public function testIsInteger()
{
$this->assertTrue(Validation::isInteger(1));
$this->assertTrue(Validation::isInteger(0));
$this->assertTrue(Validation::isInteger(-1));
$this->assertTrue(Validation::isInteger("1"));
$this->assertTrue(Validation::isInteger("0"));
$this->assertTrue(Validation::isInteger("-1"));
$this->assertFalse(Validation::isInteger("-"));
$this->assertFalse(Validation::isInteger("true"));
$this->assertFalse(Validation::isInteger("false"));
$this->assertFalse(Validation::isInteger(true));
$this->assertFalse(Validation::isInteger(false));
$this->assertFalse(Validation::isInteger(4.5));
$this->assertFalse(Validation::isInteger('4.5'));
$this->assertFalse(Validation::isInteger(null));
}
/**
* Tests a variable and returns its equivalent explicit integer value, or null if the variable value doesn't
* represent an integer value.
* @param mixed $value Value to test.
* @return int|null Value explicitly converted to an integer value, or null if the value does not represent an
* integer value.
*/
public static function parseInteger($value)
{
if (Validation::isInteger($value)) {
return (int) $value;
}
return null;
}