当重写具有不同签名的方法时，为什么PHP不显示严格标准错误？

Question

I'm running on PHP Version 5.5.9-1ubuntu4.4

When I run file with code:

<?php
error_reporting(E_ALL);
ini_set('display_errors', 1);

class A
{
  public function f(array $array)
  {
    echo 'a';
  }
}

class B extends A
{
  public function f(A $a, array $b)
  {
    echo 'b';
  }
}

$a = new A();
$a->f([1, 2, 3]);
$b = new B();
$b->f($a, []);

I'm expecting to get a "Strict Standards" error, because I'm overloading metod with a different signature. But I didn't get any error or any warning message. Just normal output. Why?

Answer 1

It is possible that E_STRICT has been disabled in your php.ini file to supress errors such as this in legacy apps that are somewhat badly written when PHP was not standardised as it is now (though still not very standardised).

Also, in PHP versions BELOW 5.4.0, E_STRICT is not included in E_ALL. E_STRICT is only included in E_ALL in PHP versions 5.4.0 and above.

With strict errors, they are usually thrown at "compile time", so are thrown well before error_reporting is called, so would need to be set in php.ini