Randomly extracting elements from PHP arrays _php Tutorial

Random extraction of some elements of this function is very simple, as long as the use of Array_rand and range can be achieved, if the arbitrary extraction of an element directly using Mt_rand and then grow into a random number length does not exceed the length of the array.

Next I will give you a few ways for everyone to refer to.

Method-:

The code is as follows	Copy Code
$arr = range (1,10,1); $newarr = Array_rand ($arr, 6); Randomly get keys in 6 arrays $NEWARR = Array_flip ($newarr); Key and Value Interchange $arr 3 = Array_diff_key ($arr, $NEWARR); Take the same key $arr 1 = Array_diff_key ($arr, $arr 3); Take the same key Print_r ($arr 1);

Result: Array ([0] = 1 [1] = 2 [2] = 3 [3] = 4 [5] = 6 [9] = 10)

Method Two:

The code is as follows	Copy Code
$arr = range (1,10,1); $newarr = Array_rand ($arr, 6); Randomly get keys in 6 arrays $ArrNew = Array (); foreach ($newarr as $k = $v) { $ArrNew [$v] = $arr [$v]; } Print_r ($ARRNEW);

Result: Array ([1] = 2 [2] = 3 [3] = 4 [4] = 5 [6] = 7 [7] = 8)

Method Three: This method does not retain the key name, for everyone to refer to.

The code is as follows	Copy Code
$arr = range (1,10,1); Shuffle ($arr); Scrambled Array $newarr = Array_splice ($arr, 0,6); Print_r ($newarr);

Result: Array ([0] = 7 [1] = 4 [2] = 2 [3] = [4] = 9 [5] = 6)

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