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OhReally
Guest
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 Posted: Wed Feb 06, 2008 12:54 pm Post subject: Variable variables |
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Searching for a way to use variable variables with Smarty, I only found messages saying they are not supported. So I wrote a plugin to make them supported...
The site I'm developing includes tips. These tips can all have upto 5 links attached. They are called url_1, ..., url_5.
This is what my template looks like (some garbage removed for readability):
| Code: |
{get_tip tip=$tipid assign="tip"}
{section name="links" start=1 loop=6}
{varvar var="tip.url_`$smarty.section.links.index`"}<br />
{/section}
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This is the file function.varvar.php in my plugins dir:
| Code: |
<?php
function smarty_function_varvar($args, &$smarty) {
if (empty($args["var"])) {
return;
}
$array = explode(".", $args["var"]);
$var = array_shift($array);
$val = $smarty->get_template_vars($var);
if (count($array) == 0) {
return $val;
}
else {
$idx = "['" . join("']['", $array) . "']";
eval("\$return = \$val$idx;");
return $return;
}
}
?>
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Of course, if you don't use arrays, function.varvar.php could be reduced to:
| Code: |
function smarty_function_varvar($args, &$smarty) {
return $smarty->get_template_vars($args["var"]);
}
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It may not be the prettiest solution, and it's definitely more code than '$$', but it works.
Thought I'd share it.
Edit: I've added this plugin to the SmartyWiki.
Last edited by OhReally on Thu Feb 07, 2008 5:35 pm; edited 1 time in total |
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Celeb
Administrator
Joined: 17 Apr 2007
Posts: 1025
Location: Vienna
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| Posted: Wed Feb 06, 2008 1:18 pm Post subject: |
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Thanks for sharing 
Why don't you use an array to store the links instead of multiple variables?
_________________
Darn computers always do what I tell them to instead of what I want them to do. |
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OhReally
Guest
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| Posted: Wed Feb 06, 2008 4:07 pm Post subject: Just to prove a point... ;) |
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| Celeb wrote: | | Why don't you use an array to store the links instead of multiple variables? |
Because MySQL doesn't support arrays, and I assign $tip like
| Code: |
$result = $db->query("select ...");
$tip = $result->fetch_assoc();
$smarty->assign("tip", $tip);
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I could, of course, do things to $tip before I assign it, but that would be a choice between PHP and PHP...
And when over 800 Google hits tell me Smarty doesn't support variable variables, I want to prove it does...  |
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U.Tews
Administrator
Joined: 22 Nov 2006
Posts: 5068
Location: Hamburg / Germany
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| Posted: Wed Feb 06, 2008 9:18 pm Post subject: |
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I have written a small modifier to do the job.
File modifier.varvar.php
| Code: | <?php
function smarty_modifier_varvar($string)
{
global $smarty;
return $smarty->_tpl_vars[$string];
}
?> |
Template
| Code: |
{assign var="ourTest" value="whoo"}
{assign var="our" value="our"}
{assign var="test" value="Test"}
{assign var="finally" value="$our$test"|varvar}
Each of the following will output "whoo"
{$finally}
{"$our$test"|varvar}
{"our$test"|varvar}
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OhReally
Guest
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| Posted: Fri Feb 08, 2008 6:41 pm Post subject: |
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When I was writing this function, I was wondering whether it should be a function or a modifier...
Can someone tell me which would be the preferred way? The only real difference I see, is that the modifier needs to declare $smarty global, where the function doesn't because it's passed by reference.
Is there a difference in cost? |
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U.Tews
Administrator
Joined: 22 Nov 2006
Posts: 5068
Location: Hamburg / Germany
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| Posted: Fri Feb 08, 2008 6:58 pm Post subject: |
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Modifiers can be used almost anywhere in the template. I don't think that you can use a function at parameters of other Smarty tags. Also you have to pass parameters to the function in a little bit more complicated way.
