紧凑型（）与上PHP手册数组声明 [英] compact() vs manual array declaration on php

问题描述

我通常使用 PHP从变量数组建设紧凑型（）功能。另外，我可以手动创建数组。有那些用途的任何优点或缺点？我分享双方在以下段这些声明的例子：

紧凑型用法

 ＆LT; PHP
    $名称=约翰;
    $姓=李四;
    紧凑的（'名'，'姓'）;
？＆GT;
 

输出：

  ['名'=＆GT;'约翰'，'姓'=＆GT;'李四']
 

---

手册数组声明

 ＆LT; PHP
$名称=约翰;
$姓=李四;
$数据=阵列（名= GT; $名字，姓= GT; $姓）;
？＆GT;
 

输出：

  ['名'=＆GT;'约翰'，'姓'=＆GT;'李四']
 

解决方案

我觉得它更preference的问题。

使用

如果我有一堆局部变量的声明，我正好希望我的数组键被命名为同样的方式，紧凑是很有帮助的。

我不觉得这是如此经常虽然。通常情况下，我定义的数组，它是更为复杂的：

  $阵列= [
    '富'=＆GT; $ something-＆GT;富（）
    '酒吧'=＆GT; $吧，
    巴兹'=＆GT; A_CONSTANT
];
 

要使用紧凑在这里你必须定义变量 $ foo的 $酒吧和 $巴兹第一，这似乎是愚蠢的。

我喜欢紧凑，我不觉得这是各地有益的大部分时间。

性能

好吧，我不得不去做到这一点。这里是一个非常基本的非科学的绩效对比：

https://3v4l.org/WTrOJ

总之，使用紧凑是一个量级慢。

然而，你必须使用它100,000（在这个例子中）要重要的一秒钟的一小部分。

在换句话说，使用什么最有意义您code。不要担心了令人难以置信的小的性能差异！

I am usually using compact() function of php for the building array from the variables. Also, I can create that array manually. Are there any pros or cons of those usages? I am sharing an examples both of those declarations on the following segment:

Compact Usage

   <?php 
    $name = "John";
    $surname = "Doe";
    compact('name','surname');
?>

Output:

['name'=>'John','surname'=>'Doe']

---

Manual Array Declaration

<?php 
$name = "John";
$surname = "Doe";
$data = array("name"=>$name,"surname"=>$surname);
?>

Output:

['name'=>'John','surname'=>'Doe']

解决方案

I think it's more a matter of preference.

Uses

If I have a bunch of local variables declared, and I happen to want my array keys to be named the same way, compact is very helpful.

I don't find that to be the case very often though. Typically I'm defining an array that is more complex:

$array = [
    'foo' => $something->foo(),
    'bar' => $bar,
    'baz' => A_CONSTANT
];

To use compact here you'd have to define your variables $foo $bar and $baz first, which seems silly.

I like compact, I just don't find it to be all around helpful most of the time.

Performance

Ok I had to go do it. Here's a very basic non-scientific performance comparison:

https://3v4l.org/WTrOJ

In short, using compact is an order of magnitude slower.

And yet, you have to use it 100,000 (in this example) to matter a tiny fraction of a second.

In other words: use what makes the most sense for your code. Don't worry about the incredibly small performance difference!

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