Call to a member function on a non-object

PHP
1

Hey I’m rather new at PHP and I’m getting this error : Call to a member function getTutorial() on a non-object in actionScheduleValidation

This picture shows the error I get.

1920×1080 159 KB

here’s the call( i was going to put the picture but here’s the code)
Here’s the call that is creating an error → echo $errorArr[$i]->getTutorial()->getSectionID(); It’s weird because the function verification ( which is a bit lower in the code) invokes getTutorial() perfectly fine on Courses object ( which this array is shown to be in the picture above!)

if ($errorArr != null) {
            echo "before error";
            for($i=0; $i<count($errorArr); $i++){
                for($m=0; $m<count($errorArr[$i]); $m++) {
					
                    var_dump($errorArr[$i]);
					echo $errorArr[$i]->getTutorial()->getSectionID();
				
                }

                }



            var_dump($errorArr);
			echo 0;
            $sectionID = array();
			/*for($i = 0; $i<count($errorArr)){
                for($m=0; $m < count($errorArr[]); $m++){
                    $sectionID[$m] = $errorArr[$i][$m]->getTutorial() -> getSectionID();
                }
            }*/
            echo json_encode($errorArr);


		} else {
			echo 1;
		}

	} else
		echo 2;

}

function verification(&$arrayOfSemester){

	$errorArr = [];
	for($key = 0 ; $key <count($arrayOfSemester)- 1; $key++){

		$startLecTimeAtKey = $arrayOfSemester[$key]->getLecture() -> getStartTime();
        echo $startLecTimeAtKey;

		$endLecTimeAtKey = $arrayOfSemester[$key]->getLecture()->getEndTime();
		$startTutTimeAtKey = $arrayOfSemester[$key] -> getTutorial()->getStartTime();
		echo $startTutTimeAtKey;
		$endTutTimeAtKey = $arrayOfSemester[$key] -> getTutorial() -> getEndTime();
        $dayOfLec = $arrayOfSemester[$key] ->getLecture() -> getDays();
		$dayOfTut = $arrayOfSemester[$key] ->getTutorial() -> getDays();
        $daySofLec = array();
        if(strlen($dayOfLec) >= 2){
           $daySofLec = str_split($dayOfLec);
        }

However, as you can see getTutorial is called in verification with no issues. Now, I know that my coding is a bit everywhere and heavy in terms of lines. However, as seen above, when using var_dump on $errorArr[$i] I get 2 outputs. At index 1 I get an object of type Course that contains both tutorial and lecture. Here’s the class course:

class Courses
{
    private  $lecture;
    private  $tutorial;

    public function __construct(Lecture $lec, TutorialAndLab $tutorial){
        $this->lecture = $lec;
        $this->tutorial = $tutorial;
    }

    /**
     * @return mixed
     */
    public function getLecture()
    {
        return $this->lecture;
    }

    /**
     * @param mixed $lecture
     */
    public function setLecture($lecture)
    {
        $this->lecture = $lecture;
    }

    /**
     * @return mixed
     */
    public function getTutorial()
    {
        return $this->tutorial;
    }

    /**
     * @param mixed $tutorial
     */
    public function setTutorial($tutorial)
    {
        $this->tutorial = $tutorial;
    }

shouldn’t getTutorial works in my case above? I just can’t seem to find the error. I can also post the code straight up if need be!

2

What’s the function of the “for m …” loop in your error display code?

3

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