How to remove duplicates in php arrays
This article mainly explains "how to duplicate the php array". Interested friends may wish to have a look at it. The method introduced in this paper is simple, fast and practical. Let's let the editor take you to learn how to duplicate the php array.
1. Description
The arrray_unique function is used to remove duplicates from an array, and if more than two array values are the same, only the first value is retained.
The php5.2.9 version adds array_unique 's support for multi-dimensional groups, and the sort_flags parameter needs to be set to deal with multi-dimensional groups.
2. Grammar
Array_unique (array)
3. Parameters
Array
Sortingtype
4. Return value
Returns the filtered array.
5. Examples
One-dimensional array deduplicates:
Array_unique (array) $arr = array_unique ($classify)
Two-dimensional array deduplication:
Function assoc_unique ($arr, $key) {$tmp_arr = array (); foreach ($arr as $k = > $v) {if (in_array ($v [$key], $tmp_arr)) {unset ($arr [$k]);} else {$tmp_arr [] = $v [$key];} sort ($arr); return $arr } $aa = Array (Array (0 = > 1pint 1 = >'c'), Array (0 = > 2pint 1 = >'c'), Array (0 = > 3pint 1 = >'q'), Array (0 = > 1pint 1 = >'B'), Array (0 = > 2pint 1 = >'d'), Array (0 = > 3pint 1 = >'d'), Array (0 = > 4pm 1 = >'a'), Array (0 = > 6pm 1 = >'B'), Array (0 = > 6prima 1 = >'d')) # assoc_unique (array, de-health value); echo ""; print_r (assoc_unique ($aa,0))
When we use the array, we will find some duplicate elements, if we do not remove them, it will affect the subsequent use.
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