php - 分组 PHP 数组编号

Question

我如何改变这一点：

大批
(
    [0] => 1
    [1] => 2
    [2] => 3
    [3] => 4
    [4] => 5
    [5] => 6
    [6] => 7
    [7] => 11
    [8] => 21
    [9] => 22
    [10] => 23
    [11] => 24
)

对此：

1-7、11、21-24

我在 PHP 数组中有一个这样的数字列表，我只是想让这个列表更小一点。

2000 年：3 6 7 11 15 17 25 36 42 43 45
2001 年：2 3 4 5 6 9 10 11 12 13 34 37 45 46 47 48 49 50 51 52
2002：1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 33 34 35 36 37 39 40 41 42 43 48 49 45 51 52
2003 年：1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 451 42 473 48 4 46 50 51
2004 年：1 2 3 4 5 6 7 8 9 10 11 12 13 14 16 17 18 19 21 22 23 24 25 26 27 28 29 30 31 32 33 34 36 37 38 39 40 41 42 45 44 49 5046 52
2005 年：1 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 451 42 4 4 4 46 50 51 52
2006 年：1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 46 42 74 4 49 50 51 52
2007 年：1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 474 4 4 41 46 474 49 50 51 52

score 6 · Accepted Answer

有趣的任务。

这是一个完全符合您要求的演示脚本。

调整口味。

代码

<?php

$groups = array();
$active_group = 0;

$output = array();
$output_counter = 0;

$nums = array( 1, 2, 3, 4, 5, 6, 7, 11, 21, 22, 23, 24 );


foreach( $nums as $k => $num ) {

    // if this isn't the first item, and the current number
    // isn't one more than the previous one, increment the counter
    if( $k !== 0 && $nums[$k] !== $nums[$k-1]+1 )
        $active_group ++;

    // add this number to a group
    $groups[ $active_group ][] = $num;

}


// take the 1st and last of each group
foreach( $groups as $group ) {

    $first = array_shift( array_values($group) );
    $output[$output_counter][] = $first;

    $last = array_pop( array_values($group) );
    if( $first !== $last )
        $output[$output_counter][] = $last;

    $output_counter++;

}


echo '<pre>';
print_r($output);

?>

输出

Array
(
    [0] => Array
        (
            [0] => 1
            [1] => 7
        )

    [1] => Array
        (
            [0] => 11
        )

    [2] => Array
        (
            [0] => 21
            [1] => 24
        )

)

score 1 · Accepted Answer

一个循环就可以了。您需要跟踪“先前”迭代的值和存储范围数据的“起始”值。

代码：

$prev = -1;                                                    // initialize out of range
foreach ($numbers as $n) {
    if (!isset($start)) {                                      // first iteration
        $start = $n;                                           // declare $start
    } elseif ($n != $prev + 1) {                               // not consecutive
        $result[] = $start == $prev ? $prev : "$start-$prev";  // store single or ranged values
        $start = $n;                                           // update $start
    }
    $prev = $n;                                                // declare / update $prev
}
$result[] = $start == $prev ? $prev : $start . '-' . $prev;    // store final iteration data
echo implode(', ', $result);                                   // comma delimit the values

输出$numbers = [1, 2, 3, 4, 5, 6, 7, 11, 21, 22, 23, 24];：（演示）

1-7, 11, 21-24

输出$numbers = [1, 3, 5, 6, 11, 21, 22, 23, 24, 26];：（演示）

1, 3, 5-6, 11, 21-24, 26

score 0 · Accepted Answer

这是一种将整数数组压缩为您想要的字符串格式并将该字符串格式扩展回整数数组的方法。

function compress($expanded) {
    $low = -1;
    $prevNum = -1;
    $expanded = array_unique($expanded);
    sort($expanded, SORT_NUMERIC);
    foreach($expanded as $num) {
        if($low == -1) {
            $low = $num;
        } else if($num - $prevNum > 1) { 
            $compact[] = ($prevNum - $low >= 1) ? sprintf("%d-%d", $low, $prevNum) : $prevNum; 
            $low = $num;
        } 
        $prevNum = $num;
    }
    if($low != -1 ) {
        $compact[] = ($num - $low >= 1) ? sprintf("%d-%d", $low, $num) : $num; 
    }
    return implode(",", $compact);
}

public static function expand($compact) {
    $expanded = Array();
    $compact = explode(",", $compact);
    foreach($compact as $num) {
        if( is_numeric($num) ) {
            $expanded[] = $num;
        } else {
            list($low, $high) = explode("-", $num);
            if( is_numeric($low) && is_numeric($high) && $low < $high) {
                for($i = $low;$i <= $high;$i++) {
                    $expanded[] = $i;
                }
            }
        }
    }
    return $expanded;
}

score -2 · Accepted Answer

//Placeholder array
$b = array();

