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max ​

返回给定键的最大值。

获取最大值 ​

php
collect([10000, 20000, 30000])->max(); // 30000

通过 key 获取最大值 ​

php
collect([
    ['price' => 10000],
    ['price' => 20000], 
    ['price' => 30000]
])->max('price'); // 30000

自定义回调 ​

php
collect([
    ['price' => 10000, 'tax' => 500],
    ['price' => 20000, 'tax' => 700],
    ['price' => 30000, 'tax' => 900],
])->max(
    fn($value) => $value['price'] + $value['tax']
); // 30900

也可以在回调中返回 null 忽略某些不需要的值。

php
collect([
    ['price' => 10000, 'tax' => 500, 'active' => true],
    ['price' => 20000, 'tax' => 700, 'active' => true],
    ['price' => 30000, 'tax' => 900, 'active' => false],
])->max(
    fn ($value) => $value['active'] ?  $value['price'] + $value['tax'] : null
); // 20700

// 也可以先调用 filter 过滤掉不需要的数据
collect([
    ['price' => 10000, 'tax' => 500, 'active' => true],
    ['price' => 20000, 'tax' => 700, 'active' => true],
    ['price' => 30000, 'tax' => 900, 'active' => false],
])->filter(fn($item) => $item['active'])
    ->max(
        fn($value) => $value['price'] + $value['tax']
    );

相关方法 ​