php module miss match

I am using ubuntu 18.04 that comes with php7.2
I used the tutoral to adding muilpal php versions to use with ispconfig3
as i need php 5.2 i installed that with no problem, but when trying to install extentions, i get problems:

Code:

module compiled with module api=20090626 php compiled with module api=20100525

i know this is about the phpize and php-config files, i've done this many times in past with know problem but this time i cant get it to work,
for example i installing the php ffmpeg extenion and normally i would install using this method:

Code:

/opt/php-5.2.17/bin/phpize
./configure \
--prefix=/usr/local/src/php5-build/php-5.2.17/ffmpeg-php \
--with-ffmpeg=/usr/local/cpffmpeg \
--with-php-config=/opt/php-5.2.17/bin/php-config
make
make install

but the phpize output is:

Code:

phpize
Configuring for:
PHP Api Version:         20041225
Zend Module Api No:      20060613
Zend Extension Api No:   220060519

please help!!!