Can you create instance properties dynamically in PHP?

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Sort of. There are magic methods that allow you to hook your own code up to implement class behavior at runtime:

class foo {
  public function __get($name) {
    return('dynamic!');
  }
  public function __set($name, $value) {
    $this->internalData[$name] = $value;
  }
}

That’s an example for dynamic getter and setter methods, it allows you to execute behavior whenever an object property is accessed. For example

print(new foo()->someProperty);

would print, in this case, “dynamic!” and you could also assign a value to an arbitrarily named property in which case the __set() method is silently invoked. The __call($name, $params) method does the same for object method calls. Very useful in special cases. But most of the time, you’ll get by with:

class foo {
  public function __construct() {
    foreach(getSomeDataArray() as $k => $value)
      $this->{$k} = $value;
  }
}

…because mostly, all you need is to dump the content of an array into correspondingly named class fields once, or at least at very explicit points in the execution path. So, unless you really need dynamic behavior, use that last example to fill your objects with data.

This is called overloading
http://php.net/manual/en/language.oop5.overloading.php

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