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Guia de Entorno de Usuario para Nombres

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Lo siguiente es una guía para saber cómo elegir el mejor nombre para los identificadores del código del entorno del usuario PHP. Cuando se eligen nombres para cualquier código que crea símbolos en el global namespace, es importante tener en cuenta los siguientes lineamientos para evitar que en futuras versiones de PHP estos choquen con los símbolos elegidos.

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clancy hood at gmail dot com
5 years ago
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();

?>
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