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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 |
|---|---|
| 3543 | * Convert a screen string to a screen object |
| 3544 | * |
| 3545 | * @since 3.0.0 |
| 3546 | * |
| 3547 | * @param string $screen The name of the screen |
| 3548 | * @return object An object containing the safe screen name and id |
| 3549 | */ |
| 3550 | function convert_to_screen( $screen ) { |
| 3551 | $screen = str_replace( array('.php', '-new', '-add' ), '', $screen); |
| 3552 | $screen = (string) apply_filters( 'screen_meta_screen', $screen ); |
| 3553 | $screen = (object) array('id' => $screen, 'base' => $screen); |
| 3554 | return $screen; |
| 3555 | } |
| 3556 | |
| 3557 | function screen_meta($screen) { |
| 3558 | global $wp_meta_boxes, $_wp_contextual_help, $title; |
| 3559 | |
| 3560 | if ( is_string($screen) ) |
| 3561 | $screen = convert_to_screen($screen); |