在php中找到特定多维数组值的max() [英] find max() of specific multidimensional array value in php

问题描述

例如查看数组:此处

See array for example: here

基本上，我想在该数组中找到 array[]['time'] 的 max().如果我遍历它，我可以弄清楚，但我希望有一个更优雅的解决方案.

Basically, I want to find the max() for array[]['time'] in that array. I can figure it out if I loop through it, but I was hoping there was a more elegant solution.

推荐答案

如果您想在数组上迭代计算某个值，请考虑 array_reduce:

Think array_reduce if you want to compute some single value iteratively over an array:

$max = array_reduce($array, function($a, $b) { 
  return $a > $b['time'] ? $a : $b['time']; 
} );

或者你可以使用一个实用函数，例如:

Or you could make use of a utility function like:

function array_col(array $a, $x)
{
  return array_map(function($a) use ($x) { return $a[$x]; }, $a);
}

这将被用作:

$max = max(array_col($array, 'time'));

它更通用，可以用于其他类似的事情.

It's more general purpose and could be used for other similar things.

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