PHP 字符型数字去掉小数点后的零

<?php
    function _floatVal($val){
        if(is_numeric($val)){
            return floatval($val);
        }else{
            return $val;
        }
    }

    $list = array(
        'a'=>'0.00',
        'b'=>'3.00',
        'c'=>'236.30',
        'd'=>'aa',
    );
        
    $list = array_map('_floatVal',$list);
    echo "<pre>";
    var_dump($list);
?>