So I think in this case a modifier is more flexible and easier to use. |
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Gaskonijn
Smarty Rookie
Joined: 03 Mar 2008
Posts: 6
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| Posted: Mon Mar 03, 2008 8:50 am Post subject: |
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Does anyone now how i use it with arrays? So i hava a variable $waarden where all my values of my submited form are in. So when a user is posted back i want to show him all the variables he posted. so in a textfield I do value="{"$waarden.input_$ids[klantviewfilters]"}" wich gives me Array.input_2 But how do i give the value of that field? 
some more info: $ids is an array i give in my php script with all the id's of the generated fields. klantviewfilters is a section so that gives the current one in the array. The output i want is the variable $waarden.input_2 wich the value test is stored in. But the clossest i can get is Array.input_2  |
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OhReally
Guest
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| Posted: Mon Mar 03, 2008 9:18 am Post subject: |
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If you drop the first dollar sign, it should work. Also, drop the square brackets, and put a dot between '$ids' and 'klantviewfilters; square brackets are not supported (yet). So:
| Code: | | value="{"waarden.input_$ids.klantviewfilters"|varvar}" |
if you use the modifier (the preferred way), or
| Code: | | value="{varvar var="waarden.input_$ids.klantviewfilters"}" |
if you use the function. |
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Gaskonijn
Smarty Rookie
Joined: 03 Mar 2008
Posts: 6
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| Posted: Mon Mar 03, 2008 9:27 am Post subject: |
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Still doesn't work  and i did a print_r and got Array ( [input_2] => test ) so there is a value at that place :s
so i have the modifier modifier.varvar.php in my plugins directory with in there the code:
| Code: |
function smarty_modifier_varvar($string)
{
global $smarty;
return $smarty->_tpl_vars[$string];
}
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and in my tpl file i have
| Code: | | value="{"waarden.input_$ids.klantviewfilters"|varvar}" |
is this all i need? or am i missing something :s sorry for the noob questions but it's the first time i use smarty for a large project |
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OhReally
Guest
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| Posted: Mon Mar 03, 2008 9:33 am Post subject: |
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| U.Tews' modifier doesn't support arrays. Save this code as modifier.varvar.php in your plugins directory. |
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Gaskonijn
Smarty Rookie
Joined: 03 Mar 2008
Posts: 6
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| Posted: Mon Mar 03, 2008 9:40 am Post subject: |
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| OhReally wrote: | | U.Tews' modifier doesn't support arrays. Save this code as modifier.varvar.php in your plugins directory. |
I copied that code but get the error:
| Code: | | Fatal error: Call to a member function get_template_vars() on a non-object |
So he is not seeing $smarty as an object :s
I thnk the reason he doesn't find smarty is beacause i'm extending smarty from every page and not using it as an object. Is there any way around so i could use this function? |
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OhReally
Guest
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| Posted: Mon Mar 03, 2008 10:07 am Post subject: |
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| I guess you mean you have an object that extends the Smarty object. If that's true, then this should work if you replace '$smarty' in the modifier code with the name you gave your object. |
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Gaskonijn
Smarty Rookie
Joined: 03 Mar 2008
Posts: 6
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| Posted: Mon Mar 03, 2008 10:18 am Post subject: |
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Hmmm did that but still doesn't work I get no output at all
Just editing the modifier and echo'ing $idx and i get as a result ['input_Array']['klantviewfilters'] wicht is not correct i think the actual vallue of $return is Array['input_Array']['klantviewfilters'] Shouldn't that be Array['input_Array['klantviewfilters']]; ? so it replaces the Array['klantviewfilters'] with the number stored in there and the result of Array['input_2'] is retrieved? |
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OhReally
Guest
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| Posted: Mon Mar 03, 2008 10:44 am Post subject: |
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I don't know. I don't know your code, so I don't know what values you expect...
But you've lost me with the classes extending classes extending classes anyway, so I don't think I can help you any further  .
I guess you'll have to write your own modifier. Take my code as an example, and try to understand what it does: it takes a string and uses that as the name of a template variable to return, nothing more, nothing less.
Good luck! |
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Gaskonijn
Smarty Rookie
Joined: 03 Mar 2008
Posts: 6
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| Posted: Mon Mar 03, 2008 10:48 am Post subject: |
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thx for the help so far. Will try to hack in it some more and get the results i want  |
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