wireEmpty() function

Is the given value empty according to ProcessWire standards?

This works the same as PHP’s empty() function except for the following:

  • It returns true for Countable objects that have 0 items.
  • It considers whitespace-only strings to be empty.
  • It considers WireNull objects (like NullPage or any others) to be empty (3.0.149+).
  • It uses the string value of objects that can be typecast strings (3.0.150+).
  • You cannot pass it an undefined variable without triggering a PHP warning.

Available since version 3.0.143.


// behavior with Countable objects
$a = new WireArray();
empty($a); // PHP’s function returns false
wireEmpty($a); // PW’s function returns true
wireEmpty($a); // returns false, since there is now an item

// behavior with whitespace-only string
$s = '  ';
empty($s); // PHP’s function returns false
wireEmpty($s); // PW’s function returns true

// behavior with undefined variable $v
isset($v); // returns false
empty($v); // returns true
wireEmpty($v); // returns true but with PHP’s warning triggered


$bool = wireEmpty(mixed $value);



Value to test if empty

Return value


Functions methods and properties

API reference based on ProcessWire core version 3.0.185

Twitter updates

  • ProcessWire 3.0.192 (dev branch) contains 11 issue fixes and 5 pull requests, over 20 commits— More
    7 January 2022
  • ProcessWire 3.0.191 core updates: updates to the installer and the profile exporter module— More
    24 December 2021
  • This week ProcessWire went on a diet, trimming the core size from 15.5 MB down to 7.5 MB by moving optional site profiles into their own GitHub repos— More
    17 December 2021

Latest news

  • ProcessWire Weekly #402
    In the 402nd issue of ProcessWire Weekly we'll check out ProcessWire 3.0.193, highlight recent ProcessWire projects and resources, and more. Read on!
    Weekly.pw / 22 January 2022
  • ProcessWire 3.0.190 core updates
    ProcessWire 3.0.190 has 15 commits relative to 3.0.189 and contains a mixture of issue resolutions and feature additions. This post covers them all, in addition to updates for the PageAutosave and ProFields Table modules.
    Blog / 3 December 2021
  • Subscribe to weekly ProcessWire news

“We were really happy to build our new portfolio website on ProcessWire! We wanted something that gave us plenty of control on the back-end, without any bloat on the front end - just a nice, easy to access API for all our content that left us free to design and build however we liked.” —Castus, web design agency in Sheffield, UK