PHP - 计算特定的数组值

Question

How can I count the number of element inside an array with value equals a constant? example,

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

Answer 1

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

Answer 2

You can do this with array_keys<\/em> and count<\/em> .

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

Answer 3

To count a value in a two dimensional array, here is the useful snippet to process and get count of a particular value<\/strong> -

    <?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

Use the array_count_values function.

$countValues = array_count_values($myArray);

echo $countValues["Ben"];

Answer 5

Use array_count_values()<\/code> function . Check this link http:\/\/php.net\/manual\/en\/function.array-count-values.php<\/a>

"

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";

Answer 7

try the array_count_values() function

<?php
$array = array(1, "hello", 1, "world", "hello");
print_r(array_count_values($array));
?>

Answer 8

试试 PHP 函数array_count_values 。

Answer 9

If you want to count ALL the same occurences inside the array, here's a function to count them all, and return the results as a multi-dimensional array:

function countSame($array) {

$count = count($array);
$storeArray = array();
while ($count > 0) {
$count--;

if ($array[$count]) {
$a = $array[$count];
$counts = array_count_values($array);
$counts = $counts[$a];
$tempArray = array($a, $counts);
array_push($storeArray, $tempArray);

$keys = array_keys($array, $a);
foreach ($keys as $k) {
unset($array[$k]);
} //end of foreach ($keys as $k)
} //end of if ($array[$count])

} //end of while ($count > 0)

return $storeArray;

} //end of function countSame($array)

Answer 10

array_count_values only works for integers and strings. If you happen to want counts for float/numeric values (and you are heedless of small variations in precision or representation), this works:

function arrayCountValues($arr) {
  $vals = [];
  foreach ($arr as $val) { array_push($vals,strval($val)); }
  $cnts = array_count_values($vals);
  arsort($cnts);
  return $cnts;
}

Note that I return $cnts with the keys as strings. It would be easy to reconvert them, but I'm trying to determine the mode for the values, so I only need to re-convert the first (several) values.

I tested a version which looped, creating an array of counts rather than using array_count_values , and this turned out to be more efficient (by maybe 8-10%)!