The specified permitted characters in variable names (including the first character) are somewhat more permissive than you might expect.
The specified regex is [a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]* (from ./functions.user-defined.php)
On running the following you can see those outside of [a-zA-Z0-9_] that work. Your browser/shell may not display all properly, and some editors (I tested in Textmate) may simply remove things it doesn't grok as whitespace. However, there are some pretty sexy characters in there should you be looking for a unique namespace which is not too lengthy. Using them can be inconvenient for others who may not have a suitable keyboard for single-stroke entry (mine is Spanish). Best used for a program's internally relevant methods - which are those we wish least to pollute a namespace.
<?php
header('Content-type:text/plain; charset=utf-8');
function unichr($u) {
return mb_convert_encoding('&#'.intval($u).';', 'UTF-8', 'HTML-ENTITIES');
}
for($i = hexdec("7f"); $i <= hexdec("ff"); $i++) echo unichr($i)."\n";
// simple example
function ñ(){
echo "I'm ok!";
}
ñ();
?>
Guida Denominazione Spazio Utente
Indice dei contenuti
La seguente è una guida per come scegliere meglio i nomi per gli identificatori nel codice PHP dello spazio utente. Quando si scelgono i nomi per ogni codice che crea i simboli nel namespace globale, è importante prendere in considerazione le seguenti linee guida per evitare che le future versioni di PHP possano scontrarsi con i propri simboli.
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User Contributed Notes 1 note
clancy hood at gmail dot com ¶
15 years ago
