Web Reference: 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. 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. PHP isset() returns true if a variable is set and not null. The isset() is a language construct, not a function. Therefore, you cannot assign it to a variable, return it from a function, or call it dynamically via a variable function. The following example will result in an error: Error: To work around it, you can create a function that uses the is...
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