更改数组PHP中的索引[重复]答案

【问题标题】：Changing index in arrays PHP [duplicate]更改数组PHP中的索引[重复]
【发布时间】：2019-07-14 19:55:52
【问题描述】：

大家好，

我的任务是更改数组中的索引。这是我的代码：

$file = Storage::get('upload/test.txt');
$lines = explode('\n', $file);
$array = array_map(function($line) {
    return explode(',', $line);
}, $lines);
print_r($array);

输出是：

数组 ( [0] => 数组 ( [0] => 约翰 [1] => 男性 [2] => 20 [3] => 200 [4] => 174 )

    [1] => Array
        (
            [0] => joe
            [1] => male
            [2] => 24
            [3] => 157
            [4] => 166
        )

    [2] => Array
        (
            [0] => bea
            [1] => female
            [2] => 18
            [3] => 153
            [4] => 160
        )

    [3] => Array
        (
            [0] => edd
            [1] => male
            [2] => 30
            [3] => 180
            [4] => 180
        )

)

我需要做的是：

数组 ( [0] => 数组 ( [名称] => 约翰 [性别] => 男性 [年龄] => 20 [身高] => 200 [重量] => 174 )

    [1] => Array
        (
            [name] => joe
            [sex] => male
            [age] => 24
            [height] => 157
            [weight] => 166
        )

    [2] => Array
        (
            [name] => bea
            [sex] => female
            [age] => 18
            [height] => 153
            [weight] => 160
        )

    [3] => Array
        (
            [name] => edd
            [sex] => male
            [age] => 30
            [height] => 180
            [weight] => 180
        )

)

提前致谢！ :)

【问题讨论】：

标签： php arrays indexing foreach

【解决方案1】：

一种可能的解决方案是创建一个新数组，遍历当前数组并添加索引：

$new_array = array();

foreach ($array as $element) {
    $new_array[] = array(
        'name' => $element[0],
        'sex' => $element[1],
        'age' => $element[2],
        'height' => $element[3],
        'weight' => $element[4]
    );

    $i++;
}

【讨论】：

@jediArvin 尝试时发生了什么？

【解决方案2】：

你想要一个关联数组。

$newArray = []; // create a new empty array to store your associative arrays.

// Loop through each element in array.
foreach($array as $aPerson) {
  // map each element in array into an associative array.
  $person = [
    "name" => $aPerson[0],
    "sex" => $aPerson[1],
    "age" => $aPerson[2],
    "height" => $aPerson[3],
    "weight" => $aPerson[4]
  ];
  // Add your associative array to your new re-indexed array.
  array_push($newArray, $person);
}

我希望这会有所帮助。

以下应该以您想要的格式打印数组。

print_r($newArray);

【讨论】：

【解决方案3】：

简单，像这样：

$arr =     [
    ['joe','male',24,157,166]
];

 #mind the & pass by refrence
foreach($arr as &$item){
    $item = array_combine(['name','sex','age','height','weight'],$item);
}

print_r($arr);

输出

Array
(
    [0] => Array
        (
            [name] => joe
            [sex] => male
            [age] => 24
            [height] => 157
            [weight] => 166
        )

)

Sandbox

注意如果两个数组大小不同，array_combine 会爆炸。

你也可以这样做（84 字节）

$arr =     [['joe','male',24,157,166]];

$headers = ['name','sex','age','height','weight'];

$arr = array_map(function($item)use($headers){return array_combine($headers,$item);},$arr);

print_r($arr);

同样的输出

Sandbox

【讨论】：

【解决方案4】：

这就是我将如何做你想要实现的目标

<?php
$fp = @fopen('upload/test.txt', 'r'); $props = ['name', 'sex', 'age', 'height', 'weight']; $r = [];
if($fp) {
  while(($line = fgets($fp)) !== false) {
    $x = explode(',', $line); $a = [];
    foreach($props as $k => $v){
      $a[$v] = $x[$k];
    }
    $r[] = $a;
  }
  fclose($fp);
}
print_r($r);
?>

【讨论】：