php merge arrays and remove duplicates

php method to merge arrays and remove duplicates: 1. Use the "array_merge" method or the " " symbol to merge arrays; 2. Use the "array_unique" function to merge arrays and remove duplicates.

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PHP Video Tutorial》

This article introduces the deduplication of one-dimensional arrays

Methods to merge arrays

1. array_merge:

Numeric key, add directly to the back, key reset
• String key, the value of the following array will replace the previous value

2, :

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);

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