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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 |
|---|---|
| 4402 | * Filters a fragment from the pattern passed to wp_sprintf(). |
| 4403 | * |
| 4404 | * If the fragment is unchanged, then sprintf() will be run on the fragment. |
| 4405 | * |
| 4406 | * @since 2.5.0 |
| 4407 | * |
| 4408 | * @param string $fragment A fragment from the pattern. |
| 4409 | * @param string $arg The argument. |
| 4410 | */ |
| 4411 | $_fragment = apply_filters( 'wp_sprintf', $fragment, $arg ); |
| 4412 | if ( $_fragment != $fragment ) |
| 4413 | $fragment = $_fragment; |
| 4414 | else |
| 4415 | $fragment = sprintf($fragment, strval($arg) ); |
| 4416 | } |
| 4417 | |
| 4418 | // Append to result and move to next fragment |
| 4419 | $result .= $fragment; |
| 4420 | $start = $end; |