How to remove duplicates from one-dimensional array in php

How to remove duplicate values ​​from a one-dimensional array in php: first create a PHP sample file; then define a one-dimensional array; and finally remove duplicates through the "array_unique($arraytest);" method.

The operating environment of this article: windows7 system, PHP7.1 version, DELL G3 computer

array_unique(): Remove Duplicate items in the array, only applies to one-dimensional arrays

It is not like the sort() method,

eg: $arraytest = array('tommy ','tommy','abcd');

sort($arraytest) ;

# Print_r ($ Arraytest) ;

$arraytest = array('tommy','tommy','abcd');

$arraytest = array_unique($arraytest);

print_r($arraytest);

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