$this->uri->segment(3) return an object or a string?

[eluser]huaxz1986[/eluser]
This is OK:

Code:

<?=form_open("collection/modf_col/".$this->uri->segment(3))?>

This work wrong:

Code:

<?=form_open("collection/modf_col/$this->uri->segment(3))"?>

It says that :

A PHP Error was encountered

Severity: 4096

Message: Object of class CI_URI could not be converted to string

Filename: collections/view_modf.php

Line Number: 3

What is "$this->uri->segment(3) " returns?

[eluser]InsiteFX[/eluser]
What does the Error message say?

Object!

[eluser]Phil Sturgeon[/eluser]
You are trying to embed an object method call into a double quote string without the correct parenthesis or concatentation.

Code:

<?=form_open("collection/modf_col/".$this->uri->segment(3)) ?> 

[eluser]huaxz1986[/eluser]
Then,what is the correct usage of "$this->uri->segment(3)"?
I want to get the third segment of uri as an argument.

[quote author="Phil Sturgeon" date="1328813422"]You are trying to embed an object method call into a double quote string without the correct parenthesis or concatentation.

Code:

<?=form_open("collection/modf_col/".$this->uri->segment(3)) ?> 

[/quote]

[eluser]CroNiX[/eluser]
It returns a string, or FALSE if the segment doesn't exist.

[eluser]Phil Sturgeon[/eluser]
[quote author="huaxz1986" date="1328847540"]Then,what is the correct usage of "$this->uri->segment(3)"?
I want to get the third segment of uri as an argument.[/quote]

The code I pasted is the code you want to use, that would be why I posted it. Wrapping method calls in a string is not only pointless but invalid...

[eluser]giriayoga[/eluser]
thank's for your example....