is_scalar

The function is_scalar() will check if the variable holds a scalar value. This means, it checks if the variable is a integer, boolean, float or string.
It returns false if the variable is not scalar, if it is, it will return true

// Return: Scalar
if (is_scalar('Hello World')) echo 'Scalar'; else echo 'Not scalar';

// Return: Not scalar
if (is_scalar(array())) echo 'Scalar'; else echo 'Not scalar';

// Return: Not scalar
if (is_scalar(new stdClass())) echo 'Scalar'; else echo 'Not scalar';

// Return: Scalar
if (is_scalar(582.58)) echo 'Scalar'; else echo 'Not scalar';

// Return: Scalar
if (is_scalar(true)) echo 'Scalar'; else echo 'Not scalar';

// Return: Scalar
if (is_scalar(35)) echo 'Scalar'; else echo 'Not scalar';

Result:

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