PHP array_unique() Function

The array_unique() is used to remove duplicate values from an array.

Note: The keys are preserved. array_unique() sorts the values treated as a string at first, then will keep the first key encountered for every value, and ignore all following keys. It does not mean that the key of the first related value from the unsorted array will be kept.

Parameter Description
array Required. Specifying an array
sortingtype Optional. Specifies how to compare the array elements/items. Possible values:

  • SORT_STRING – Default. Compare items as strings
  • SORT_REGULAR – Compare items normally (don’t change types)
  • SORT_NUMERIC – Compare items numerically
  • SORT_LOCALE_STRING – Compare items as strings, based on current locale




$array = array("a"=>"Cooper","b"=>"Samuel","c"=>"Cooper", "d"=>"Cooper");


Array ( [a] => Cooper [b] => Samuel ) 

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