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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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34 | do_action( 'add_meta_boxes', 'link', $link ); |
35 |
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36 | /** |
37 | * Fires when link-specific meta boxes are added. |
38 | * |
39 | * @since 3.0.0 |
40 | * |
41 | * @param object $link Link object. |
42 | */ |
43 | do_action( 'add_meta_boxes_link', $link ); |
44 |
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45 | /** This action is documented in wp-admin/edit-form-advanced.php */ |
46 | do_action( 'do_meta_boxes', 'link', 'normal', $link ); |
47 | /** This action is documented in wp-admin/edit-form-advanced.php */ |
48 | do_action( 'do_meta_boxes', 'link', 'advanced', $link ); |
49 | /** This action is documented in wp-admin/edit-form-advanced.php */ |
50 | do_action( 'do_meta_boxes', 'link', 'side', $link ); |
51 |
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52 | add_screen_option('layout_columns', array('max' => 2, 'default' => 2) ); |