How to count the number of array elements in php, count the number of arrays in php_PHP tutorial

php method to count the number of array elements, php counts the number of arrays

count(): counts the number of elements in the array;

sizeof(): has the same purpose as count(). Both functions can return the number of array elements. You can get the number of elements in a regular scalar variable. If the array passed to this function is an empty Array, or a variable that has not been set, the number of array elements returned is 0;

array_count_value(): Count the number of times each specific value appears in the array $array;

For example:

  $array=array(4,5,1,2,3,1,2,1);
  $ac=array_count_value($array);

will create an array named $ac, which includes:

            关键字    值

             4     1

           5     1

           1     3

           2     2

           3     1

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$arr = array(
      '1011,1003,1008,1001,1000,1004,1012',
      '1009',
      '1011,1003,1111'
    );
$result = array();
foreach ($arr as $str) {
  $str_arr = explode(',', $str);
  foreach ($str_arr as $v) {
    $result[$v] = isset($result[$v]) ? $result[$v] : 0;
    $result[$v] = $result[$v] + 1;
  }
}
print_r($result);

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