PHP 是否具有与 Python 的列表理解语法等效的语法? [英] Does PHP have an equivalent to Python's list comprehension syntax?

问题描述

Python 具有语法上甜蜜的列表推导式:

Python has syntactically sweet list comprehensions:

S = [x**2 for x in range(10)]
print S;
[0, 1, 4, 9, 16, 25, 36, 49, 64, 81]

在 PHP 中，我需要做一些循环:

In PHP I would need to do some looping:

$output = array();
$Nums = range(0,9);

foreach ($Nums as $num) 
{
    $out[] = $num*=$num;
}
print_r($out);

获得:

数组([0] => 0[1] => 1[2] => 4[3] => 9[4] => 16[5] => 25[6] => 36[7] => 49[8] => 64[9] => 81)

Array ( [0] => 0 [1] => 1 [2] => 4 [3] => 9 [4] => 16 [5] => 25 [6] => 36 [7] => 49 [8] => 64 [9] => 81 )

无论如何在PHP中获得类似的列表理解语法?无论如何，是否可以使用 PHP 5.3 中的任何新功能来实现?

Is there anyway to get a similar list comprehension syntax in PHP? Is there anyway to do it with any of the new features in PHP 5.3?

谢谢！

推荐答案

也许是这样?

$out=array_map(function($x) {return $x*$x;}, range(0, 9))

这将适用于 PHP 5.3+，在旧版本中，您必须为 array_map 定义回调分开

This will work in PHP 5.3+, in an older version you'd have to define the callback for array_map separately

function sq($x) {return $x*$x;}
$out=array_map('sq', range(0, 9));

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