Getting environment variables

Get environment variable value: getenv()

The function getenv() retrieves the value of an environment variable. The function has an optional parameter: the name of the variable. It returns a string with the value of the variable. For example, in order to display the environment variable PATH:

echo getenv("PATH");

If you use a name of variable that does not exist, it returns the boolean value false:

echo getenv("var_that_not_exists"); // bool false

All environment variables

If you call the function without any parameter all environment variables will be returned as an array:

$envVars = getenv();
print_r($envVars); // array of strings