Resolving {$var} from within a string...

[Chris Jones]

If i use

<?
$x = 4 ;
echo "This is the value of x: {$x}" ;
?>

i will obviously get the output
This is the value of x: 4

But when i have a string, in an SQL varchar field, such as
kra.php?EID={$e id}

I can then do $href = db_query($qry,0 ,"href") to get the SQL data into
$href, but when i echo $href, the $eid comes out as plain-text and
doesn't resolve to the current value of $eid.

Is it possible to force PHP to attempt to resolve any embedded $vars
within a string?
i.e. so when i output $href, i get
kra.php?EID=1

Thanks

[Toby A Inkster]

Re: Resolving {$var} from within a string...

Chris Jones wrote:

Is it possible to force PHP to attempt to resolve any embedded $vars
within a string?

No.

But look at sprintf().

--
Toby A Inkster BSc (Hons) ARCS
Contact Me ~ http://tobyinkster.co.uk/contact
Geek of ~ HTML/SQL/Perl/PHP/Python*/Apache/Linux

* = I'm getting there!

[Kimmo Laine]

Re: Resolving {$var} from within a string...

"Toby A Inkster" <usenet200703@t obyinkster.co.u kwrote in message
news:p72cf4-4kp.ln1@ophelia .g5n.co.uk...

Chris Jones wrote:
>

>Is it possible to force PHP to attempt to resolve any embedded $vars
>within a string?

>
No.

Wrong. It is possible with eval(), but it's strongly advaised not to use
this approach:

http://fi2.php.net/manual/en/function.eval.php

--
"Ohjelmoija on organismi joka muuttaa kofeiinia koodiksi" - lpk
http://outolempi.net/ahdistus/ - Satunnaisesti päivittyvä nettisarjis
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[Chris Jones]

Re: Resolving {$var} from within a string...

On 16 Apr, 13:24, "Kimmo Laine" <s...@outolempi .netwrote:

"Toby A Inkster" <usenet200...@t obyinkster.co.u kwrote in messagenews:p72 cf4-4kp.ln1@ophelia .g5n.co.uk...
>

Chris Jones wrote:

Cracked it.... the easiest way surely is just

$eid = $_GET['EID'];
$href = str_replace("{$ eid}","{$eid}", db_result($qry, 0,"href");

:-)

>

Is it possible to force PHP to attempt to resolve any embedded $vars
within a string?

>

No.

>
Wrong. It is possible with eval(), but it's strongly advaised not to use
this approach:http://fi2.php.net/manual/en/function.eval.php
>
--
"Ohjelmoija on organismi joka muuttaa kofeiinia koodiksi" - lpkhttp://outolempi.net/ahdistus/- Satunnaisesti päivittyvä nettisarjis
s...@outolempi. net | rot13(x...@bhgb yrzcv.arg)

[Bocah Sableng]

Re: Resolving {$var} from within a string...

On Apr 18, 2:57 pm, Chris Jones <chris...@gmail .comwrote:

$eid = $_GET['EID'];
$href = str_replace("{$ eid}","{$eid}", db_result($qry, 0,"href");
>

Beware of case-sensitive behaviour of str_replace. Perhaps you should
replace str_replace() with str_ireplace() or just change the variable
name to uppercase. And dollar sign inside double quotes replaced with
its variable value.

$href = str_ireplace("{ $eid}", $eid, db_result($qry, 0,"href");
or
$href = str_replace("{\ $EID}", $eid, db_result($qry, 0,"href");

For a better approach, consider using preg_replace() with pattern like
"/\{\\\$EID\}/". Because preg_replace() can accept array as parameter,
so you can replace multiple variables in single step.
Another method is using preg_replace_ca llback() with reusable callback
function.

HTH