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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 |
|---|---|
| 3992 | * This string is substituted for the \s sequence as needed in regular |
| 3993 | * expressions. For websites not written in English, different characters |
| 3994 | * may represent whitespace. For websites not encoded in UTF-8, the 0xC2 0xA0 |
| 3995 | * sequence may not be in use. |
| 3996 | * |
| 3997 | * @since 4.0.0 |
| 3998 | * |
| 3999 | * @param string $spaces Regexp pattern for matching common whitespace characters. |
| 4000 | */ |
| 4001 | $spaces = apply_filters( 'wp_spaces_regexp', '[\r\n\t ]|\xC2\xA0| ' ); |
| 4002 | } |
| 4003 | |
| 4004 | return $spaces; |
| 4005 | } |
| 4006 | |