ModeWeb Blog » PHP http://www.modeweb.co.uk/blog Web Development Tech Blog Sun, 25 Dec 2011 22:05:24 +0000 http://wordpress.org/?v=2.9.1 en hourly 1 PHP Boolean Rules http://www.modeweb.co.uk/blog/2011/12/php-boolean-rules/ http://www.modeweb.co.uk/blog/2011/12/php-boolean-rules/#comments Tue, 20 Dec 2011 19:46:03 +0000 Daniel http://www.modeweb.co.uk/blog/?p=93 When converting to boolean, the following values are considered FALSE:

  • the boolean FALSE itself
  • the integer 0 (zero)
  • the float 0.0 (zero)
  • the empty string, and the string “0″
  • an array with zero elements
  • an object with zero member variables (PHP 4 only)
  • the special type NULL (including unset variables)
  • SimpleXML objects created from empty tags

Every other value is considered TRUE (including any resource).

More information here

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