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<a href="<?php if (ua_smt() == true): echo $appli_a_sp; else: echo $appli_a_pc; endif; ?>">

<?php

  function ua_smt () {
    $ua = $_SERVER['HTTP_USER_AGENT'];
    if (preg_match('/iPhone|iPad|iPod|Android|Windows Phone|BlackBerry/', $ua)) {
      $smt = true;
    } else {
      $smt = false;
    }
    return $smt;
  }

?>

<?php

  function ua_smt () {
    $ua = $_SERVER['HTTP_USER_AGENT'];
    if (preg_match('/iPhone|iPad|iPod|Android|Windows Phone|BlackBerry/', $ua)) {
      $smt = true;
    } else {
      $smt = false;
    }
    return $smt;
  }

?>