Randomly extract some elements from the PHP array _ PHP Tutorial-php Tutorial

Randomly extract some elements from the PHP array. The method to randomly extract some elements is simple. you only need to use array_rand and range to implement this function, if you just extract an element, you can directly use mt_rand and then grow into a random number to randomly extract some elements. This function is easy to implement, as long as you use array_rand and range, if you just extract an element, you can directly use mt_rand and then grow into a random number length that does not exceed the length of the array.

Below I will provide you with several methods for your reference.

Method -:

The code is as follows:
$ Arr = range (1, 10, 1 ); $ Newarr = array_rand ($ arr, 6); // Obtain the keys in the six arrays at random. $ NewArr = array_flip ($ newarr); // key-value interchange $ Arr3 = array_diff_key ($ arr, $ newArr); // obtain the same key $ Arr1 = array_diff_key ($ arr, $ arr3); // obtain the same key Print_r ($ arr1 );

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

Method 2:

The code is as follows:
$ Arr = range (1, 10, 1 ); $ Newarr = array_rand ($ arr, 6); // Obtain the keys in the six arrays at random. $ 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 3: This method does not retain the key name for your reference.

The code is as follows:
$ Arr = range (1, 10, 1 ); Shuffle ($ arr); // disrupt the array $ Newarr = array_splice ($ arr, 0, 6 ); Print_r ($ newarr );

Result: array ([0] => 7 [1] => 4 [2] => 2 [3] => 10 [4] => 9 [5] => 6)

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