How php merges different array elements

This article mainly introduces "how php merges different array elements". In daily operation, I believe many people have doubts about how php merges different array elements. Xiaobian consulted all kinds of materials and sorted out simple and easy-to-use operation methods. I hope it will be helpful to answer the doubts about "how php merges different array elements". Next, please follow the editor to study!

Php merges different array elements: 1, create a PHP example file; 2, through "array_keys (array_flip ($a) + array_flip ($b) + array_flip ($c));" way to merge multiple arrays to remove duplicates.

This article operating environment: Windows7 system, PHP7.1 version, DELL G3 computer

How does php merge different array elements?

Most groups do not repeat

Array_keys (array_flip ($arr1) + array_flip ($arr2))

The array_keys () function returns a new array containing all the key names in the array.

If a second parameter is provided, only the key name whose key value is that value is returned.

Returns a new array containing all the key names in the array:

Running result:

Array ([a] = > red [b] = > green) Array ([0] = > Volvo [1] = > BMW [2] = > Toyota)

The technique of combining multiple arrays to remove duplicates

$a = array ('1001'); $b = array ('1002)); $c = array (' 1003)); $d = array_keys (array_flip ($a) + array_flip ($b) + array_flip ($c))

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