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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 |
|---|---|
| 3059 | if ( preg_match('/^%(\d+)\$/', $fragment, $matches) ) { |
| 3060 | $arg = isset($args[$matches[1]]) ? $args[$matches[1]] : ''; |
| 3061 | $fragment = str_replace("%{$matches[1]}$", '%', $fragment); |
| 3062 | } else { |
| 3063 | ++$arg_index; |
| 3064 | $arg = isset($args[$arg_index]) ? $args[$arg_index] : ''; |
| 3065 | } |
| 3066 | |
| 3067 | // Apply filters OR sprintf |
| 3068 | $_fragment = apply_filters( 'wp_sprintf', $fragment, $arg ); |
| 3069 | if ( $_fragment != $fragment ) |
| 3070 | $fragment = $_fragment; |
| 3071 | else |
| 3072 | $fragment = sprintf($fragment, strval($arg) ); |
| 3073 | } |
| 3074 | |
| 3075 | // Append to result and move to next fragment |
| 3076 | $result .= $fragment; |
| 3077 | $start = $end; |