警告：count（）期望至多2个参数，3给出

Question

如何使用count（）来统计一组数组中的所有元素？

$a[0] = 1; 
$a[1] = 3; 
$a[2] = 5; 
$b[0] = 2; 
$b[1] = 4; 
$b[2] = 6; 
$c[0] = 8; 
$c[1] = 9; 
$c[2] = 10; 
$result = count($a, $b, $c); 

echo $result; 

Answer 1

count()期望一个或两个参数，但你给它三个。

可以使用，

array_sum(array_map('count', [$a, $b, $c]));