// Slice array (where to slice)
$s = array(11, 21);

foreach ($array as $year => $a) {
    for($i = 0; $i < count($a); $i++) {
        for($ii = 0; $ii < count($s); $ii++) {
            if($i == 0) {
                $b[$year]['<' . $s[$ii]][] = $a[$i];
                break;
            } else if ( isset($a[$i+1]) && $a[$i] < $s[$ii] && $a[$i+1] >=$s[$ii]){
                $b[$year]['<' . $s[$ii]][] = $a[$i];
                if (isset($s[$ii+1])) {
                    $b[$year]['<' . $s[$ii+1]][] = $a[$i+1];
                } else {
                    $b[$year]['>' . $s[$ii]][] = $a[$i+1];
                }
                break;
            } else if ( !isset($s[$ii+1]) && $i == count($a) - 1) {
                $b[$year]['>' . $s[$ii]][] = $a[$i];
                break;
            }
        }
    }
}

$数组

The list of numbers

输出（$b）：

array
  2000 => 
    array
      '<11' => 
        array
          0 => int 3
          1 => int 7
      '<21' => 
        array
          0 => int 11
          1 => int 17
      '>21' => 
        array
          0 => int 25
          1 => int 45
  2001 => 
    array
      '<11' => 
        array
          0 => int 2
          1 => int 10
      '<21' => 
        array
          0 => int 11
          1 => int 13
      '>21' => 
        array
          0 => int 34
          1 => int 52
  2002 => 
    array
      '<11' => 
        array
          0 => int 1
          1 => int 10
      '<21' => 
        array
          0 => int 11
          1 => int 20
      '>21' => 
        array
          0 => int 21
          1 => int 52
  2003 => 
    array
      '<11' => 
        array
          0 => int 1
          1 => int 10
      '<21' => 
        array
          0 => int 11
          1 => int 20
      '>21' => 
        array
          0 => int 21
          1 => int 51
  2004 => 
    array
      '<11' => 
        array
          0 => int 1
          1 => int 10
      '<21' => 
        array
          0 => int 11
          1 => int 19
      '>21' => 
        array
          0 => int 21
          1 => int 52
  2005 => 
    array
      '<11' => 
        array
          0 => int 1
          1 => int 10
      '<21' => 
        array
          0 => int 11
          1 => int 20
      '>21' => 
        array
          0 => int 21
          1 => int 52
  2006 => 
    array
      '<11' => 
        array
          0 => int 1
          1 => int 10
      '<21' => 
        array
          0 => int 11
          1 => int 20
      '>21' => 
        array
          0 => int 21
          1 => int 52
  2007 => 
    array
      '<11' => 
        array
          0 => int 1
          1 => int 10
      '<21' => 
        array
          0 => int 11
          1 => int 20
      '>21' => 
        array
          0 => int 21
          1 => int 52

注意：只需更改值 (11) 和 (21) 以满足您的需要。您可以添加更多值。

score -4 · Accepted Answer

这是一个例子：

$query = "SELECT '1-11' Range, COUNT(rank) rank 
    FROM promoted WHERE rank between 1 and 11 
    union all 
    SELECT '12-21' Range, COUNT(rank) rank 
    from promoted 
    where rank between 12 and 21 
    union all 
    SELECT '22-31' Range, count(rank) rank 
    from promoted 
    where rank between 22 and 31 
    union all 
    SELECT '32-40' Range, count(rank) rank 
    from promoted 
    where rank between 22 and 31 
    union all 
    SELECT rank, count(rank) FROM promoted WHERE rank = '40'";

php - 分组 PHP 数组编号

5 回答 5

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