Question

我有一个像这样的MySQL表;

╔════╦═══════════════════════╗
║ id ║ comma_separated_stuff ║
╠════╬═══════════════════════╣
║  1 ║ 1, 2, 3, 4, 5         ║
║  2 ║ 1, 2, 5               ║
║  3 ║ 3, 7                  ║
║  4 ║ 4, 8                  ║
╚════╩═══════════════════════╝

我设法将每一行作为数组[0]，数组[1]，数组[2]和数组[3]进入数组。问题是如何计算“有多少逗号分隔数组包含 - 例如 - '5'？”

Answer 1

<?php
//how many of the comma-separated-arrays include for example '5'
$array = array(
'1, 2, 3, 4, 5',
'1, 2, 5',
'3, 7',
'4, 8',
);

$n = 5;
$sum = 0;
//Split the strings to arrays of numbers
foreach($array as $value)
{
    $data = explode(', ', $value);
    if (in_array($n, $data))
    {
        ++$sum;
    }
}

//prints 2
print $sum;

Answer 2

以下两个示例，如果您想通过以下方式计算数组本身中的键数：

<?php

$a[0] = '1, 2, 3, 4, 5';
$a[1] = '1, 2, 5';
$a[2] = '3, 7 ';
$a[3] = '4, 8';

$resulta = count($a);
print $resulta;// Output 4
?>

另一个：

 <?php
 $b = array ('1, 2, 3, 4, 5','1, 2, 5' ,'3, 7','4, 8');

 $resultb = count($b);

 print $resultb;// Output 4
 ?>

如果您想从字符串中计算逗号数量，请

以下一个：

    $text = 'This , is, , a , test a,a,';
    echo substr_count($text, ','); // Output 6 , will give the number of comma in each one

如何计算从数据库表中检索到的包含PHP中特定值的逗号分隔数组

2 个答案: