Query: array_unique
OS: php
Section: 3
Format: Original Unix Latex Style Formatted with HTML and a Horizontal Scroll Bar
ARRAY_UNIQUE(3) 1 ARRAY_UNIQUE(3) array_unique - Removes duplicate values from an arraySYNOPSISarray array_unique (array $array, [int $sort_flags = SORT_STRING])DESCRIPTIONTakes an input $array and returns a new array without duplicate values. Note that keys are preserved. array_unique(3) sorts the values treated as 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. Note Two elements are considered equal if and only if (string) $elem1 === (string) $elem2 i.e. when the string representation is the same, the first element will be used.PARAMETERSo $array - The input array. o $sort_flags - The optional second parameter $sort_flags may be used to modify the sorting behavior using these values: Sorting type flags: o SORT_REGULAR - compare items normally (don't change types) o SORT_NUMERIC - compare items numerically o SORT_STRING - compare items as strings o SORT_LOCALE_STRING - compare items as strings, based on the current locale.RETURN VALUESReturns the filtered array.CHANGELOG+--------+---------------------------------------------------+ |Version | | | | | | | Description | | | | +--------+---------------------------------------------------+ |5.2.10 | | | | | | | Changed the default value of $sort_flags back to | | | SORT_STRING. | | | | | 5.2.9 | | | | | | | Added the optional $sort_flags defaulting to | | | SORT_REGULAR. Prior to 5.2.9, this function used | | | to sort the array with SORT_STRING internally. | | | | +--------+---------------------------------------------------+EXAMPLESExample #1 array_unique(3) example <?php $input = array("a" => "green", "red", "b" => "green", "blue", "red"); $result = array_unique($input); print_r($result); ?> The above example will output: Array ( [a] => green [0] => red [1] => blue ) Example #2 array_unique(3) and types <?php $input = array(4, "4", "3", 4, 3, "3"); $result = array_unique($input); var_dump($result); ?> The above example will output: array(2) { [0] => int(4) [2] => string(1) "3" }SEE ALSOarray_count_values(3).NOTESNote Note that array_unique(3) is not intended to work on multi dimensional arrays. PHP Documentation Group ARRAY_UNIQUE(3)
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