How to implode 2 dimensional array into square brackets

Question

Hi guys,

I would like to output my php array into this format: [1991, 6.5], [1992, 4], [1993, 5.9]

PHP array:

while ($row = mysqli_fetch_array($result))
{
  $metals[] = array('year' => $row['year'], 
                    'metal' => $row['metal'];
}

I have seen some examples of implode function but I couldn't find any that could match what I want to do.

Thanks for your help.

Answer 1

Try

$tmp = array();
foreach($metals as $metal){
    $tmp[] = '['.implode(",", $metal).']';
}
$formatted_output = implode(",", $tmp);
print_r($formatted_output);

Answer 2

My crystal ball suggests you want to generate JSON for an AJAX thingie. If so, i's as easy as this:

<?php

$metals = array();
$metals[] = array(1991, 6.5);
$metals[] = array(1992, 4);
$metals[] = array(1993, 5.9);

echo json_encode($metals);

?>

Which prints:

[[1991,6.5],[1992,4],[1993,5.9]]