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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 |
|---|---|
| 58 | |
| 59 | /** |
| 60 | * Fires before each tab on the Install Plugins screen is loaded. |
| 61 | * |
| 62 | * The dynamic portion of the action hook, `$tab`, allows for targeting |
| 63 | * individual tabs, for instance 'install_plugins_pre_plugin-information'. |
| 64 | * |
| 65 | * @since 2.7.0 |
| 66 | */ |
| 67 | do_action( "install_plugins_pre_{$tab}" ); |
| 68 | |
| 69 | /* |
| 70 | * Call the pre upload action on every non-upload plugin install screen |
| 71 | * because the form is always displayed on these screens. |
| 72 | */ |
| 73 | if ( 'upload' !== $tab ) { |
| 74 | /** This action is documented in wp-admin/plugin-install.php */ |
| 75 | do_action( 'install_plugins_pre_upload' ); |
| 76 | } |