Generate 2 arrays from an array

Question

i have an array like this, with x-coordinate and y-coordinate forming an individual entry.

$polygon = array("10 0", "20 5", "15 15", "22 15");

Now how can i break this array into 2 different arrays, such that all x-coordinates will fall into one array and all y-coordinates will fall into another array, like this:

$x = array(10, 20, 15, 22);
$y = array(0, 5, 15, 15);

gnur · Accepted Answer · 2011-02-28 09:49:43Z

5

$x = $y = array();
$polygon = array("10 0", "20 5", "15 15", "22 15");
foreach ($polygon as $coor) {
    list($x[], $y[]) = explode(' ', $coor);
}

This will do the trick :)

And to combine them back:

//assuming that $x and $y have the same number of items
for ($i = 0; $i<count($x); $i++) {
    $polygon[] = $x[$i] .' ' . $y[$i];
}

edited Feb 28, 2011 at 9:49

answered Feb 28, 2011 at 9:34

gnur

4,7412 gold badges22 silver badges33 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

edorian Over a year ago

Nice use of list() there, didn't know that was possible

shasi kanth Over a year ago

Thanks for the answer, just curious to know, how to do the reverse of it? I mean, if i have the $x and $y arrays, how to generate $polygon array?

xvga · Accepted Answer · 2011-02-28 09:40:23Z

1

Try that:

$x = array();
$y = array();
foreach($polygon as $entry){
 $splitted = explode(" ", $entry);
 //append x and y 
 $x[] = $splitted[0];
 $y[] = $splitted[1];
}

answered Feb 28, 2011 at 9:40

xvga

6011 gold badge10 silver badges15 bronze badges

Collectives™ on Stack Overflow

Generate 2 arrays from an array

2 Answers 2

2 Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

2 Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related