How PHP gets the length of an array or the number of times a value occurs _php tips

This example describes how PHP gets the length of an array or how many times a value appears. Share to everyone for your reference. The specific analysis is as follows:

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

For example:

$arr = Array (' 0 ', ' 1 ', ' 2 ', ' 3 ', ' 4 ');
echo count ($arr); Output 5

sizeof () and count () have the same purpose, both functions can return the number of elements in an array. You can get the number of elements in a regular scalar quantity, if the array passed to the function is an empty array, or a variable that is 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;
For example:

$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

I hope this article will help you with your PHP program design.