![]() This can be useful to check the submit button is clicked or not. Undefined without isset Function C time 1.3804969787598. 7 Answers Sorted by: 16 For returns from functions, you use neither isset nor empty, since those only work on variables and are simply there to test for possibly non-existing variables without triggering errors. PHP isset() function is used to check if a variable has been set or not. I have input with name of 'username' and what I need is when I send the form to check whether the value was sent with the form I want to print the property inside input as: < input type'text' n. ![]() The problem is that when the php error occurred, the variable of $value in line 792 (. Defined without isset Function B time 0.72514510154724.
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