如何通过子数组值对多维数组进行分组并在PHP中重新分配键

Question

我查看了所有类似的问题和示例（有很多），但仍然无法使其正常工作（尽管我认为我很接近）。

我有一组从文本文件中提取的员工时间表...

schedule.txt：

123，乔，20120208,0845,1645 123，乔，20120209,0800,1600 456,苏,20120208,0900,1700 456,苏,20120209,0700,1500 ...

我生成数组的代码是：

$schedule = file_get_contents('./schedule.txt'); $s = explode("\n", $schedule); 对于 ($i = 0; $i

输出是：

大批 ( [0] => 数组 ( [0] => 123 [1] => 乔 [2] => 20120208 [3] => 0845 [4] => 1645 ) [1] => 数组 ( [0] => 123 [1] => 乔 [2] => 20120209 [3] => 0800 [4] => 1600 ) [2] => 数组 ( [0] => 456 [1] => 苏 [2] => 20120208 [3] => 0900 [4] => 1700 ) [3] => 数组 ( [0] => 456 [1] => 苏 [2] => 20120209 [3] => 0700 [4] => 1500 ) )

我试图在一个新的多维数组中按 ID 对员工进行分组，输出如下：

大批 ( [123] => 数组 ( [0] => 数组 ( [0] => 乔 [1] => 20120208 [2] => 0845 [3] => 1645 ) [1] => 数组 ( [0] => 乔 [1] => 20120209 [2] => 0800 [3] => 1600 ) ) [456] => 数组 ( [0] => 数组 ( [0] => 苏 [1] => 20120208 [2] => 0900 [3] => 1700 ) [1] => 数组 ( [0] => 苏 [1] => 20120209 [2] => 0700 [3] => 1500 ) ) )

我一生都无法思考如何将现有数组更改为这个新的（不同的）输出...... 我正在尝试这个但一无所获：

$newArr = 数组（）； foreach($s as $k => $v) { if(!isset($newArr[$v[0]])) { $newArr[$v[0]] = array(); } $newArr[$v[0]][] = array($v[0]); }

虽然我现在的输出是：

大批 ( [123] => 数组 ( [0] => 数组 ( [0] => 123 ) [1] => 数组 ( [0] => 123 ) ) [456] => 数组 ( [0] => 数组 ( [0] => 456 ) [1] => 数组 ( [0] => 456 ) ) )

有什么想法吗？我知道我的代码中缺少某些内容：

$newArr[$v[0]][] = array($v[0]);

我尝试将其更改为：

$newArr[$v[0]][] = 数组(0 => $v[1], 1 => $v[2], 2 => $v[3], 3 => $v[4]) ;

这给了我正确的输出，但我现在得到未定义的偏移错误。另外，如果子数组中的键数发生变化，这段代码现在仅限于我明确输入的 4 个...

Answer 1

如果我理解正确的话，这就足够了：)

$lines = file('./schedule.txt');

$employees = array();
foreach ($lines as $line)
{
    $chunks = explode(',', $line);
    $employees[$chunks[0]][] = array_slice($chunks, 1);
}

print_r($employees);

Answer 2

有一个名为fgetcsv 的函数可以轻松获取逗号分隔值。不需要自己做。

此代码还解决了您的问题并正确处理空行：

if (($handle = fopen("schedules.csv", "r")) !== FALSE) {

    $schedules = array();
    while (($data = fgetcsv($handle)) !== FALSE) {
        if ($data[0] !== null) { //blank lines return an array containing null
            $schedules[$data[0]][] = array_slice($data, 1);
        }
    }
    fclose($handle);

    //do what you need to

} else {
    // file failed to open
}

请注意，我将文件命名为 .csv 而不是 .txt。我建议您将逗号分隔值的内容保存为 .csv 文件。甚至可以定义文件中每一列的内容。

Answer 3

<?php
//read the file into an array with each line being an entry
$schedule = file('./schedule.txt');
//empty array
$s = array();
//loop through file lines
foreach($schedule as $row){
    //explode on comma
    $row = explode(",", trim($row));
    //if the id doesn't exist yet...
    if(!isset($s[$row[0]])){
        //...make it an empty array
        $s[$row[0]] = array();
    }
    //add the row under the id
    $s[$row[0]][] = $row;
}
print_r($s);
?>

Answer 4

你可以使用fscanf:

$handle    = fopen('./schedule.txt', 'r');
$employees = array();
while ($line = fscanf($handle, '%d,%s')) {
  $employees[$line[0]][] = explode(',', $line[1]);
}
fclose($handle);

print_r($employees);