PHP从数组中获取单个值

Question

I hava a variable like $data= $regression->getCoefficients(); in Regression Analysis. When i print this i got this output

Regression\\Matrix Object ( [rows:protected] => 4 [columns:protected] => 1 [MainMatrix:protected] => Array ( [0] => Array ( [0] => -125 ) [1] => Array ( [0] => 9.8888888888869 ) [2] => Array ( [0] => 18.75 ) [3] => Array ( [0] => -1.1388888888905 ) ) )

But i need to get single value from array like Array[0]=>-125 or -125

Thank you in advance

Answer 1

You should look into Regression\\Matrix methods as Mark Baker suggests in the comment: there should be some method exposing the protected MainMatrix member.

And if there isn't any... looks like object can be typecasted into (associative) array and the protected members have keys prefixed with chr(0).'*'.chr(0) (see @fardelian's comment here ). It would be rather against the Regression\\Matrix design, but you can write an "exposer":

function getProtectedValue($obj,$name) {
  $array = (array)$obj;
  $prefix = chr(0).'*'.chr(0);
  return $array[$prefix.$name];
}

(You could achieve the same in less hacky, but more bulky way using reflection .)

Now you can access your desired value as

$data = $regression->getCoefficients();
$MainMatrix = getProtectedValue($data,"MainMatrix");
echo $MainMatrix[0][0]; // -125