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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 |
|---|---|
| 1111 | /** |
| 1112 | * Filters the HTML output of the li element in the post custom fields list. |
| 1113 | * |
| 1114 | * @since 2.2.0 |
| 1115 | * |
| 1116 | * @param string $html The HTML output for the li element. |
| 1117 | * @param string $key Meta key. |
| 1118 | * @param string $value Meta value. |
| 1119 | */ |
| 1120 | $li_html .= apply_filters( 'the_meta_key', $html, $key, $value ); |
| 1121 | } |
| 1122 | |
| 1123 | if ( $li_html ) { |
| 1124 | echo "<ul class='post-meta'>\n{$li_html}</ul>\n"; |
| 1125 | } |
| 1126 | } |
| 1127 | } |
| 1128 | |
| 1129 | // |