Php 按相同的顺序对数组中的连续重复元素进行计数

我需要对数组中的连续重复元素进行计数，但如果它们是非连续的，我也要对它们进行计数，使它们的顺序与它们相同

例如，我有流动数组：

$array = Array('a', 'b', 'a', 'a', 'a', 'c', 'c', 'b', 'b', 'a', 'a', 'a', 'a');

如果我使用数组\计数\值函数 例如：

输出将是：

Array ( [a] => 8 [b] => 3 [c] => 2 )

但我需要得到如下输出：

element   counted value
    a       1
    b       1
    a       3
    c       2
    b       2
    a       4

---

您可以迭代数组，在值相同时计数，在值不同时将值推送到结果数组：

$result = [];
$count = 0;
$current = $array[0];
for ($i = 0; $i < count($array); $i++) {
    if ($array[$i] == $current) {
        $count++;
    }
    else {
        $result[] = array($current, $count);
        $count = 1;
    }
    $current = $array[$i];
}
$result[] = array($current, $count);
print_r($result);

---

从一个数组开始，第一项来自源，计数为1，然后从第二项开始，检查它是否与当前输出中的项匹配。如果匹配则添加1，如果不匹配则添加新条目

$array = Array ('a','b','a','a','a','c','c','b','b','a','a','a','a');
$output = [ ["element" => $array[0], "count" => 1 ] ];
$outputPoint = 0;
for ( $i = 1, $count = count($array); $i < $count; $i++ )   {
    if ( $array[$i] == $output[$outputPoint]["element"] )  {
        $output[$outputPoint]["count"]++;
    }
    else    {
        $output[++$outputPoint] = ["element" => $array[$i], "count" => 1 ];
    }
}
print_r($output);

---

这将在数组中循环并以$count为单位递增元素数

该数组看起来像：

Array
(
    [0] => Array
        (
            [element] => a
            [counted_value] => 1
        )

    [1] => Array
        (
            [element] => b
            [counted_value] => 1
        )

    [2] => Array
        (
            [element] => a
            [counted_value] => 3
        )

    [3] => Array
        (
            [element] => c
            [counted_value] => 2
        )

    [4] => Array
        (
            [element] => b
            [counted_value] => 2
        )

    [5] => Array
        (
            [element] => a
            [counted_value] => 4
        )

)

---

你需要使用循环。到目前为止，你有没有尝试过什么？非常非常类似于这个答案的是缺少教育性的解释。在这个看似未经测试的片段中有一个打字错误。此外，in_数组是在php中检查数组值的性能最低的方法之一。

$array = Array ('a','b','a','a','a','c','c','b','b','a','a','a','a');
$output = [ ["element" => $array[0], "count" => 1 ] ];
$outputPoint = 0;
for ( $i = 1, $count = count($array); $i < $count; $i++ )   {
    if ( $array[$i] == $output[$outputPoint]["element"] )  {
        $output[$outputPoint]["count"]++;
    }
    else    {
        $output[++$outputPoint] = ["element" => $array[$i], "count" => 1 ];
    }
}
print_r($output);

Array
(
    [0] => Array
        (
            [element] => a
            [count] => 1
        )

    [1] => Array
        (
            [element] => b
            [count] => 1
        )

    [2] => Array
        (
            [element] => a
            [count] => 3
        )

    [3] => Array
        (
            [element] => c
            [count] => 2
        )

    [4] => Array
        (
            [element] => b
            [count] => 2
        )

    [5] => Array
        (
            [element] => a
            [count] => 4
        )

)

$array = ['a','b','a','a','a','c','c','b','b','a','a','a','a'];

$count = [];
$crt   = -1;
foreach($array ?? [] as $element) {
    if($crt == -1 || $count[$crt]["element"] != $element) {
        $count[++$crt] = ["element" => $element, "counted_value" => 1];
    } else {
        $count[$crt]["counted_value"]++; 
    }
}

Array
(
    [0] => Array
        (
            [element] => a
            [counted_value] => 1
        )

    [1] => Array
        (
            [element] => b
            [counted_value] => 1
        )

    [2] => Array
        (
            [element] => a
            [counted_value] => 3
        )

    [3] => Array
        (
            [element] => c
            [counted_value] => 2
        )

    [4] => Array
        (
            [element] => b
            [counted_value] => 2
        )

    [5] => Array
        (
            [element] => a
            [counted_value] => 4
        )

)

$out = array();
$cnt = -1;
foreach($array as $val)
{
   if(in_array($val,$out))
   {
        $out[] = $var;
        $finalArr[$cnt]['cnt'] = count($out);
   }else{
        $out = array();
        $out[] = $val;
        $finalArr[] = array('ele'=>$val,'cnt'=>count($out));
        $cnt++;
   }
}
print_r($finalArr);