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Definition and Usage. The isset () function checks whether a variable is set, which means that it has to be declared and is not NULL. This function returns true if the variable exists and is not NULL, otherwise it returns false.
isset (mixed $var, mixed ...$vars): bool. Determine if a variable is considered set, this means if a variable is declared and is different than null. If a variable has been unset with the unset () function, it is no longer considered to be set.
24 paź 2012 · Use !empty instead of isset. isset return true for $_POST because $_POST array is superglobal and always exists (set). Or better use $_SERVER['REQUEST_METHOD'] == 'POST' Share
24 wrz 2024 · The isset () function in PHP checks whether a variable is declared and not NULL. It returns true if the variable exists and has a non-NULL value, and false otherwise, without modifying the variable.
isset() jest jednym z najważniejszych narzędzi do walidacji danych w PHP. Jak sama nazwa wskazuje, jest on zaprojektowany w celu sprawdzenia, czy zmienna, która została mu podana, jest ustawiona (isset), zwracając wartość logiczną na podstawie wyniku.
Learn how to use the PHP isset() construct to check if a variable is set and not null. See examples of using isset() with single or multiple variables, arrays, and strings.
17 paź 2024 · What is isset() in PHP? The isset function in PHP is used to determine whether a variable is set or not. A variable is considered as a set variable if it has a value other than NULL.
