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Other PHP Types

Object: standard O-O notion of data values plus methods 

// creating an object of class foo
$x = new foo;  $x->method(1,'a');

Resource: special type for references to external resources

  • e.g. database connections/cursors, file handles, ...
NULL: a distinguished value NULL (or null, case-insensitive)
  • used to indicate that a variable exists but has no value
  • related functions: isset($v), unset($v), $v = null