How do you validate if a property is accessible in php?

Question

With classes containing private properties the property_exists() function returns true (php>5.3). With functions there is a method of is_callable that confirms not only the method exists but it is also available (as an alternative to method_exists()). Is there an equivalent counterpart to this function that will confirm if this property is accessible?

<?php

class testClass {

    private $locked;

    public $unlocked;

    private function hiddenFunction(){
        return "hidden";
    }

    public function visibleFunction(){
        return "visible";
    }

}

$object = new testClass();

var_dump(property_exists($object, "unlocked")); // returns true
var_dump(property_exists($object, "locked")); // returns true > php 5.3

var_dump(method_exists($object, "hiddenFunction")); // returns true but can't be called
var_dump(method_exists($object, "visibleFunction")); // returns true

var_dump(is_callable(array($object, "hiddenFunction"))); // returns false
var_dump(is_callable(array($object, "visibleFunction"))); // returns true

?>

Halayem Anis · Accepted Answer · 2016-03-21 10:40:01Z

0

You can use Reflection class taht will let you reverse-engineer classes, interfaces, functions, methods and extensions.

For example, to get all public properties of a class, you can do as follow :

$reflectionObject    = new ReflectionObject($object);
$testClassProperties = $reflectionObject->getProperties(ReflectionProperty::IS_PUBLIC);
print_r ($testClassProperties);

OUTPUT

Array
(
    [0] => ReflectionProperty Object
        (
            [name] => unlocked
            [class] => testClass
        )

)

to get all public methods of a class, you can do as follow :

$reflectionObject    = new ReflectionObject($object);
$testClassProperties = $reflectionObject->getMethods(ReflectionProperty::IS_PUBLIC);
print_r ($testClassProperties);

OUTPUT

Array
(
    [0] => ReflectionMethod Object
        (
            [name] => visibleFunction
            [class] => testClass
        )

)

edited Mar 21, 2016 at 10:40

answered Mar 21, 2016 at 10:33

Halayem Anis

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2 Comments

Joe Over a year ago

Thanks. It's odd that checking functions can be done with simple php functions but properties need to use the reflection class!

De Paragon Over a year ago

@Joe <pre> function isPublic($property, $object) { $r_object = new ReflectionObject($object); $properties = $r_object->getProperties(ReflectionProperty::IS_PUBLIC); if (is_array($properties) && count($properties) >0) { foreach ($properties as $ppt) { if ($ppt->name == $property) { return true; } } } return false; } </pre>

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