警告：count() 最多需要 2 个参数，给定 3 个
Warning: count() expects at most 2 parameters, 3 given
如何让 count() 计算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 $result;
count() 期望一个或两个参数，但你给了它三个。
可以使用，
array_sum(array_map('count', [$a, $b, $c]));
如何让 count() 计算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 $result;
count() 期望一个或两个参数，但你给了它三个。
可以使用，
array_sum(array_map('count', [$a, $b, $c]));