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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 |
|---|---|
| 5057 | * Filters a fragment from the pattern passed to wp_sprintf(). |
| 5058 | * |
| 5059 | * If the fragment is unchanged, then sprintf() will be run on the fragment. |
| 5060 | * |
| 5061 | * @since 2.5.0 |
| 5062 | * |
| 5063 | * @param string $fragment A fragment from the pattern. |
| 5064 | * @param string $arg The argument. |
| 5065 | */ |
| 5066 | $_fragment = apply_filters( 'wp_sprintf', $fragment, $arg ); |
| 5067 | if ( $_fragment != $fragment ) { |
| 5068 | $fragment = $_fragment; |
| 5069 | } else { |
| 5070 | $fragment = sprintf( $fragment, strval( $arg ) ); |
| 5071 | } |
| 5072 | } |
| 5073 | |
| 5074 | // Append to result and move to next fragment. |
| 5075 | $result .= $fragment; |