PHP haltig engine warnings to PHPStan levels

all.php

<?php
/**
 * https://wiki.php.net/rfc/engine_warnings
 */
 
// old-Level: Message > new-Level | phpstan-level

#$o = null;
// Warning: Creating default object from empty value > Error: Attempt to assign property "p" on null | 2
#$o->p = 0;

// Notice: Trying to get property '%s' of non-object > Warning | 2
#echo (0)->p;

#class std {}
#$x = new std;
// Notice: Undefined property: %s::$%s > Warning | 2 (but not for stdClass/object)
#print_r($x->y);

#$o = 0;
// Warning: Cannot use a scalar value as an array > Error | 3
#$o[0] = 0;

// Notice: Trying to access array offset on value of type %s > Warning | 3
#echo (0)[0];

// Warning: Invalid argument supplied for foreach() = Warning | 3
#foreach ("" as $c) {}

// Notice: Object of class stdClass could not be converted to int = Notice | 2
print_r((new stdClass) == 1);

// Warning: A non-numeric value encountered > ERROR | 2
#echo 0 + "1s";

$x = '1';
// Warning: Cannot assign an empty string to a string offset > Error | ?
$x[0] = '';


/* Warning: count() Parameter muste be an array or an object that implements Countable > Error | 5 */
#count(new stdClass);

/* Error: Call to a member function %s() on null = Error | 2 */
#(null)->m();


# PHP 7.1 < Error: [] operator not supported for strings | 3
#$x = '';
#$x[] = null;
#print_r($x);