CODEWITHSUNDEEP
php
Cheok Yan Cheng
Cheok Yan Cheng

Reputation: 42760

property_exists doesn't work on class property which is generated dynamically

I have the following PHP class, which its properties is generated dynamically during running time.

<?php

class ParamEx
{
    private $params = array();

    public function __get($name) {
        return $this->params[$name];
    }

    public function __set($name, $value) {
        $this->params[$name] = $value;
    }
};

$paramEx = new ParamEx();
$property = "dummy_property";
$paramEx->$property = "123";

// "123" printed
echo $paramEx->$property . "\n";

// Nothing printed
echo property_exists($paramEx, $property) . "\n";

I realize property_exists doesn't work for such case.

Is there any way I can make it work?

Upvotes: 1

Views: 1895

Answers (2)

Okonomiyaki3000
Okonomiyaki3000

Reputation: 3696

If I were you, I'd add a public method to this class like this:

public function propertyExists($property) { return property_exists($this, $property) || isset($this->params[$property]); }

If you have a lot of classes like this (and you're using php 5.4 or better), you might want to consider doing this function as a Trait which you can use in all of those classes.

Upvotes: 5

vee
vee

Reputation: 38645

You could overload __isset and use isset($paramEx->$property) since you're already overloading __get and __set: 

class ParamEx
{
    private $params = array();

    public function __get($name) {
        return $this->params[$name];
    }

    public function __set($name, $value) {
        $this->params[$name] = $value;
    }

    public function __isset($name) {
        return isset($this->params[$name]);
    }
};

Then use: 

echo isset($paramEx->$property) . "\n";

instead of: 

// Nothing printed
echo property_exists($paramEx, $property) . "\n";

Upvotes: 3

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