- $this->opera = stristr($HTTP_USER_AGENT, 'opera');
- $this->ns4 = stristr($HTTP_USER_AGENT, 'mozilla/4') && !stristr($HTTP_USER_AGENT, 'msie');
- $this->ns = ($this->ns4 || stristr($HTTP_USER_AGENT, 'netscape'));
- $this->ie = stristr($HTTP_USER_AGENT, 'compatible; msie') && !$this->opera;
- $this->mz = stristr($HTTP_USER_AGENT, 'mozilla/5');
- $this->khtml = stristr($HTTP_USER_AGENT, 'khtml');
- $this->safari = ($this->khtml || stristr($HTTP_USER_AGENT, 'safari'));
+ $this->opera = strpos($HTTP_USER_AGENT, 'opera') !== false;
+ $this->ns4 = strpos($HTTP_USER_AGENT, 'mozilla/4') !== false && strpos($HTTP_USER_AGENT, 'msie') === false;
+ $this->ns = ($this->ns4 || strpos($HTTP_USER_AGENT, 'netscape') !== false);
+ $this->ie = !$this->opera && strpos($HTTP_USER_AGENT, 'compatible; msie') !== false;
+ $this->mz = !$this->ie && strpos($HTTP_USER_AGENT, 'mozilla/5') !== false;
+ $this->chrome = strpos($HTTP_USER_AGENT, 'chrome') !== false;
+ $this->khtml = strpos($HTTP_USER_AGENT, 'khtml') !== false;
+ $this->safari = !$this->chrome && ($this->khtml || strpos($HTTP_USER_AGENT, 'safari') !== false);