PHP - remove comma from the last loop

问题

I have a PHP while LOOP, and I want to remove last comma , from echo '],'; if it is last loop

            while($ltr = mysql_fetch_array($lt)){
                echo '[';
                echo $ltr['days']. ' ,'. $ltr['name'];
                echo '],';
            }

回答1:

$str = '';
while($ltr = mysql_fetch_array($lt)){
    $str .= '[';
    $str .= $ltr['days']. ' ,'. $ltr['name'];
    $str .= '],';
}

echo rtrim($str, ",");

this will remove the last , from string

回答2:

Create an array with the elements as you go along so that they look like array = ([ELEMENT INFO], [ELEMENT INFO], [ELEMENT INFO]) and then implode the array with a comma.

回答3:

I think the systemic solution is following:

$separator = '';
while($ltr = mysql_fetch_array($lt)){
    echo $separator;
    echo '[';
    echo $ltr['days']. ' ,'. $ltr['name'];
    echo ']';
    if (!$separator) $separator = ', ';
}

No call for count(), no additional iteration of implode(), no additional string operations, ready for any (unpredictable) number of results.

回答4:

$result = mysql_fetch_array($lt);
for ($i=0;$i<=(count($result)-1);$i++) {
    $ltr = $result[$i];
    echo '[';
    echo $ltr['days']. ' ,'. $ltr['name'];
    echo ']';
    if(!count($result)-1 == $i){
        echo ',';
    }
}

回答5:

Check how many entries you have, make a "Counter" and a condition to only put the comma when its not the last loop.

回答6:

$arr = array();
while($ltr = mysql_fetch_array($lt)){
    $arr[] = '[' . $ltr['days'] . ' ,' . $ltr['name'] . ']';
}

echo implode(',', $arr);

回答7:

$res_array = array();

while($ltr = mysql_fetch_array($lt)){
   $res_array[] = '['.$ltr['days']. ' ,'. $ltr['name'].']';
}

$str = implode(",",$res_array);
echo $str;

回答8:

Save the response as a var instead of echoing it and then remove the final character at the end using substr.

      $response = "";
       while($ltr = mysql_fetch_array($lt)){
            $response .= '[';
            $response .= $ltr['days']. ' ,'. $ltr['name'];
            $response .= '],';
        }
      echo substr($response, 0, -1);

回答9:

//this one works
$result = mysql_fetch_array($lt);
for ($i=0;$i<=(count($result)-1);$i++) {
    $ltr = $result[$i];
    echo '[';
    echo $ltr['days']. ' ,'. $ltr['name'];
    echo ']';
    if(count($result)-1 != $i){
        echo ',';
    }
}

来源：https://stackoverflow.com/questions/14701286/php-remove-comma-from-the-last-loop

标签

php

while-loop