PHP：如何在for循环中删除逗号？

  <?php 
    for ($i = 10; $i < 101; $i = $i + 10) {
    echo $i;        
    }   
  ?>

I'm starting to learn PHP and this is the code I'm working on. What I'm trying to do is remove the comma on the last item that will display (e.g. 10, 20, 30, 40, 50, 60, 70, 80, 90, 100,) I've searched the forum and all I see are methods for "foreach"...Any suggestions, replies are appreciated.

There is no comma in your code or it's output but your question is still understandable and you just missed posting the code line which outputs those commas. You simply have to check if this is the last iteration of the loop and if so don't print comma

echo $i;
if($i<100)    //currently you don't have this check so you get an extra comma
 echo ",";

Output

10,20,30,40,50,60,70,80,90,100

Try this:

$result = array();

for ($i = 10; $i < 101; $i += 10) {
    $result[] = $i;
}

echo implode(", ", $result);

You could do something like this,

$result = array();
for ( $i = 10; $i < 101; $i = $i + 10 ){
    $result[] = $i;
}
echo implode(", ", $result);

This should work!

If it's an array, write implode(',', $array). If it's not, save output from each iteration to a variable(say $output), then, write substr($output,0,-1).

$output = "";
for ($i = 10; $i < 101; $i = $i + 10) {
 $output .= $i.",";        
}   
echo substr($output,0,-1);

Your code doesn't relate to your question/description, though!