如何使用for循环获取逗号分隔值和最终值？

Question

PHP code:

$b = 1;
$ab = 100;

for ($b; $b < $ab; $b++)
{
    $len = strlen($b);
    $c = 0;
    for ($c; $c < $len; $c++)
    {
        $split = str_split($b);

        if ($split[$c] == 5)
        {
            echo $b . ',';
        }
    }
}

It's result is :

 5,15,25,35,45,50,51,52,53,54,55,55,56,57,58,59,65,75,85,95,

But I want remove the final comma and get the last value.

Answer 1

Changes done.

1. Defined $result=array();;

2. Stored values in an array $result[]= $b;

3. Imploded an array with , $result= implode(",", $result);

PHP code demo

<?php

$b = 1;
$ab = 100;
$result=array();

for ($b; $b < $ab; $b++)
{
    $len = strlen($b);
    $c = 0;
    for ($c; $c < $len; $c++)
    {
        $split = str_split($b);

        if ($split[$c] == 5)
        {
            $result[]= $b;
        }
    }
}
$lastElement =end($result);//last element
$result=  implode(",", $result);
print_r($result);