count php

1<?php
2	$arr = ["one", "two", "three", "four"];
3	echo count($arr);
4  ?>

1count($myArray);

1$sql = "SELECT COUNT(*) AS total from Members";
2$result = $conn->query($sql);
3$data =  $result->fetch_assoc();
4echo $data['total'];

1$cars = array("Volvo","BMW","Toyota");
2echo count($cars); // 3

1<?php
2$cars=array("Volvo","BMW","Toyota");
3echo count($cars);
4?>

1
2<?php
3$a[0] = 1;
4$a[1] = 3;
5$a[2] = 5;
6var_dump(count($a));
7
8$b[0]  = 7;
9$b[5]  = 9;
10$b[10] = 11;
11var_dump(count($b));
12
13var_dump(count(null));
14
15var_dump(count(false));
16?>
17  /* result
18  
19  
20int(3)
21int(3)
22
23Warning: count(): Parameter must be an array or an object that implements Countable in … on line 12 // as of PHP 7.2
24int(0)
25
26Warning: count(): Parameter must be an array or an object that implements Countable in … on line 14 // as of PHP 7.2
27int(1)
28
29*/
30
31