Online PHP editor | output for IhXsh

@ 2015-09-07T18:23:57Z

<?php

class Base
{
    private $basePrivate = 'private in base class';
    protected $baseProtected = 'protected in base class';
    public $basePublic = 'public in base class';
    
    public function baseExample()
    {
        // We *can't* access $this->doesNotExist because it doesn't exist.
        echo $this->doesNotExist;
        
        // We *can* access the following:
        echo __LINE__ . ': ' . $this->basePrivate . "\n";
        echo __LINE__ . ': ' . $this->baseProtected . "\n";
        echo __LINE__ . ': ' . $this->basePublic . "\n";
    }
}

class Child extends Base
{
    private $childPrivate = 'private in child class';
    protected $childProtected = 'protected in child class';
    public $childPubilc = 'public in child class';
    
    public function childExample()
    {
        // We can't access $this->basePrivate because the base class
        // declared it as private (this is the what private means)
        echo $this->basePrivate;
        
        // We can't access $this->doesNotExist because it doesn't exist.
        echo $this->doesNotExist;
        
        // We *can* access the following:
        echo __LINE__ . ': ' . $this->baseProtected . "\n";
        echo __LINE__ . ': ' . $this->basePublic . "\n";
        echo __LINE__ . ': ' . $this->childPrivate . "\n";
        echo __LINE__ . ': ' . $this->childProtected . "\n";
        echo __LINE__ . ': ' . $this->childPublic . "\n";
    }
}

// Now we'll create instances of these classes. Since we're now outside of the
// classes (i.e. we're using instances of the classes and not in the actual code of the class)
// we can now only access public properties.
$base = new Base;
$child = new Child;

// Let's run our demo methods to see the results
echo $base->baseExample();
echo $child->childExample();

// Outside the class, we *can't* access the following:
echo $base->doesNotExist;
echo $base->basePrivate;
echo $base->baseProtected;
echo $child->doesNotExist;
echo $child->basePrivate;
echo $child->baseProtected;
echo $child->childPrivate;
echo $child->childProtected;

// Outside the class, we *can* access public properties
echo __LINE__ . ': ' . $base->basePublic . "\n";
echo __LINE__ . ': ' . $child->basePublic . "\n";
echo __LINE__ . ': ' . $child->childPublic . "\n";

Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7: Warning: Undefined property: Base::$doesNotExist in /in/IhXsh on line 12 15: private in base class 16: protected in base class 17: public in base class Warning: Undefined property: Child::$basePrivate in /in/IhXsh on line 31 Warning: Undefined property: Child::$doesNotExist in /in/IhXsh on line 34 37: protected in base class 38: public in base class 39: private in child class 40: protected in child class Warning: Undefined property: Child::$childPublic in /in/IhXsh on line 41 41: Warning: Undefined property: Base::$doesNotExist in /in/IhXsh on line 56 Fatal error: Uncaught Error: Cannot access private property Base::$basePrivate in /in/IhXsh:57 Stack trace: #0 {main} thrown in /in/IhXsh on line 57
Process exited with code 255.
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.31, 7.4.0 - 7.4.33: Notice: Undefined property: Base::$doesNotExist in /in/IhXsh on line 12 15: private in base class 16: protected in base class 17: public in base class Notice: Undefined property: Child::$basePrivate in /in/IhXsh on line 31 Notice: Undefined property: Child::$doesNotExist in /in/IhXsh on line 34 37: protected in base class 38: public in base class 39: private in child class 40: protected in child class Notice: Undefined property: Child::$childPublic in /in/IhXsh on line 41 41: Notice: Undefined property: Base::$doesNotExist in /in/IhXsh on line 56 Fatal error: Uncaught Error: Cannot access private property Base::$basePrivate in /in/IhXsh:57 Stack trace: #0 {main} thrown in /in/IhXsh on line 57
Process exited with code 255.
Output for 7.3.32 - 7.3.33: 15: private in base class 16: protected in base class 17: public in base class 37: protected in base class 38: public in base class 39: private in child class 40: protected in child class 41: Fatal error: Uncaught Error: Cannot access private property Base::$basePrivate in /in/IhXsh:57 Stack trace: #0 {main} thrown in /in/IhXsh on line 57
Process exited with code 255.
Output for 5.4.2 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28: Notice: Undefined property: Base::$doesNotExist in /in/IhXsh on line 12 15: private in base class 16: protected in base class 17: public in base class Notice: Undefined property: Child::$basePrivate in /in/IhXsh on line 31 Notice: Undefined property: Child::$doesNotExist in /in/IhXsh on line 34 37: protected in base class 38: public in base class 39: private in child class 40: protected in child class Notice: Undefined property: Child::$childPublic in /in/IhXsh on line 41 41: Notice: Undefined property: Base::$doesNotExist in /in/IhXsh on line 56 Fatal error: Cannot access private property Base::$basePrivate in /in/IhXsh on line 57
Process exited with code 255.

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