是否可以使用$ i在for循环中定义PHP变量？

I am looking to do something like the following:

for ($i=0; $i<=$number_of_bundles; $i++) {

    $rug_size . $i = $_POST['Size' . $i];

}

Unfortunately this does not work since I get "undefined index" and when I try echoeing, for example, $rug_size1 is undefined.

How can something like this be done?

Assuming you initialize $rug_size as an array():

$rug_size[$i] = $_POST['Size' . $i];

If you really want to use different variable names (hopefully not):

$vn = 'rug_size' . $i;
$$vn = $_POST['Size' . $i];

if i am not wrong than

$_POST['Size' , $i]

will be(i.e. dot instead of comma)

$_POST['Size'. $i]

another way to avoid error:use isset()

for ($i=0; $i<=$number_of_bundles; $i++) {
if(isset($_POST['Size' . $i]))
 {
  $rug_size . $i = $_POST['Size' . $i];
 }
}

You need wrap you dynamic variable within {} (and concat string with Dot), like:

<?php
$i = 1;
${"rug_size".$i} = "Hello world!";
echo $rug_size1;
?>

Output:

Hello world!

schould work like this:

for ($i=0; $i<=$number_of_bundles; $i++) {
    $varname = 'rug_size'.$i;
    $$varname = $_POST['Size'.$i];
}

http://php.net/manual/en/language.variables.variable.php

do like this .

for ($i=0; $i<=$number_of_bundles; $i++) {

    ${'rug_size' . $i} = $_POST['Size' . $i];
}