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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 |
---|---|
445 | /** |
446 | * Streams image in post to browser, along with enqueued changes |
447 | * in $_REQUEST['history'] |
448 | * |
449 | * @param int $post_id |
450 | * @return boolean |
451 | */ |
452 | function stream_preview_image( $post_id ) { |
453 | $post = get_post( $post_id ); |
454 | @ini_set( 'memory_limit', apply_filters( 'admin_memory_limit', WP_MAX_MEMORY_LIMIT ) ); |
455 |
|
456 | $img = wp_get_image_editor( _load_image_to_edit_path( $post_id ) ); |
457 |
|
458 | if ( is_wp_error( $img ) ) |
459 | return false; |
460 |
|
461 | $changes = !empty($_REQUEST['history']) ? json_decode( wp_unslash($_REQUEST['history']) ) : null; |
462 | if ( $changes ) |
463 | $img = image_edit_apply_changes( $img, $changes ); |