PHP ブール値の詳細

echo true === (bool)-1;echo true === (boolean)-1;echo true === (Boolean)-1;

	public function test_true () {		$this->assertTrue(-1 == true); //-1	=> true		$this->assertTrue("false" == true); //"false" => true		$this->assertTrue("null" == true);  //"null"  => true		$this->assertTrue("0.0" == true);   //"0.0"   => true		$this->assertTrue((bool)-1);		$this->assertTrue((boolean)-1);		$this->assertTrue((Boolean)-1);	}	public function test_false () {		$this->assertTrue (null == false);//null => false		$this->assertTrue (0 == false);   //0	 => false		$this->assertTrue (0.0 == false); //0.0	 => false		$this->assertTrue ("" == false);  //""	 => false		$this->assertFalse (" " == false); //" " => true	}