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[TOC]

# 問題描述
~~~
$lastYear=[
$lastYear=[
            6345.75,
            5454.54,
            5235.14,
            7313.45,
            25353.47,
            5235.86
        ];

$thisYear=[
    4345.75,
    1325.75,
    1325.75,
    2367.77,
    3432.76,
    4646.86
];
~~~
這是去年上半年的盈利和今年上半年的盈利,我們要對比這個

# 常規寫法
```
$profit=[];

foreach ($thisYear as $key=>$monthly){
    $profit[]=$monthly-$lastYear[$key];
}

dd($profit);
```

# collection

我們要處理2個數組,用到zip
~~~
$profit=collect($thisYear)->zip($lastYear);
~~~
把2個數組壓成一個
~~~
$profit=collect($thisYear)->zip($lastYear)->map(function($value){
            //用第一個元素減去最后一個元素
            return $value->first()-$value->last();
        });

dump($profit);
~~~


                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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