如何用条件循环多维数组并在另一个Wordpress页面上计数

Question

我有一个来自Wordpress页面的数据库数组：

dev-user-20190424.php

<?php
$wb_users = array(
    array(

        "Username" => "Azmina",
        "Level" => "form-5",
        "School" => "KOLEJ D PATINGGI ABANG HJ ABDILLAH, SARAWAK",
        "SchoolID" => 4522,

    ),
    array(

        "Username" => "Gudako",
        "Level" => "form-5",
        "School" => "KOLEJ D PATINGGI ABANG HJ ABDILLAH, SARAWAK",
        "SchoolID" => 4522,

    ),
        array(

        "Username" => "Takatosaijo29",
        "Level" => "form-5",
        "School" => "SEKOLAH MENENGAH KEBANGSAAN BAHANG, SABAH",
        "SchoolID" => 4210,

    ),
    array(

        "Username" => "Obon",
        "Level" => "form-5",
        "School" => "SEKOLAH MENENGAH KEBANGSAAN BAHANG, SABAH",
        "SchoolID" => 4210,

    ),
    array(

        "Username" => "Rayana12",
        "Level" => "form-5",
        "School" => "SEKOLAH MENENGAH KEBANGSAAN BAHANG, SABAH",
        "SchoolID" => 4210,

    ),
    array(

        "Username" => "kaiyuanbeh",
        "Level" => "form-5",
        "School" => "SEKOLAH MENENGAH KEBANGSAAN PERMATANG RAWA, PULAU PINANG",
        "SchoolID" => 4250,

    ),
    array(

        "Username" => "Divyabharthi",
        "Level" => "form-5",
        "School" => "SEKOLAH MENENGAH KEBANGSAAN PETALING, WP KL",
        "SchoolID" => 4244,
    ),
    array(

        "Username" => "blackchocolatecake",
        "Level" => "form-4",
        "School" => "SEKOLAH MENENGAH KEBANGSAAN POI LAM, PERAK",
        "SchoolID" => 4375,

    ),
    );

因此，我试图实现的是通过循环数组$wb-用户来显示另一个WordPress页面上的用户总数，如果SchoolID与当前的用户学校id变量匹配，则计数它。然后，用户总数将显示在页面上。

Answer 1

我相信这基本上就是你要找的。

$schoolID = 4522;
$studentTotal = 0;
for ($i = 0; $i < count($wb_users); $i++) {
    if ($wb_users[$i]['SchoolID'] === $schoolID) {
        $studentTotal++;
    }
}

您需要在主数组中遍历数组。2.将“SchoolID”键与您的学校ID变量进行比较。3.当有匹配时，增加计数器。

Answer 2

用array_count_values和array_column怎么样？

$counts = array_count_values((array_column($wb_users, 'SchoolID')));
print_r($counts);

输出：

Array( 
        [4522] => 2 
        [4210] => 3 
        [4250] => 1 
        [4244] => 1 
        [4375] => 1 
)

演示： https://3v4l.org/hCvq5