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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 |
|---|---|
| 1137 | /** |
| 1138 | * Filters the HTML output of the li element in the post custom fields list. |
| 1139 | * |
| 1140 | * @since 2.2.0 |
| 1141 | * |
| 1142 | * @param string $html The HTML output for the li element. |
| 1143 | * @param string $key Meta key. |
| 1144 | * @param string $value Meta value. |
| 1145 | */ |
| 1146 | $li_html .= apply_filters( 'the_meta_key', $html, $key, $value ); |
| 1147 | } |
| 1148 | |
| 1149 | if ( $li_html ) { |
| 1150 | echo "<ul class='post-meta'>\n{$li_html}</ul>\n"; |
| 1151 | } |
| 1152 | } |
| 1153 | } |
| 1154 | |
| 1155 | // |