Remove last , in php string

Question

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.

_"I need to delete the last comma"_ - a) `rtrim` exists, and b) why did you _add_ it in the first place then? — CBroe, Jul 25 '22 at 08:39

Tim Biegeleisen · Accepted Answer · 2022-07-25T08:31:14.540

1

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

edited Jul 25 '22 at 08:31

answered Jul 25 '22 at 08:28

Tim Biegeleisen

502,043
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1

I was just about to answer the same using `implode`, when did it become `join`? :) – Ian Brindley Jul 25 '22 at 08:29
As you see I need to print the array in reverse. That's why I used the for loop – Kida Jul 25 '22 at 08:30
1

@Kida Missed that, sorry. Just use `join()` along with `array_reverse()`. Or, use a loop as I have done so in the second part of my answer. – Tim Biegeleisen Jul 25 '22 at 08:32
3

@IanBrindley [join](https://www.php.net/manual/de/function.join.php) is an alias of implode, implode still exists – brombeer Jul 25 '22 at 08:33
I can't believe this question still gets answered – Your Common Sense Jul 25 '22 at 09:44

score 0 · Answer 2 · answered Jul 25 '22 at 09:30

0

substring will work if you do operation after for loop

<?php

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

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

answered Jul 25 '22 at 09:30

Vipul Patil

1
1

score -3 · Answer 3 · answered Jul 25 '22 at 08:39

-3

$mystring='['I', 'II', 'III', 'IV', 'V']';
$myString = trim($myString, ',');
 echo $myString;

answered Jul 25 '22 at 08:39

Kezman10

3
3

`$mystring` is an invalid string that will cause a "parse error". `$myString` doesn't exist yet when using `trim`, you named it `$mystring`. `['I', 'II', 'III', 'IV', 'V']` should be an array, not a string. `trim` will _not_ remove the last comma here – brombeer Jul 25 '22 at 08:43

Remove last , in php string

3 Answers3