[英]Print unique values from an array column as a comma-separated string
I want to print all unique Department
values from a multidimensional array as a comma-separated string, but not all rows have a Department
value.我想将多维数组中的所有唯一
Department
值打印为逗号分隔的字符串,但并非所有行都有Department
值。
The boiled down version of my array looks like this:我的数组的简化版本如下所示:
$employee = [
["employee_id" => 1, "Department" => "Tech"],
["employee_id" => 2, "Department" => "Tech"],
["employee_id" => 3],
["employee_id" => 4, "Department" => "Tech"],
["employee_id" => 5],
["employee_id" => 6, "Department" => "Crm"],
["employee_id" => 7],
["employee_id" => 8, "Department" => "Crm"],
["employee_id" => 9, "Department" => "Crm"],
["employee_id" => 10],
["employee_id" => 11, "Department" => "Crm"],
["employee_id" => 12, "Department" => "Crm"]
];
I tried with:我试过:
for ($i=0; $i < count($employee); $i++) {
print_r(array_unique($employee[$i]['Department']));
}
But I generate Warnings when I try to access a non-existent Department value.但是当我尝试访问不存在的部门值时会生成警告。
Expected output:预期 output:
Tech,Crm
<?php
echo implode(",",array_unique(array_column($employee,'Department')));
Use array_column
to filter values of Department
column and use array_unique()
to have unique values of Department
. 使用
array_column
过滤Department
列的值,并使用array_unique()
获得Department
唯一值。 Now, just implode()
them based on ,
. 现在,只需基于
,
它们implode()
。
You can avoid calling array_unique()
after array_column()
by repeating its second parameter as its third parameter.您可以通过将第二个参数作为第三个参数重复来避免在
array_column()
array_unique()
。 PHP does no allow duplicate kays on the same level as an array. PHP 不允许在与阵列相同的级别上重复 kay。 When a repeated Department is encountered, the old value is replaced with its newer, identical value.
当遇到重复的部门时,旧值将替换为其更新的相同值。
echo implode(',', array_column($employee, 'Department', 'Department'));
// Tech,Crm
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