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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 |
---|---|
4289 | * This string is substituted for the \s sequence as needed in regular |
4290 | * expressions. For websites not written in English, different characters |
4291 | * may represent whitespace. For websites not encoded in UTF-8, the 0xC2 0xA0 |
4292 | * sequence may not be in use. |
4293 | * |
4294 | * @since 4.0.0 |
4295 | * |
4296 | * @param string $spaces Regexp pattern for matching common whitespace characters. |
4297 | */ |
4298 | $spaces = apply_filters( 'wp_spaces_regexp', '[\r\n\t ]|\xC2\xA0| ' ); |
4299 | } |
4300 |
|
4301 | return $spaces; |
4302 | } |
4303 |
|
4304 | /** |
4305 | * Print the important emoji-related styles. |
4306 | * |
4307 | * @since 4.2.0 |