[SOLVED] Split Array

[Doyley]

Hi all,

 

I have an array of numbers which will always have an even number of keys.  I would like to split this array in two so there are two arrays with exactly the same number of keys.  The closest function I can find is array_slice which I'm not sure how to use correctly.  Does anybody have their own function that they could share?

 

Many thanks!

[rajivgonsalves]

here you go with some logic applied

 

$array = array(1,2,3,4);

list($array1,$array2) = array(array_slice($array,0,floor(count($array)/2)),array_slice($array,floor(count($array)/2),count($array)));
print_r($array1);
print_r($array2);

[Doyley]

Worked like a charm, thanks very much.

 

One more question if you don't mind.  I need to make sure that the positions of the keys in the arrays are different.  For example I have 2 arrays now...

 

Array

(

    [0] => 2

    [1] => 21

    [2] => 4

    [3] => 23

    [4] => 29

    [5] => 12

    [6] => 15

    [7] => Bye

)

 

Array

(

    [0] => Bye

    [1] => Bye

    [2] => Bye

    [3] => 22

    [4] => 1

    [5] => 11

    [6] => 14

    [7] => Bye

)

 

Key 7 on both of these arrays are both "Bye".  If this is the case I need to make sure that it is shuffled or something similar to make sue there are never two "Byes" in the same key.  Do you have any ideas?

 

Thanks again!

[ToonMariner]

array_diff(), array_intersect()....

[Barand]

try

<?php
$arr1 = array (1,'bye',3,4,5,6,'bye');
$arr2 = array (11,12,'bye',14,15,16,'bye');

$k1 = array_keys($arr1, 'bye');
$k2 = array_keys($arr2, 'bye');
$k3 = array_intersect($k1,$k2);
while ($k3 ) {
     shuffle($arr1);
     $k1 = array_keys($arr1, 'bye');
     $k3 = array_intersect($k1,$k2);
}

echo '<pre>A1 ', print_r($arr1, true), '</pre>';
echo '<pre>A2 ', print_r($arr2, true), '</pre>';

?>

[Doyley]

Thanks for your help guys.  Barand, I managed to write my own before I notice you replied but thanks anyway...

 

If anybody is interested, here is the code.  It seems to work pretty well.

 

function splitArray($runners){

shuffle($runners);

$array=$runners;

list($array1,$array2) = array(array_slice($array,0,floor(count($array)/2)),array_slice($array,floor(count($array)/2),count($array)));

$result[]=$array1;
$result[]=$array2;

return $result;
}

function checkNoDupe($result){

$array1=$result[0];
$array2=$result[1];

for($x=0;$x<=count($array1)-1;$x++){

if($array1[$x]==$array2[$x]){

return true;
}
}
}

function runIt($runners){

global $numbyes, $num;

$result=splitArray($runners);

if($numbyes<=$num){

while(checkNoDupe($result)){

$result=splitArray($runners);
}
}

return $result;
}

$result=runIt($runners);