php - How many instances of a class have been created
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Solution:
You can implement this using a static variable in your class, which you keep updated via it's constructor and destructor. Here is how:
class MyClass {
public static $instanceCount = 0;
function __construct() {
self::$instanceCount++;
}
function __destruct() {
self::$instanceCount--;
}
}
// create 3 instances
$a = new MyClass();
$b = new MyClass();
$c = new MyClass();
echo MyClass::$instanceCount; // outputs: 3
// implicitly lose one instance (destructor is called)
$a = "test";
echo MyClass::$instanceCount; // outputs: 2
Answer
Solution:
You can try get_defined_vars function
It returns an array with defined vars, then you'll need to loop through the array an count by class. To get the class of a given variable you can use get_class function.
Maybe something like this:
function countVars() {
$varsDefined = [];
foreach(get_defined_vars() as $v) {
$varClass = get_class($v);
if (!isset($varsDefined[$varClass])) $varsDefined[$varClass] = 0;
$varsDefined[$varClass]++;
}
return $varsDefined;
}
I could´t test the code so it could have some mistakes, but I think the idea is there :)
Hope it helps!
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