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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 | 
|---|---|
| 1568 |  | 
| 1569 | $admin_body_class .= ' locale-' . sanitize_html_class( strtolower( str_replace( '_', '-', get_locale() ) ) ); | 
| 1570 |  | 
| 1571 | if ( is_rtl() ) | 
| 1572 |      $admin_body_class .= ' rtl'; | 
| 1573 |  | 
| 1574 | ?> | 
| 1575 | </head> | 
| 1576 | <?php /** This filter is documented in wp-admin/admin-header.php */ ?> | 
| 1577 | <body<?php if ( isset($GLOBALS['body_id']) ) echo ' id="' . $GLOBALS['body_id'] . '"'; ?> class="wp-admin wp-core-ui no-js iframe <?php echo apply_filters( 'admin_body_class', '' ) . ' ' . $admin_body_class; ?>"> | 
| 1578 | <script type="text/javascript"> | 
| 1579 | //<![CDATA[ | 
| 1580 | (function(){ | 
| 1581 | var c = document.body.className; | 
| 1582 | c = c.replace(/no-js/, 'js'); | 
| 1583 | document.body.className = c; | 
| 1584 | })(); | 
| 1585 | //]]> | 
| 1586 | </script> |