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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 |
|---|---|
| 528 | * in $_REQUEST['history'] |
| 529 | * |
| 530 | * @param int $post_id |
| 531 | * @return boolean |
| 532 | */ |
| 533 | function stream_preview_image( $post_id ) { |
| 534 | $post = get_post( $post_id ); |
| 535 | |
| 536 | /** This filter is documented in wp-admin/admin.php */ |
| 537 | @ini_set( 'memory_limit', apply_filters( 'admin_memory_limit', WP_MAX_MEMORY_LIMIT ) ); |
| 538 | |
| 539 | $img = wp_get_image_editor( _load_image_to_edit_path( $post_id ) ); |
| 540 | |
| 541 | if ( is_wp_error( $img ) ) |
| 542 | return false; |
| 543 | |
| 544 | $changes = !empty($_REQUEST['history']) ? json_decode( wp_unslash($_REQUEST['history']) ) : null; |
| 545 | if ( $changes ) |
| 546 | $img = image_edit_apply_changes( $img, $changes ); |