PHPを使ってUAでiPhone判定ができます。
<?php
$index_iphone = strpos($_SERVER['HTTP_USER_AGENT'],"iPhone");
$is_iphone = false;
if ($index_iphone !== false){
$is_iphone = true;
}
if($is_iphone == true){
$css="./layout/iphone.css";
} else {
$css="./layout/pc.css";
}
?>
<link rel="stylesheet" type="text/css" href="<?php echo $css; ?>"/>
$index_iphone = strpos($_SERVER['HTTP_USER_AGENT'],"iPhone");
$is_iphone = false;
if ($index_iphone !== false){
$is_iphone = true;
}
if($is_iphone == true){
$css="./layout/iphone.css";
} else {
$css="./layout/pc.css";
}
?>
<link rel="stylesheet" type="text/css" href="<?php echo $css; ?>"/>
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