Remove last , in php string

July 25, 2022

Hello I have this example

I need to delete the last comma

<?php

$numeri = ['I', 'II', 'III', 'IV', 'V'];

$size = count($numeri);
for ($i = $size - 1; $i >= 0; $i--) {
    $a = $numeri[$i]  . ',';
    echo $a;
 
}


?>

V, IV, III , II, I,

But even if I use substr or substrl_replace it deletes all the commas.

>Solution :

You may use the join() function here:

$numeri = ['I', 'II', 'III', 'IV', 'V'];
$output = join(",", array_reverse($numeri));
echo $output;  // V,IV,III,II,I

If you want to stick with a loop approach, then use logic to prepend a comma at each iteration, except for the very first:

$numeri = ['I', 'II', 'III', 'IV', 'V'];

$size = count($numeri);
$a = null;
for ($i = $size - 1; $i >= 0; $i--) {
    if ($a) $a .= ",";
    $a .= $numeri[$i];
}

echo $a;  // V,IV,III,II,I