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Editorial Team
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Asked: 2026-05-29T13:27:30+00:00

Using PHP 5.3.8. I’m attempting to implement two functions, save($adoption) which serializes an Adoption

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Using PHP 5.3.8.

I’m attempting to implement two functions, save($adoption) which serializes an Adoption instance, appends a delimiter, then appends it to the end of a text file, and loadAdoptions(), which opens the text file, explode()s the contents on the delimiter, and unserialize()s each object in a for loop through the contents of the array explode() returned then calls Display() on them.

Here’s the shortest form reproducing my problem:

<html><head><title>Request Processed</title></head><body>
<?php
class Dog {
    var $name; 
}

class Adoption
{
    var $dog;

    function Display()
    {
        echo $dog->name;
    }
}

function save($adoption)
{
    file_put_contents("../adoptions/adoptions.txt", (serialize($adoption)."<!-- E -->"));
 }

function loadAdoptions()
{
    $filename = '../adoptions/adoptions.txt';
    if (file_exists($filename)) 
    {
        $datain = file_get_contents($filename);
        $out = explode("<!-- E -->", $datain);

        echo "<br /><u>Retrieved Data</u><br />";
        $count = count($out);
        echo 'Count: '.$count;

        for ($i = 0; i < $count; $i++)
        {
            $curAdoption = unserialize($out[i]);
           if (curAdoption)
                echo $curAdoption->Display();
            else
                echo 'Error Reading Record.';
            echo '<br />';
        }

    }
}

$newDog = new Dog();
$newDog->name = "Scruffles";
$newAdoption = new Adoption();
$newAdoption->dog = newDog;
save(newAdoption);
loadAdoptions();
?>
</body></html>

On line 38, where Display() is called, Fatal error: Call to a member function Display() on a non-object

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1 Answer

  1. Editorial Team

    Quite a few times, you’ve missed the $ off the front of a variable. Also to access a class’s member variable from a method (getting dog’s name in Display() you need to use $this->dog.

    Working source:

    <html><head><title>Request Processed</title></head><body>
<?php
class Dog {
    var $name; 
}

class Adoption
{
    var $dog;

    function Display()
    {
        echo $this->dog->name;
    }
}

function save($adoption)
{
    file_put_contents("../adoptions/adoptions.txt", (serialize($adoption)."<!-- E -->"));
 }

function loadAdoptions()
{
    $filename = '../adoptions/adoptions.txt';
    if (file_exists($filename)) 
    {
        $datain = file_get_contents($filename);
        $out = explode("<!-- E -->", $datain);

        echo "<br /><u>Retrieved Data</u><br />";
        $count = count($out);
        echo 'Count: '.$count;

        for ($i = 0; $i < $count; $i++)
        {
            $curAdoption = unserialize($out[$i]);
           if ($curAdoption)
                echo $curAdoption->Display();
            else
                echo 'Error Reading Record.';
            echo '<br />';
        }

    }
}

$newDog = new Dog();
$newDog->name = "Scruffles";
$newAdoption = new Adoption();
$newAdoption->dog = $newDog;
save($newAdoption);
loadAdoptions();
?>
</body></html>
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