PHP Programación Tips

Nombres de variables dinámicos en PHP

[titulo]Variables con nombre dinámico en PHP[/titulo]

Como seguro que ya sabéis, PHP puede generar arrays que almacenen varios valores bajo el mismo nombre de variable, de tal manera que podamos llamar a un valor concreto conocida su posición:

<?php
     $mivariable = array("foo", "bar", "hello", "world");
     var_dump($mivariable );
?>

Pero si eso no nos sirve, y lo que [subraya_verde]queremos es que el nombre mismo de la variable vaya cambiado[/subraya_verde] cada vez, podemos recurrir a lo siguiente:

${"mivariable" . $i}

Esto posibilita crear cualquier bucle o iteración que de como resultado algo como:

[codigo]$mivariable1[/codigo], [codigo]$mivariable2[/codigo], [codigo]$mivariable3[/codigo], [codigo]$mivariable4[/codigo]…

 

Un ejemplo de un bucle para cambiar el nombre de la variable iterando y asignando un valor distinto a cada una de ellas sería:

$i = 0;
while(*La condición que queráis*) {
     $i++;
     ${"miraviable" . $i} = "El valor que quiera";
}

 

Otra forma de conseguir lo mismo es con [codigo]$$mivariable[/codigo].

El doble símbolo del dólar nos permite crear una variable cuyo nombre será el contenido de otra. Por ejemplo:

//Creo una variable y le asigno el valor 'hola'
$a = 'hola';

//Creo una segunda variable poniéndole el doble $$. Eso hará que se llame con el contenido de la primera, 'hola', pero tenga el contenido que le asignemos.
$$a = 'mundo';

//Esto imprime 'hola mundo'
echo "$a $hola";

//Pero esto también imprimirá 'hola mundo'
echo "$a ${$a}";

 

Y hasta aquí este pequeño tip. ¿Te ha servido de ayuda? ¡Ayúdanos tú ahora compartiendo este contenido en redes sociales!

 

Cristian Sarabia Martínez

Desde que a principios de los 90 mi padre desempolvó su Spectrum, no he dejado de probar y experimentar con la tecnología.

Enamorado del mundo web, Full Stack Developer de profesión y diseñador por devoción.

Ahora hago mis pinitos en esto del blogging para compartir con vosotros un poquito de todo lo que la comunidad me ha dado.

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