Set an attribute of a object with a string attribute name in PHP

Question

I want to be able to set an attribute of an object but the attribute name would be generated. How can I accomplish this in PHP, without using eval()

e.g.:

$obj->name = "Prakash Raman"; // Works
$obj->$attr_name = <some value>; // Would want something like this to work

I would like to be able to change $attr_name.

Thanks.

jondavidjohn · Accepted Answer · 2012-01-10 20:29:00Z

8

$obj->{$attr_name} = "New value";

This will accomplish exactly that.

A word of caution though, I would reccomend using it in conjunction with property_exists() to verify the existence of the property.

answered Jan 10, 2012 at 20:29

jondavidjohn

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Comments

Kyle · Accepted Answer · 2012-01-11 00:04:18Z

1

I understand the question has a valid answer, but just to add onto the many ways you can do this:

<?php
$myClass = new ReflectionClass($someClass);
if($myClass->hasProperty($someProperty)){
   $myClass->getProperty($someProperty)->setValue($someClass,__NEW__VALUE__);
}
?>

answered Jan 11, 2012 at 0:04

Kyle

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Comments

benesch · Accepted Answer · 2012-02-18 16:35:37Z

1

Funnily enough, your code as posted will work. (++ for property_exists, though.)

http://codepad.org/qW0Tj4MR

edited Feb 18, 2012 at 16:35

answered Jan 10, 2012 at 20:33

benesch

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