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Lucy Weatherford
Lucy Weatherford

Reputation: 5544

Count Function in php for JSON object

In php, would the function count work also on a JSON object? Will it return the number of elements in the object? Or does this function only work for an array? 

count($varJSONobject);

Upvotes: 0

Views: 759

Answers (1)

user895378
user895378

Reputation:

There's no such thing as a JSONobject in PHP (unless it's some user-defined something or other). There are only arrays or stdClass instances generated by json_decodedocs, which can be used with count.

It's possible to make an object respond to count by having the object implement the Countabledocs interface.

For the sake of completeness, consider the following count results:

$test = new stdClass;
$test->prop1 = 1;
$test->prop2 = 1;
var_dump(count($test)); // 1

$test = (array) $test;
var_dump(count($test)); // 2

class CountTest {
  public $prop1 = 1;
  public $prop2 = 1;
}

$test = new CountTest;
var_dump(count($test)); // 1

$test = (array) $test;
var_dump(count($test)); // 2

// class implementing Countable
class CountMe implements Countable { 
  protected $myCount = 3; 
  public function count(){ 
     return $this->myCount; 
  }
}
$test = new CountMe;
var_dump(count($test)); // 3

Upvotes: 3

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