PHP How to split a one dimensional array in two dimensional

Question

I have a one dimensional array which looks like this:

$table = array("rnbqkbnr", 
               "pppppppp", 
               "00000000", 
               "00000000",
               "00000000", 
               "00000000", 
               "00000000", 
               "PPPPPPPP", 
               "RNBQKBNR" );

What I want to do is make that array a two dimensional, each element to be an array on it's own, so I can access every letter.

Something like this:

$arr= array(
    array("r", "n", "b", "q", "k", "b", "n", "r"),
    array("p", "p", "p", "p", "p", "p", "p", "p"),
    array("0", "0", "0", "0", "0", "0", "0", "0"),
    array("0", "0", "0", "0", "0", "0", "0", "0"),        
    array("0", "0", "0", "0", "0", "0", "0", "0"),        
    array("0", "0", "0", "0", "0", "0", "0", "0"),
    array("P", "P", "P", "P", "P", "P", "P", "P"),
    array("R", "N", "B", "Q", "K", "B", "N", "R")
);

I tried different finctions like str_split(), or array_chunk(), or explode(), but everytime I end up getting the first function ($table) which is one dimensional and I can't acces every element separately.

Every help is appreciated :)

6be709c0 · Accepted Answer · 2016-04-18 16:42:08Z

4

You can already access every letter.

A string is series of characters (Php Doc)

This work's fine.

print_r($table[0][0]); // return r

answered Apr 18, 2016 at 16:42

6be709c0

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Comments

Jeff Lambert · Accepted Answer · 2016-04-18 16:59:19Z

3

You can use array_map coupled with str_split to arrive at a pretty easy solution to this:

<?php

$table = array(
   "rnbqkbnr", 
   "pppppppp", 
   "00000000", 
   "00000000",
   "00000000", 
   "00000000", 
   "00000000", 
   "PPPPPPPP", 
   "RNBQKBNR" 
);


$table = array_map('str_split', $table); // thanks @RolandStarke

var_dump($table);

edited Apr 18, 2016 at 16:59

answered Apr 18, 2016 at 16:52

Jeff Lambert

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Comments

Chin Leung · Accepted Answer · 2016-04-18 16:42:44Z

1

You can loop through each of the array in your outer array:

for($i=0; $i<count($table); $i++){
    $table[$i] = str_split($table[$i]);
}

answered Apr 18, 2016 at 16:42

Chin Leung

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Comments

George Pant · Accepted Answer · 2016-04-18 16:55:43Z

1

Just use str_split inside a foreach loop

foreach($table as $key=>$line)
{
 $table[$key]=str_split($line);
}

answered Apr 18, 2016 at 16:55

George Pant

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6be709c0 · Accepted Answer · 2016-04-18 16:48:03Z

0

You can do as following. Just split each string to characters.

$table = array("rnbqkbnr",
    "pppppppp",
    "00000000",
    "00000000",
    "00000000",
    "00000000",
    "00000000",
    "PPPPPPPP",
    "RNBQKBNR");

$newArray = array();
foreach ($table as $t) {
    $newArray[] = str_split($t);
}

edited Apr 18, 2016 at 16:48

6be709c0

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answered Apr 18, 2016 at 16:42

Imesha Sudasingha

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Comments

Axel Guilmin · Accepted Answer · 2016-04-18 17:07:22Z

0

This code should help fix your problem up. Also, it should work for various array sizes.

$table = array("rnbqkbnr",
    "pppppppp",
    "00000000",
    "00000000",
    "00000000",
    "00000000",
    "00000000",
    "PPPPPPPP",
    "RNBQKBNR");

for ($i = 0; $i != count($table); ++$i) {
    if (isset($subArray)) {
        unset($subArray);
    }

    for ($j = 0; $j != strlen($table[$i]); ++$j) {
        $subArray[] = substr($table[$i], $j, 1);
    }

    $twoDimensionalArray[] = $subArray;
}

print_r($twoDimensionalArray);

edited Apr 18, 2016 at 17:07

Axel Guilmin

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answered Apr 18, 2016 at 16:43

RefreshCarts

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Comments

MonkeyZeus · Accepted Answer · 2016-04-18 18:14:11Z

0

Not sure what you've tried but this should work:

foreach($table as $v)
{
    $arr[] = str_split($v);
}
unset($v);

edited Apr 18, 2016 at 18:14

answered Apr 18, 2016 at 16:41

MonkeyZeus

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3 Comments

Jonathan Kuhn Over a year ago

why would you be looping with $v as a reference when not even using the reference? Just seems to me to be an unnecessary risk waiting to happen if you forget the unset. You could also just do $v = ... and it will overwrite the original value in the array.

Mike Over a year ago

Passing by reference is faster? Even if that's true, this isn't going to be the bottleneck in the program. It's better to code for readability instead of micro-optimizing like that. Passing something by reference and then not using it makes the code less readable IMO.

Jonathan Kuhn Over a year ago

I show passing by reference is pretty much the same all over. 3v4l.org/Z4Asq, both trading spaces as to which was faster.

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