Question

基本上，我从API获取数据，并且API具有重复的数字。我想计算this.postCollection = this.afs.collection< post > ('posts')中的重复数字，但由于某种原因它不起作用。我不确定我做错了什么。您可以多次查看foreach次。查看图片如何打印。它应该显示类似的东西

代码：

Array
(
    [33] => 5
    [2] => 3
)

Answer 1

您的代码的根本缺陷是您使用一个值并对其进行格式化，然后将其放入数组然后执行 $username = ""; $password = ""; if(!empty($_POST['username']) && !empty($_POST['password'])){ $username = $_POST['username']; $password = $_POST['password']; } $usr = "123"; $pwd = "123"; $invalidLogin = 'Incorrect Username and/or Password. Please try again.'; if ($password == $pwd && $username == $usr){ session_start(); $_SESSION['loggedin'] = true; header('Location: memberPage.php'); }else{ echo '<script type="text/javascript">'; echo 'alert("Incorrect Username and/or Password. Please try again.");'; echo 'window.location.href = "memberLogin.html";'; echo '</script>'; } 就可以了。

看到区别：

<?php
    session_start();
    if ($_SESSION['loggedin'] != true){
        header('memberLogin.html');
    }
?>

<!DOCTYPE html>
<!--Rest of the HTML code--!>

首先打印array_count_values：

$arr = [33, 32, 23, 33, 22, 23, 32, 33, 33];

print_r(array_count_values($arr));

foreach($arr as $a) {
    $currentp= number_format($a, 6);
    $array = array($currentp);
    $vals = array_count_values($array);
    print_r($vals);

}

print_r内Array ( [33] => 4 [32] => 2 [23] => 2 [22] => 1 )打印：

print_r

你意识到差异吗？

我想，你需要的是

foreach

哪个输出：

Array([33.000000] => 1)
Array([32.000000] => 1)
Array([23.000000] => 1)
Array([33.000000] => 1)
Array([22.000000] => 1)
Array([23.000000] => 1)
Array([32.000000] => 1)
Array([33.000000] => 1)
Array([33.000000] => 1)

Answer 2

不确定为什么使用number_format()，但我猜你需要这样的东西

$num_array = []; // Initialize number array
foreach ($parsed_json1->numbers as $item) {
    $ui = $item->no;
    $currentp= number_format($ui, 6);
    $num_array[] = $currentp; // Store each number first to number array
}
// After foreach loop, do array_count_values to number array
$vals = array_count_values($num_array);
print_r($vals); //Print result

计算foreach中的重复数字

2 个答案: