[Ubuntu], How to solve

[Ubuntu]
$ch =cur_init ();
Execution error, prompting
PHP Fatal error:call to undefined function cur_init ();
But the php5 php5-curl php-cli Curl is installed

#curl-V
Curl 7.22.0 (X86_64-PC-LINUX-GNU) libcurl/7.22.0 openssl/1.0.1 zlib/1.2.3.4 libidn/1.23 librtmp/2.3
Protocols:dict file ftp FTPs Gopher HTTP HTTPS IMAP imaps LDAP POP3 pop3s rtmp rtsp smtp Smtps telnet tftp
Features:gss-negotiate IDN IPv6 largefile NTLM ntlm_wb SSL libz TLS-SRP
#php-V
PHP 5.3.10-1ubuntu3.13 with Suhosin-patch (CLI) (Built:jul 7 2014 18:54:55)
Copyright (c) 1997-2012 the PHP Group
Zend Engine v2.3.0, Copyright (c) 1998-2012 Zend Technologies

But to see if the extension was loaded, the hint did not load:
Exception:extension Curl does not exist

How can i solve this problem?
------Solution--------------------
Did you write Curl_init a cur_init?

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