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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 |
|---|---|
| 5134 | * Filters a fragment from the pattern passed to wp_sprintf(). |
| 5135 | * |
| 5136 | * If the fragment is unchanged, then sprintf() will be run on the fragment. |
| 5137 | * |
| 5138 | * @since 2.5.0 |
| 5139 | * |
| 5140 | * @param string $fragment A fragment from the pattern. |
| 5141 | * @param string $arg The argument. |
| 5142 | */ |
| 5143 | $_fragment = apply_filters( 'wp_sprintf', $fragment, $arg ); |
| 5144 | if ( $_fragment != $fragment ) { |
| 5145 | $fragment = $_fragment; |
| 5146 | } else { |
| 5147 | $fragment = sprintf( $fragment, (string) $arg ); |
| 5148 | } |
| 5149 | } |
| 5150 | |
| 5151 | // Append to result and move to next fragment. |
| 5152 | $result .= $fragment; |