Example of php array combination and deduplication

In our daily development process, we cannot avoid dealing with arrays. So the most we deal with is array merging, but not only array merging but also no duplication, so today we will introduce you to php in detail An example of combining arrays and removing duplicates!

Methods to merge arrays

1. array_merge：

• Numeric key, add directly to the back, key reset

• String key, the value of the subsequent array will replace the previous value

+:

• Numeric key, the value of the following array will not replace the previous value

• String key, The value of the following array will replace the previous value

Merge arrays and remove duplicates

//1.单数组去重复
    array_unique($arrTest)//2.多数组去重复
    array_keys(array_flip($arr1)+array_flip($arr2))

Test function

        $arr1 = [1,2,3,4,5];        
        $arr2 = [1,2,3,6,7];        
        $arr3 = ['0'=>1,'1'=>2,'2'=>3,'3'=>4,'4'=>5];        
        $arr4 = ['0'=>1,'1'=>2,'2'=>3,'3'=>6,'4'=>7];        
        $arr5 = ['0'=>1,'a'=>2,'b'=>3,'c'=>4,'4'=>5];        
        $arr6 = ['0'=>1,'a'=>2,'c'=>3,'d'=>6,'4'=>7];
        dump(array_merge($arr1, $arr2));
        dump($arr1+$arr2);
        dump(array_keys(array_flip($arr1)+array_flip($arr2)));        
        echo &#39;<br>&#39;;
        dump(array_merge($arr3, $arr4));
        dump($arr3+$arr4);
        dump(array_keys(array_flip($arr3)+array_flip($arr4)));        
        echo &#39;<br>&#39;;
        dump(array_merge($arr5, $arr6));
        dump($arr5+$arr6);

## Summary:

This article uses the merging and deduplication of

one-dimensional arrays. You can consider based on this article if it is a two-dimensional array What about mergers? This article can serve as a starting point and I hope it will be helpful to you!

Related recommendations:

php array merge array_merge() function usage precautions

How to merge PHP arrays?

Two methods of php array merging

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