Phan\Language\Type::isScalar PHP Method

    public function isScalar() : bool
    {
        return in_array((string) $this, ['int', 'float', 'bool', 'true', 'string', 'null']);
    }

 /**
  * @return bool
  * True if this Type can be cast to the given Type
  * cleanly
  */
 public function canCastToType(Type $type) : bool
 {
     if ($this === $type) {
         return true;
     }
     $s = (string) $this;
     $d = (string) $type;
     if ($s[0] == '\\') {
         $s = substr($s, 1);
     }
     if ($d[0] == '\\') {
         $d = substr($d, 1);
     }
     if ($s === $d) {
         return true;
     }
     if ($s === 'int' && $d === 'float') {
         return true;
         // int->float is ok
     }
     if (($s === 'array' || $s === 'string' || strpos($s, '[]') !== false) && $d === 'callable') {
         return true;
     }
     if ($s === 'object' && !$type->isScalar() && $d !== 'array') {
         return true;
     }
     if ($d === 'object' && !$this->isScalar() && $s !== 'array') {
         return true;
     }
     if (strpos($s, '[]') !== false && $d === 'array') {
         return true;
     }
     if (strpos($d, '[]') !== false && $s === 'array') {
         return true;
     }
     if ($s === 'callable' && $d === 'closure') {
         return true;
     }
     if (($pos = strrpos($d, '\\')) !== false) {
         if ('\\' !== $this->getNamespace()) {
             if (trim($this->getNamespace() . '\\' . $s, '\\') == $d) {
                 return true;
             }
         } else {
             if (substr($d, $pos + 1) === $s) {
                 return true;
                 // Lazy hack, but...
             }
         }
     }
     if (($pos = strrpos($s, '\\')) !== false) {
         if ('\\' !== $type->getNamespace()) {
             if (trim($type->getNamespace() . '\\' . $d, '\\') == $s) {
                 return true;
             }
         } else {
             if (substr($s, $pos + 1) === $d) {
                 return true;
                 // Lazy hack, but...
             }
         }
     }
     return false;
 }