Variable inside curly brackets - php

Question

I know how to execute php variable inside quotes
$q1 = 1;
$q2 = 2;
$q3 = 3;
$q4 = 4;
$q5 = 5;
echo "${q1}"; //outputs 1
How can i output them in a loop?
for($i=1; $i<=5; $i++)
{
echo "${q$i}"; //how to make $i work here?
}
How to make $i work along with $q?
UPDATE
i want the quotes to be there, because i am creating a string in a loop and i want to pass that loop to mysql query. So i want the string to be like
$str = '$q1, $q2, $q3';
and when i pass it to mysql query it should interpret the values of $q1, $q2, $q3 which is 1,2,3
mysql_query("INSERT INTO users (col1, col2, col3) VALUES ($str)");
So it should become
mysql_query("INSERT INTO users (col1, col2, col3) VALUES (1,2,3)");
It is just an example i know the syntax of mysql_query is wrong but you know

Answer 1

I think what you are looking for is this:
<?php
$arr = array();
$q1 = 1;
$q2 = 2;
$q3 = 3;
$q4 = 4;
$q5 = 5;
for($i=1; $i<=5; $i++)
{
$arr[] = ${"q".$i};
}
$str = implode($arr, ',');
print_r($str);
Outputs:
1,2,3,4,5
In action: http://codepad.org/ep7sraT5

Answer 2

for($i=1; $i<=5; $i++)
{
$x = "q$i";
echo $$x;
}
works!

Answer 3

Use this code, it should work :)
echo ${"q${i}"};

Answer 4

The double quotes around the whole thing are useless
use
echo ${'q' . $i};
EDIT: If you want to create the comma seperated string, why not try
$q1 = 1;
$q2 = 2;
$q3 = 3;
$q4 = 4;
$q5 = 5;
$parts = array();
for($i=1; $i<=5; $i++)
{
$parts[] = ${'q' . $i};
}
$str = implode(', ', $parts);
Also consider escaping the values before running the MYSQL, you could do this within the for loop before adding the value to the $parts array

Answer 5

for($i=1; $i<=5; $i++)
{
echo ${"q".$i};
}
Output:
12345
Codepad: http://codepad.org/2PIshh41
UPDATE:
Since you wanted to store the value in varible, you can do this:
$str = '';
for($i=1; $i<=5; $i++)
{
$str .= "${"q".$i}, ";
}
$str = rtrim($str, ' ,'); //trim last comma
mysql_query("INSERT INTO users (col1, col2, col3) VALUES ($str)");
//becomes mysql_query("INSERT INTO users (col1, col2, col3) VALUES (1, 2, 3, 4, 5)")
Hope this helps!