SQLで書く。
$tel = "09012349999";
$customer = Customer::where(DB::raw('concat(tel01,tel02,tel03)'), $tel)->first();
[Laravel] クエリーにCONCATを使う
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$tel = "09012349999";
$customer = Customer::where(DB::raw('concat(tel01,tel02,tel03)'), $tel)->first();