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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.
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24 Οκτ 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
isset — Determine if a variable is declared and is different than null. 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 Σεπ 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. Syntax bool isset( mixed $var [, mixed $... ] ) Parameters:
6 Οκτ 2015 · The isset function is used to check whether a variable is set or not. If a variable is already unset with unset() function, it will no longer be set. The isset() function return false if testing variable contains a NULL value.
2 Φεβ 2024 · PHP $_POST is a super-global variable that can contain key-value pair of HTML form data submitted via the post method. We will learn different methods to check if $_POST exists and contains some data in this article. These methods will use isset(), empty(), and empty string check.
7 Ιουν 2019 · isset() is one of the most important tools at your disposal to validate data in PHP. As the name implies, it is designed to verify if a variable given to it is set, returning a boolean value...
