Php 在内爆时，是否将数组的round（）内容精确到特定级别？

我有一个数组，里面有这样的内容

$numbers = array(0.49882,0.20510,0.50669,0.20337,0.45878,0.08703,0.43491,0.74491,0.26344,0.37994);

我需要将上述数组

内爆（）

由于数组中可能有数百个数字，如何以最有效的方式实现这一点？
使用
数组\u map
中的函数：

$numbers = array_map(function($v) { return round($v, 2); }, $numbers)

您可以使用before to
内爆（）
：

或者使用
数字\u格式（）
：

还可以使用，它将第二个参数中的函数应用于数组中的每个元素：

<?php
$numbers = array(0.49882,0.20510,0.50669,0.20337,0.45878,0.08703,0.43491,0.74491,0.26344,0.37994);
array_walk($numbers, function (&$el) {
    $el = round($el, 2);
});
var_dump($numbers);
echo implode(", ", $numbers);


$serial = implode(',', array_map(function($v){return number_format($v,2);}, $numbers)) ;
// 0.50,0.21,0.51,0.20,0.46,0.09,0.43,0.74,0.26,0.38

<?php
$numbers = array(0.49882,0.20510,0.50669,0.20337,0.45878,0.08703,0.43491,0.74491,0.26344,0.37994);
array_walk($numbers, function (&$el) {
    $el = round($el, 2);
});
var_dump($numbers);
echo implode(", ", $numbers);

array (size=10)
  0 => float 0.5
  1 => float 0.21
  2 => float 0.51
  3 => float 0.2
  4 => float 0.46
  5 => float 0.09
  6 => float 0.43
  7 => float 0.74
  8 => float 0.26
  9 => float 0.38

0.5, 0.21, 0.51, 0.2, 0.46, 0.09, 0.43, 0.74, 0.26, 0.38