$page->isChanged() method

Has the Page changed since it was loaded?

To check if only a specific property on the page has changed, specify the property/field name as the first argument. This method assumes that change tracking is enabled for the Page (as it is by default). Pages that are new (i.e. don't yet exist in the database) always return true.

Examples

// Check if page has any changes
if($page->isChanged()) {
  // There are changes to this page
  $changes = $page->getChanges();
}
// When page is about to be saved, update summary when body has changed
$this->addHookBefore('Pages::saveReady', function($event) {
  $page = $event->arguments('page');
  if($page->isChanged('body')) {
    // get first 300 chars from body
    $summary = substr($page->body, 0, 300);
    // truncate to position of last period
    $period = strrpos($summary, '.');
    if($period) $summary = substr($summary, 0, $period);
    // populate to the page, so that summary is also saved
    $page->summary = $summary;
  }
});

Usage

// basic usage
$bool = $page->isChanged();

// usage with all arguments
$bool = $page->isChanged(string $what = '');

Arguments

NameType(s)Description
what (optional)string

If specified, only checks the given property for changes rather than the whole page.

Return value

bool

True if property has changed, false if not.

See Also


$page methods and properties

API reference based on ProcessWire core version 3.0.133

Twitter updates

  • ProcessWire 3.0.133 adds a useful new Page::meta() method for a new type of page-specific persistent data storage, adds the ability for users to create their own bookmarks in Lister, and has a handy and time saving update for the asmSelect input type— More
    14 June 2019
  • New post: This week we’ll take a look at 3 different WEBP image strategies that you can use in ProcessWire 3.0.132+. Then we’ll dive into a major update for the Google Client API module, and finish up by outlining some useful new updates in FormBuilder— More
    31 May 2019
  • New post: This week we've added WEBP support in ProcessWire thanks to a GitHub pull request from Horst Nogajski. This enables you to have highly optimized image output in PW and I think you’ll really like the difference it makes— More
    24 May 2019

Latest news

  • ProcessWire Weekly #266
    In the 266th issue of ProcessWire Weekly we're going to take a closer look at ProcessWire 3.0.133 (dev), introduce a third party module called Repeater Images, and highlight a recently released site belonging to the Australian Antarctic Division. Read on!
    Weekly.pw / 15 June 2019
  • ProcessWire 3.0.133 core updates
    ProcessWire 3.0.133 adds a useful new $page->meta() method for a new type of page-specific persistent data storage, adds the ability for users to create their own bookmarks in Lister, and has a handy and time saving update for the asmSelect input type. Read on for all the details, examples and screenshots.
    Blog / 14 June 2019
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