The way PHP removes duplicate elements is to use the array_unique function, such as [array_unique($a)]. The array_unique function is a built-in function in PHP that removes duplicate values from an array.
The operating environment of this article: windows10 system, php 7.3, thinkpad t480 computer.
There are a large number of built-in functions in php, array_unique is one of them, this function allows us to easily delete duplicate elements in the array. Let's take a look at this function.
array_unique() function is used to remove duplicate values from an array. If two or more array values are the same, only the first value is retained, the other values are removed, and the filtered array is returned.
Code example:
<!DOCTYPE html>
<html>
<body>
<?php
$a=array("a"=>"red","b"=>"green","c"=>"red");
print_r(array_unique($a));
?>
</body>
</html> Running result:
Array ( [a] => red [b] => green )
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