Question

How to check whether a variable is empty in PHP

Answer 1

$var = '';

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




/*
run:

empty

*/

 

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Answer 2

$var = 0;

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




/*
run:

empty

*/

 

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Answer 3

$var = null;

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




/*
run:

empty

*/

 

70+ SQL courses for beginners and professionals

Answer 4

$var = false;

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




/*
run:

empty

*/

 

70+ SQL courses for beginners and professionals

Answer 5

$var = true;

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




/*
run:

not empty

*/

 

70+ SQL courses for beginners and professionals

Answer 6

$var = "php";

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




/*
run:

not empty

*/

 

70+ SQL courses for beginners and professionals

Answer 7

$var = array();

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




/*
run:

empty

*/

 

70+ SQL courses for beginners and professionals

Answer 8

$var = array("php", "c", "c++", "java");

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




/*
run:

not empty

*/

 

70+ SQL courses for beginners and professionals