Description:
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This problem happens with php 5.3, on 5.2 doesn't show up. Tried on linux (default php 5.3.2 packages from ubuntu 10.04 beta1) and windows (php 5.3.2 from easyphp).

Sometimes when I use a variable variable (name of the variable in curly brackets) as a function argument the script doesn't work as expected (execution time or memory limits are reached). This happens only in a few places in my script (most times the same function with same arguments works fine) and in those places if I replace the variable variables with normal variables it works normally.

Test script:
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You can download my script from:

http://www.digitaldruid.net/download/php-residence_1.2.2.zip

Install it (mysql, postgresql or sqlite needed), once you get to "main menu" click on "configure and customize" --> "internet templates" --> "availability template", this page will stop loading when the affected function is reached.

This function is called (twice) in file php-residence/crea_modelli.php from line 215:

mostra_menu_date("./dati/selectperiodi$anno_modello.1.php","inizioperiodo$num1",${"inizioperiodo".$num1},"","",$id_utente,$tema);
echo " ".mex("al",$pag)." ";
mostra_menu_date("./dati/selectperiodi$anno_modello.1.php","fineperiodo$num1",${"fineperiodo".$num1},"","",$id_utente,$tema);

if I replace the above code with:

$inizioperiodo = ${"inizioperiodo".$num1};
$fineperiodo = ${"fineperiodo".$num1};
mostra_menu_date("./dati/selectperiodi$anno_modello.1.php","inizioperiodo$num1",$inizioperiodo,"","",$id_utente,$tema);
echo " ".mex("al",$pag)." ";
mostra_menu_date("./dati/selectperiodi$anno_modello.1.php","fineperiodo$num1",$fineperiodo,"","",$id_utente,$tema);

then the page loads fine. The function mostra_menu_date is located in file php-residence/includes/funzioni.php