PHP - 计算特定的数组值

Question

如何计算数组中元素的数量,其值等于常量？例,

$myArray = array("Kyle","Ben","Sue","Phil","Ben","Mary","Sue","Ben");

我怎么能直接知道里面有多少"本"？

Answer 1

$array = array("Kyle","Ben","Sue","Phil","Ben","Mary","Sue","Ben");
$counts = array_count_values($array);
echo $counts['Ben'];

Answer 2

您可以使用array_keys和count来执行此操作.

$array = array("blue", "red", "green", "blue", "blue");
echo count(array_keys($array, "blue"));

输出:

3

Answer 3

要计算二维数组中的值，这里是处理和获取特定值计数的有用片段-

    <?php
    
    $list = [
      ['id' => 1, 'userId' => 5],
      ['id' => 2, 'userId' => 5],
      ['id' => 3, 'userId' => 6],
    ];

    $userId = 5;
    
    echo array_count_values(array_column($list, 'userId'))[$userId]; // outputs: 2
    

Answer 4

使用array_count_values函数.

$ countValues = array_count_values($ myArray);

echo $countValues["Ben"];

Answer 5

使用array_count_values()功能.请查看此链接http://php.net/manual/en/function.array-count-values.php

Answer 6

define( 'SEARCH_STRING', 'Ben' );

$myArray = array("Kyle","Ben","Sue","Phil","Ben","Mary","Sue","Ben");

$count = count(array_filter($myArray,function($value){return SEARCH_STRING === $value;}));

echo $count, "\n";

输出：

3