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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 |
|---|---|
| 62 | foreach ( (array) $blogs as $details ) { |
| 63 | switch_to_blog( $details['blog_id'] ); |
| 64 | $siteurl = site_url(); |
| 65 | $upgrade_url = admin_url( 'upgrade.php?step=upgrade_db' ); |
| 66 | restore_current_blog(); |
| 67 | echo "<li>$siteurl</li>"; |
| 68 | $response = wp_remote_get( $upgrade_url, array( 'timeout' => 120, 'httpversion' => '1.1' ) ); |
| 69 | if ( is_wp_error( $response ) ) |
| 70 | wp_die( sprintf( __( 'Warning! Problem updating %1$s. Your server may not be able to connect to sites running on it. Error message: <em>%2$s</em>' ), $siteurl, $response->get_error_message() ) ); |
| 71 | do_action( 'after_mu_upgrade', $response ); |
| 72 | do_action( 'wpmu_upgrade_site', $details[ 'blog_id' ] ); |
| 73 | } |
| 74 | echo "</ul>"; |
| 75 | ?><p><?php _e( 'If your browser doesn’t start loading the next page automatically, click this link:' ); ?> <a class="button" href="upgrade.php?action=upgrade&n=<?php echo ($n + 5) ?>"><?php _e("Next Sites"); ?></a></p> |
| 76 | <script type='text/javascript'> |
| 77 | <!-- |
| 78 | function nextpage() { |
| 79 | location.href = "upgrade.php?action=upgrade&n=<?php echo ($n + 5) ?>"; |
| 80 | } |