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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 |
|---|---|
| 131 | $login_header_url = apply_filters( 'login_headerurl', $login_header_url ); |
| 132 | |
| 133 | /** |
| 134 | * Filters the title attribute of the header logo above login form. |
| 135 | * |
| 136 | * @since 2.1.0 |
| 137 | * |
| 138 | * @param string $login_header_title Login header logo title attribute. |
| 139 | */ |
| 140 | $login_header_title = apply_filters( 'login_headertitle', $login_header_title ); |
| 141 | |
| 142 | /* |
| 143 | * To match the URL/title set above, Multisite sites have the blog name, |
| 144 | * while single sites get the header title. |
| 145 | */ |
| 146 | if ( is_multisite() ) { |
| 147 | $login_header_text = get_bloginfo( 'name', 'display' ); |
| 148 | } else { |
| 149 | $login_header_text = $login_header_title; |