Null True False in PHP

In PHP, you can check for null, true, or false using various functions and operators. Here are some examples:

1. Checking for null:

You can use the is_null() function to check whether a variable is null or not:

$value = null;
if (is_null($value)) {
   echo "value is null";
} else {
   echo "value is not null";
}

Output:

value is null

2. Checking for true/false:

You can use the var_dump() function to check the type and value of a variable:

$value = true;
var_dump($value);

Output:

bool(true)

You can also use the === operator to check whether a variable is true or false:

$value = false;
if ($value === true) {
   echo "value is true";
} else {
   echo "value is false";
}

Output:

value is false