check if is empty code example

Example 1: php code to check if variable is null

if(empty($var1)){
    echo 'This line is printed, because the $var1 is empty.';
}

Example 2: javascript if string empty

// Test whether strValue is empty or is None
if (strValue) {
    //do something
}
// Test wheter strValue is empty, but not None 
if (strValue === "") {
    //do something
}

Example 3: empty string in javascript

var s; // undefined
var s = ""; // ""
s.length // 0

Example 4: php check empty variable

empty var php