I want to store courseworks marks of n courseworks into n variables, such as cw1 and cw2 etc. Using variable variables how can I come with cw1, cw2 etc.
How can I dynamically create variables?
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6 Answers
Use an array instead:
An array in PHP is actually an ordered map. A map is a type that associates values to keys. This type is optimized for several different uses; it can be treated as an array, list (vector), hash table (an implementation of a map), dictionary, collection, stack, queue, and probably more. As array values can be other arrays, trees and multidimensional arrays are also possible...
2 Comments
Rich Bradshaw
Yep, you should be using an array here.
Rich Bradshaw
Came here to say this, then realised that I already did a few years ago!
You should really use an array, as Gumbo wrote:
$cw = array();
for($i = 0; $i < $n; ++$i) {
$cw[] = $something;
}
However, a solution to your problem:
for($i = 0; $i < $n; ++$i) {
$tmp = 'cw' . $i;
$$tmp = $something;
}
Comments
Not entirely sure I understand the question, but you can do something like this:
$VarName = 'cw1';
$$Varname = 'Mark Value';
If you have a large number of these, you may be better off using an array for them, with indexes based on the coursework.
ie:
$a = array();
$a['cw2'] = cw2value;
// etc.
Comments
<?php
//You can even add more Dollar Signs
$Bar = "a";
$Foo = "Bar";
$World = "Foo";
$Hello = "World";
$a = "Hello";
$a; //Returns Hello
$$a; //Returns World
$$$a; //Returns Foo
$$$$a; //Returns Bar
$$$$$a; //Returns a
$$$$$$a; //Returns Hello
$$$$$$$a; //Returns World
//... and so on ...//
?>
Comments
php > for ($i=0; $i<5; $i++)
{ ${"thing{$i}"} = $i; }
php > echo $thing1;
1
php > echo $thing2;
2
php > echo $thing3;
3
Note that we're using the dollar sign around curly braces around a string.
Comments
Variable variables work in this way
$var = "foo";
$$var = "bar";
echo $foo; // bar
But i do not recommend doing this, since what if the value of $var changes, then you can no longer print out the 3rd line in this code.
If you could elaborate more on what you want to do i think we could help you more.
