PHP Gets the duplicate element instance tutorial in the array

1. Gets the duplicated elements in an array. The code is as follows:

A. Method I:

The code is as follows
function Array_repeat ($arr) { if (!is_array ($arr)) return $arr; $arr 1 = array_count_values ($arr); $NEWARR = Array (); foreach ($arr 1 as $k => $v) { if ($v >1) Array_push ($NEWARR, $k); } return $NEWARR; }

B. Method II:

The code is as follows
function Array_repeat ($arr) { if (!is_array ($arr)) return $arr; $arr 1 = array_unique ($arr); $arr 3 = Array_diff_key ($arr, $arr 1); Return Array_unique ($arr 3); }

Test method

The code is as follows
$arr = Array (' Apple ', ' blue ', ' red ', ' banana ', ' pear ', ' apple ', ' blue ', ' color ', ' color '); Print_r (Array_repeat ($arr)); Result: Array ([5] => Apple [6] => Blue [8] => color)

Later on, some ways to delete an array of repeating elements

Array_keys function to delete an array repeating element.

*/

The code is as follows

$a =array ("Red", "green", "blue", "yellow"); Count ($a); Get 4 unset ($a [1]); Delete a second element Count ($a); Get 3 echo $a [2]; There are only three elements in the array, and you want to get the last element, but get blue, echo $a [1]; No value Array array_splice (array input, int offset [, int length [, array replacement]]) Array_splice () is actually a function that replaces an array element, but simply deletes the element without replacing it. The following is the use of Array_splice (): $b =array ("Red", "green", "blue", "yellow"); Array_splice ($a, 1, 1);

Let's look at a more comprehensive deletion of duplicate values and delete the specified array elements

code as follows

$array 1 = array (1 => "Www.45it.net", 2 => "Pineapple", 4 => "Www.45it.net", 3 => "Banana", 4 => "ba le", 5 => "Www.45it.net", 6 => "www.45it.net"); $search _keys = Array_keys ($array 1, "www.45it.net"); foreach ($search _keys as $key) { unset ($array 1[$key]); } Print_r ($array 1); /* Get Results Array ([2] => pineapple [4] => [3] => banana) */ //Remove duplicate elements in array function functions Delmember (&A MP $array, $id) { $size = count ($array), for ($i = 0; $i < $size-$id-1; $i + +) { $array [$id + $i] = $array [$id + $i + 1]; } unset ($array [$size-1]); }