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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 |
|---|---|
| 3410 | * Filter a fragment from the pattern passed to wp_sprintf(). |
| 3411 | * |
| 3412 | * If the fragment is unchanged, then sprintf() will be run on the fragment. |
| 3413 | * |
| 3414 | * @since 2.5.0 |
| 3415 | * |
| 3416 | * @param string $fragment A fragment from the pattern. |
| 3417 | * @param string $arg The argument. |
| 3418 | */ |
| 3419 | $_fragment = apply_filters( 'wp_sprintf', $fragment, $arg ); |
| 3420 | if ( $_fragment != $fragment ) |
| 3421 | $fragment = $_fragment; |
| 3422 | else |
| 3423 | $fragment = sprintf($fragment, strval($arg) ); |
| 3424 | } |
| 3425 | |
| 3426 | // Append to result and move to next fragment |
| 3427 | $result .= $fragment; |
| 3428 | $start = $end; |