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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 |
|---|---|
| 1186 | } |
| 1187 | |
| 1188 | /** |
| 1189 | * Filters the header image URL. |
| 1190 | * |
| 1191 | * @since 6.1.0 |
| 1192 | * |
| 1193 | * @param string $url Header image URL. |
| 1194 | */ |
| 1195 | $url = apply_filters( 'get_header_image', $url ); |
| 1196 | |
| 1197 | if ( ! is_string( $url ) ) { |
| 1198 | return false; |
| 1199 | } |
| 1200 | |
| 1201 | $url = trim( $url ); |
| 1202 | return sanitize_url( set_url_scheme( $url ) ); |
| 1203 | } |
| 1204 | |