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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 |
|---|---|
| 581 | * in $_REQUEST['history'] |
| 582 | * |
| 583 | * @param int $post_id |
| 584 | * @return bool |
| 585 | */ |
| 586 | function stream_preview_image( $post_id ) { |
| 587 | $post = get_post( $post_id ); |
| 588 | |
| 589 | /** This filter is documented in wp-admin/admin.php */ |
| 590 | @ini_set( 'memory_limit', apply_filters( 'admin_memory_limit', WP_MAX_MEMORY_LIMIT ) ); |
| 591 | |
| 592 | $img = wp_get_image_editor( _load_image_to_edit_path( $post_id ) ); |
| 593 | |
| 594 | if ( is_wp_error( $img ) ) { |
| 595 | return false; |
| 596 | } |
| 597 | |
| 598 | $changes = !empty($_REQUEST['history']) ? json_decode( wp_unslash($_REQUEST['history']) ) : null; |
| 599 | if ( $changes ) |