Question

How to check whether a variable is set or not in PHP

Answer 1

$var = '';

if (isset($var)) {
    echo "set";
}
else {
    echo "not set";
}




/*
run:

set

*/

 

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Answer 2

$var = 'php';

if (isset($var)) {
    echo "set";
}
else {
    echo "not set";
}




/*
run:

set

*/

 

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Answer 3

$var = null;

if (isset($var)) {
    echo "set";
}
else {
    echo "not set";
}




/*
run:

not set

*/

 

70+ SQL courses for beginners and professionals

Answer 4

if (isset($var)) {
    echo "set";
}
else {
    echo "not set";
}




/*
run:

not set

*/

 

70+ SQL courses for beginners and professionals