('deprecated_function_run', $function, $replacement); |
| 1668 | |
| 1669 | // Allow plugin to filter the output error trigger |
| 1670 | if( defined('WP_DEBUG') && ( true === WP_DEBUG ) && apply_filters( 'deprecated_function_trigger_error', true )) { |
| 1671 | if( !is_null($replacement) ) |
| 1672 | trigger_error( printf( __("%1$s is <strong>deprecated</strong> since version %2$s! Use %3$s instead."), $function, $version, $replacement ) ); |
| 1673 | else |
| 1674 | trigger_error( printf( __("%1$s is <strong>deprecated</strong> since version %2$s with no alternative available."), $function, $version ) ); |
| 1675 | } |
| 1676 | } |
| 1677 | |
| 1678 | /** |
| 1679 | * _deprecated_file() - Marks a file as deprecated and informs when it has been used. |