PHP - print multidimensional array

Question

I'm having a brain-block with this piece of code. I want to print a multidimensional array in PHP where the 'columns' are separated by hyphens and the 'rows' are separated by newlines.

My problem is that my code prints a '-' at the end of each row. This is obvious when looking at my code:

N.B. ($result is a 2D array i.e. $result[][])

foreach($result as $row){
    foreach($row as $column){
            echo $column . "-";
    }
    echo "\n";
}

This is the output:

42-1-1394752507-16.125-
43-1-1394752569-16.125-
44-1-1394752632-16.562-
45-1-1394752693-17.125-

What is the best way to print this out to avoid the trailing - on each row? I could do a check to see if the current $column is the last element in the $row but I don't actually know how to do this

AbraCadaver · Accepted Answer · 2014-03-20 20:26:02Z

7

implode is your friend:

foreach($result as $row){
    echo implode('-', $row) . "\n";
}

answered Mar 20, 2014 at 20:26

AbraCadaver

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2 Comments

nagyben Over a year ago

This worked perfectly, and is even simpler than what I thought I needed to do. Thanks! Will accept in 5 mins when it lets me

AbraCadaver Over a year ago

@exantas: I always look for a built-in function, especially to not loop :-)

keelerm · Accepted Answer · 2014-03-20 20:27:16Z

1

<?php

$row = [
    '42' => [1, 2, 3],
    '43' => [2, 3, 4],
];

array_walk($row, function($item, $key) {
    echo $key . implode('-', $item) . PHP_EOL;
});

answered Mar 20, 2014 at 20:27

keelerm

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Comments

thelolcat · Accepted Answer · 2014-03-20 20:39:01Z

1

I could do a check to see if the current $column is the last element in the $row but I don't actually know how to do this

implode() is the way to go, but if you want to understand how to find out if the current column is the last one:

// foreach (value)
foreach($result as $row){
  $column_count = count($row);

  // for each (key => value)
  foreach($row as $column_index => $column){
    echo $column;

    if($column_index < $column_count - 1){
      echo "-";
  }
  echo "\n";
}

answered Mar 20, 2014 at 20:39

thelolcat

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1 Comment

nagyben Over a year ago

I liked this answer as well. Thanks for the info

Spoody · Accepted Answer · 2018-02-01 23:33:46Z

1

Instead of the inner foreach you could just use implode:

implode($row,"-");

edited Feb 1, 2018 at 23:33

Spoody

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answered Mar 20, 2014 at 20:26

Johann Bauer

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4 Comments

AbraCadaver Over a year ago

You don't want to implode the $column it's not an array. And your args are backwards.

gen_Eric Over a year ago

@AbraCadaver: For "historical reasons", you can swap the order of parameters. From the docs:

implode() can, for historical reasons, accept its parameters in either order. For consistency with explode(), however, it may be less confusing to use the documented order of arguments.

php.net/implode

AbraCadaver Over a year ago

@RocketHazmat: Doh, its been so long since I looked at the implode manual, but that memory smacks me in the head now.

Johann Bauer Over a year ago

@AbraCadaver: Of course you are right. I edited my answer according the first parameter. PHP.net also states that this order of the arguments should not be used

user557846 · Accepted Answer · 2014-03-20 20:26:22Z

0

one option:

foreach($result as $row){
$c='';
    foreach($row as $column){
            $c.= $column . "-";
    }
    $c=rtrim($c,'-');
    echo "$c\n";
}

answered Mar 20, 2014 at 20:26

user557846

Comments

maosmurf · Accepted Answer · 2014-03-20 20:38:09Z

0

if you also want to avoid a trailing newline, you could use this one-liner:

echo implode(array_map(function($row) {return implode('-', $row);}, $result), "\n");

of course, oneliners are ugly and not clean code.

what does this code do? it uses implode on each row, and array_map creates a flat (1-dimensional) array of already imploded rows. that is again imploded with newline.

finally, this solution is not the most performant one. but it's a neat oneliner :)

answered Mar 20, 2014 at 20:38

maosmurf

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1 Comment

thelolcat Over a year ago

that is not a one liner. the rules say that a one-liner cannot exceed 3 function calls

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