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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 |
|---|---|
| 2621 | if ( preg_match('/^%(\d+)\$/', $fragment, $matches) ) { |
| 2622 | $arg = isset($args[$matches[1]]) ? $args[$matches[1]] : ''; |
| 2623 | $fragment = str_replace("%{$matches[1]}$", '%', $fragment); |
| 2624 | } else { |
| 2625 | ++$arg_index; |
| 2626 | $arg = isset($args[$arg_index]) ? $args[$arg_index] : ''; |
| 2627 | } |
| 2628 | |
| 2629 | // Apply filters OR sprintf |
| 2630 | $_fragment = apply_filters( 'wp_sprintf', $fragment, $arg ); |
| 2631 | if ( $_fragment != $fragment ) |
| 2632 | $fragment = $_fragment; |
| 2633 | else |
| 2634 | $fragment = sprintf($fragment, strval($arg) ); |
| 2635 | } |
| 2636 | |
| 2637 | // Append to result and move to next fragment |
| 2638 | $result .= $fragment; |
| 2639 | $start = $end; |