PHP 中对数组分组
PHP 没有任何内置函数可以对数组进行分组，但可以使用循环来实现。
对数组进行分组有助于按单个属性对数组项进行分组。
在 PHP 中使用 foreach 循环按特定属性对数组进行分组
<?php
$data_array = array(
array(
"Name" => "Mark",
"Gender" => "Male",
"EmployeeType" => "FullTime"
),
array(
"Name" => "Monica",
"Gender" => "Female",
"EmployeeType" => "FullTime"
),
array(
"Name" => "John",
"Gender" => "Male",
"EmployeeType" => "PartTime"
),
array(
"Name" => "Michelle",
"Gender" => "Female",
"EmployeeType" => "PartTime"
)
);
$grouped_array = array();
foreach ($data_array as $element) {
$grouped_array[$element['Gender']][] = $element;
}
$grouped_array1 = array();
foreach ($data_array as $element) {
$grouped_array1[$element['EmployeeType']][] = $element;
}
echo "Array grouped according to gender: <br>";
print_r($grouped_array);
echo "<br><br>Array grouped according to employee type: <br>";
print_r($grouped_array1);
?>输出：
Array grouped according to gender:
Array (
[Male] => Array (
[0] => Array ( [Name] => Mark [Gender] => Male [EmployeeType] => FullTime )
[1] => Array ( [Name] => John [Gender] => Male [EmployeeType] => PartTime ) )
[Female] => Array (
[0] => Array ( [Name] => Monica [Gender] => Female [EmployeeType] => FullTime )
[1] => Array ( [Name] => Michelle [Gender] => Female [EmployeeType] => PartTime ) ) )
Array grouped according to employee type:
Array (
[FullTime] => Array (
[0] => Array ( [Name] => Mark [Gender] => Male [EmployeeType] => FullTime )
[1] => Array ( [Name] => Monica [Gender] => Female [EmployeeType] => FullTime ) )
[PartTime] => Array (
[0] => Array ( [Name] => John [Gender] => Male [EmployeeType] => PartTime )
[1] => Array ( [Name] => Michelle [Gender] => Female [EmployeeType] => PartTime ) ) )
我们将阵列排列成多行。输出显示两个数组，一个根据 Gender，另一个是 EmployeeType。
在 PHP 中使用 group_array() 创建一个可以对给定数组进行分组的函数
我们可以将上面的代码转换为函数，然后放入值。
<?php
function group_array($property, $data) {
$grouped_array = array();
foreach($data as $value) {
if(array_key_exists($property, $value)){
$grouped_array[$value[$property]][] = $value;
}else{
$grouped_array[""][] = $value;
}
}
return $grouped_array;
}
echo "Array grouped according to gender: <br>";
print_r(group_array("Gender", $data_array));
echo "<br><br>Array grouped according to employee type: <br>";
print_r(group_array("EmployeeType", $data_array));
?>我们创建一个函数 group_array()，它有两个参数，一个是属性或键，另一个是数组。
输出：
Array grouped according to gender:
Array (
[Male] => Array (
[0] => Array ( [Name] => Mark [Gender] => Male [EmployeeType] => FullTime )
[1] => Array ( [Name] => John [Gender] => Male [EmployeeType] => PartTime ) )
[Female] => Array (
[0] => Array ( [Name] => Monica [Gender] => Female [EmployeeType] => FullTime )
[1] => Array ( [Name] => Michelle [Gender] => Female [EmployeeType] => PartTime ) ) )
Array grouped according to employee type:
Array (
[FullTime] => Array (
[0] => Array ( [Name] => Mark [Gender] => Male [EmployeeType] => FullTime )
[1] => Array ( [Name] => Monica [Gender] => Female [EmployeeType] => FullTime ) )
[PartTime] => Array (
[0] => Array ( [Name] => John [Gender] => Male [EmployeeType] => PartTime )
[1] => Array ( [Name] => Michelle [Gender] => Female [EmployeeType] => PartTime ) ) )
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