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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 |
|---|---|
| 579 | * Filters the legacy (pre-3.5.0) media buttons. |
| 580 | * |
| 581 | * Use {@see 'media_buttons'} action instead. |
| 582 | * |
| 583 | * @since 2.5.0 |
| 584 | * @deprecated 3.5.0 Use {@see 'media_buttons'} action instead. |
| 585 | * |
| 586 | * @param string $string Media buttons context. Default empty. |
| 587 | */ |
| 588 | $legacy_filter = apply_filters( 'media_buttons_context', '' ); |
| 589 | |
| 590 | if ( $legacy_filter ) { |
| 591 | // #WP22559. Close <a> if a plugin started by closing <a> to open their own <a> tag. |
| 592 | if ( 0 === stripos( trim( $legacy_filter ), '</a>' ) ) |
| 593 | $legacy_filter .= '</a>'; |
| 594 | echo $legacy_filter; |
| 595 | } |
| 596 | } |
| 597 | |