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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 |
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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 |
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