从动态生成的字符串中删除最后一个字符

Question

I a trying to remove the last character in my string. I have seen many examples to do that but all the methods are removing my all '&' but i want only my last character '&' to be removed.

My string is :

https://website.biz/get/#TYPE#? partner_id=XXXXXXXX&api_password=XXXXXXXX&mobile_no=#NUMBER#&operator_code=#OPERATORID#&amount=#AMOUNT#&partner_request_id=#ORDERID#&circle=10&recharge_type=NORMAL&

The complete API is dynamic. I want to remove the last string '&' from this string. The above line is coming from my PHP code :

<td><?php $parameter = fetchAPIparameter($v6['api_id'],$v6['operator_type']);
    foreach ($parameter as $v7) {
       $pks = ($v7['parameter'].'='.$v7['result'].'&'); echo ($pks);
    } ?></td>

I have used substr($pks,0,-1) and substr_replace($pks,"",-1) and rtrim and mb_substr but all are removing the complete '&' from my API. Can you please help me what mistake i am doing.

Answer 1

You need to build a string in a variable then remove the last character.
The way you do it you remove the last character on each iteration which is not what you want.

<td><?php 
$parameter = fetchAPIparameter($v6['api_id'],$v6['operator_type']);
$pks = "";
foreach ($parameter as $v7) {
   $pks .= ($v7['parameter'].'='.$v7['result'].'&');  //here i am getting error
} 
echo substr($pks,0,-1);
?></td>

.= means it will append to the string.
substr will echo all but the last character.