How do I split a string into a two dimensional array without loops?
My string is in the format "A,5|B,3|C,8"
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1Just out of curiosity, why do you want to do it without loops?Anti Veeranna– Anti Veeranna2009-12-22 18:41:02 +00:00Commented Dec 22, 2009 at 18:41
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6 Answers
Without you actually doing the looping part, something based on array_map + explode should do the trick ; for instance, considering you are using PHP 5.3 :
$str = "A,5|B,3|C,8";
$a = array_map(
function ($substr) {
return explode(',', $substr);
},
explode('|', $str)
);
var_dump($a);
Will get you :
array
0 =>
array
0 => string 'A' (length=1)
1 => string '5' (length=1)
1 =>
array
0 => string 'B' (length=1)
1 => string '3' (length=1)
2 =>
array
0 => string 'C' (length=1)
1 => string '8' (length=1)
Of course, this portion of code could be re-written to not use a lambda-function, and work with PHP < 5.3 -- but not as fun ^^
Still, I presume array_map will loop over each element of the array returned by explode... So, even if the loop is not in your code, there will still be one...
Comments
Without loops at all? Can't be done. Without you having to write the loop? Explode or one of the regex "split" methods.
1 Comment
Gavin H
Unless of course the multidimensional arrays are always of the same size, but thats not usually a good assumption....
preg_match_all("~([^|,]+),([^|,]+)~", $str, $m);
$result = array_combine($m[1], $m[2]);
this returns an array like array('A' => 5, 'B' => 3 etc
Comments
Depending on whether array_walk() counts as a loop...
<?php
class Splitter {
function __construct($text){
$this->items = array();
array_walk(explode('|', $text), array($this, 'split'));
}
function split($input){
$this->items[] = explode(',', $input);
}
}
$s = new Splitter("A,5|B,3|C,8");
print_r($s->items);
Comments
So long as you know how many items will be in each row, you can declare one or more capture groups in a single lookahead.
This is "not a loop", or at least it is not a loop like foreach() or array_map(). Demo
$str = "A,5|B,3|C,8";
preg_match_all(
'/[^,|]+(?=,([^|]+))/',
$str,
$m,
PREG_SET_ORDER
);
var_export($m);
Output:
array (
0 =>
array (
0 => 'A',
1 => '5',
),
1 =>
array (
0 => 'B',
1 => '3',
),
2 =>
array (
0 => 'C',
1 => '8',
),
)
Comments
If your data is huge this could get heavy but here's one solution:
<?php
$data = "A,5|B,3|C,8";
$search = array("|",",");
$replace = array("&","=");
$array = parse_str(str_replace($search, $replace, $data));
?>
Would result into something like this:
$array = array(
A => 5,
B => 3,
C => 8,
);
2 Comments
mickmackusa
Your assumed output is not a multidimensional array.