PHP で UserAgent 判断するやつ

ua.class.php

<?php

class UA {
  public $ua = '';

  public function __construct() {
    if (isset($_SERVER['HTTP_USER_AGENT'])) {
      $this->ua = $_SERVER['HTTP_USER_AGENT'];
    }
  }

  public function original() {
    return $this->ua;
  }

  public function is_pc() {
    if (!$this->is_mobile() && !$this->is_smartphone()) {
      return true;
    } else {
      return false;
    }
  }

  public function is_ios() {
    if (preg_match('/iPhone|iPad/i', $this->ua)) {
      return true;
    } else {
      return false;
    }
  }

  public function is_android() {
    if (preg_match('/Android/i', $this->ua)) {
      return true;
    } else {
      return false;
    }
  }

  public function is_mobile() {
    $uas = array(
            'DoCoMo',
            'KDDI',
            'DDIPOKET',
            'UP.Browser',
            'J-PHONE',
            'Vodafone',
            'SoftBank',
            );

    foreach ($uas as $val) {
      $str = "/".$val."/i";
      if (preg_match($str, $this->ua)){
        return true;
      }
    }
    return false;
  }

  public function is_smartphone () {
    $uas = array(
            'Windows Phone',  // Windows Phone
            'iPhone',         // Apple iPhone
            'iPod',           // Apple iPod touch
            'dream',          // Pre 1.5 Android
            'CUPCAKE',        // 1.5+ Android
            'blackberry',     // blackberry
            'webOS',          // Palm Pre Experimental
            'Tizen',          // Tizen
            'incognito',      // Other iPhone browser
            'webmate'         // Other iPhone browser
            );

    foreach ($uas as $val) {
      $str = "/".$val."/i";
      if (preg_match($str, $this->ua)){
        return true;
      }
    }
    
    // iPad is not smartphone
    if (preg_match("/iPad/i", $this->ua)) {
        return false;
    }
    
    // Android Mobile, Firefox OS and other mobile browsers
    if ((!$this->is_mobile()) && preg_match("/Mobile/i", $this->ua)) {
      return true;
    }

    return false;
  }
}