How PHP counts the number of array elements

This article mainly introduces the PHP statistical array of elements of the method of the relevant data, the need for friends can refer to the following

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

sizeof (): and Count () have the same purpose, 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 the function is an empty array, or is an array of variables that are not set, the number of elements returned is 0;

Array_count_value (): Counts the number of occurrences of each particular value in the array $array;

Such as:

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

An array named $ac is created, which includes:

            Keyword    value             4     1           5     1           1     3           2     2           3     1

Send a Netizen's train of thought, also very good

$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);