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Last updated: Tue, 29 Oct 2002 view the printer friendly version or the printer friendly version with notes or change language to Czech \| Finnish \| German

isset

(PHP 3, PHP 4 )

isset -- Determina si una varible está definida

Descripción

int isset ( mixed var)

Devuelve TRUE si var existe; y FALSE en otro caso.

Si una variable ha sido destruida con unset(), ya no estará definida (no será isset()).

$a = "test";
echo isset($a); // true
unset($a);
echo isset($a); // false

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Last updated: Thu Oct 31 18:34:28 2002 EST