I have array like this.
A=array();
A[0]=>name = "John";
A[0]=>lastname = "Blabla";
A[0]=>genre = "Male";
A[1]=>name = "Cheryl";
A[1]=>lastname = "Blabla";
A[1]=>genre = "Female";
I want to shuffle this array with preserving key-value pairs and without mixing every key. So basicly A[0] will be A[1](there are more than only 2 index just example it should be random) with all of child keys values etc.
How can i do this? Thanks
You can loop through the array and then randomly exchange the values in it.
for($x=0;$x<count($array);$x++){
$temp=$array[$x];
$index=rand(0,count($array)-1);
$array[x]=$array[$index];
$array[$index]=$temp;
}
Working example below.
<?php
$array=array();
$array[0]['name'] = "John";
$array[0]['lastname'] = "Blabla";
$array[0]['genre'] = "Male";
$array[1]['name'] = "Cheryl";
$array[1]['lastname'] = "Blabla";
$array[1]['genre'] = "Female";
$array[2]['name'] = "Amy";
$array[2]['lastname'] = "Blabla";
$array[2]['genre'] = "Female";
$array[3]['name'] = "Adam";
$array[3]['lastname'] = "Blabla";
$array[3]['genre'] = "Female";
$array[4]['name'] = "Hitan";
$array[4]['lastname'] = "Blabla";
$array[4]['genre'] = "Male";
$array[5]['name'] = "Mary";
$array[5]['lastname'] = "Blabla";
$array[5]['genre'] = "Female";
for($x=0;$x<count($array);$x++){
$temp=$array[$x];
$index=rand(0,count($array)-1);
$array[$x]=$array[$index];
$array[$index]=$temp;
}
var_dump($array);
shuffle($array)? As I can see it just N random swaps? May be I just can't to understand original issue.
Just randomize the index of the array, no need to care about the specific field of object stored as array element.
public function randomObj(A)
{
$index = rand(0, 1);
return A[$index];
}
Add here as an extra explanation: shuffle means you swap certain amount of objects(which change the index of the object as an element in the array), while randomize means you get an object randomly(no need to change the index of object, but when you want to get one, it returns a random object).
This function returns same array with shuffled iteration order:
function kshuffle($a) {
$k = array_keys($a);
shuffle($k);
$res = [];
foreach($k as $index) $res[$index] = $a[$index];
return $res;
}
print_r(kshuffle(['a', 'b', 'c', 'd', 'e', 'f', 'g']));
Array
(
[4] => e
[1] => b
[3] => d
[0] => a
[6] => g
[5] => f
[2] => c
)
So, it will produce shuffled sequence, while we iterate result with foreach.
It also will generate hashtable/object if you want to json_encode result: {"1": "b", "0": "a"}. But be careful, if random returns unshuffled sequence(there is always probability for this event) it will plain array: ['a', 'b'] without JSON_FORCE_OBJECT flag.