CentOS / Red Hat Linux Install PHP 5.x PECL Filter Extension

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Q. How do I install filter extension for safely dealing with input parameters supplied via a web form using filter_var()?

A. This extension is part of PHP Core version 5.20 and above. Unfortunately, RHEL / CentOS comes with PHP version 5.1.6. So you need to install this extension by typing the following commands.

Install php-devel

You need to install php-devel to compile php extensions:
# yum install php-devel

Download php source code

php_pcre.h header file is not includes with php source code 5.1.6, so you need php source code as well. Visit php.net to grab latest version and store to /opt directory. Use lynx and elinks:
# cd /opt
# elinks http://www.php.net/get/php-5.2.6.tar.bz2/from/a/mirror

Save php source to code to disk. Next, extract source code:
# tar -jxvf php-5.2.6.tar.bz2

Download filter extension

Visit pecl extension to grab latest source code for filter:
# cd /opt
# wget http://pecl.php.net/get/filter-0.11.0.tgz

Install filter extension

Unrar file:
# tar -jxvf filter-0.11.0.tgz
# cd filter-0.11.0

Open logical_filters.c file:
# vi logical_filters.c
Find line that read as follows:

#include "ext/pcre/php_pcre.h"

Change to (the absolute path of php_pcre.h is required):

#include "/opt/php-5.2.6/ext/pcre/php_pcre.h"

Save and close the file. Finally, type the following commands to compile extension:
# phpize
# ./configure
# make install

Configure Filter Extension

Type the following command:
# echo 'extension=filter.so' > /etc/php.d/filter.ini
Restart httpd:
# service httpd restart

Posted by: Vivek Gite

The author is the creator of nixCraft and a seasoned sysadmin and a trainer for the Linux operating system/Unix shell scripting. He has worked with global clients and in various industries, including IT, education, defense and space research, and the nonprofit sector. Follow him on Twitter, Facebook, Google+.

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  1. On CentOS 6 (PHP 5.3.6)…

    [[email protected]]# make
    /bin/sh /opt/filter-0.11.0/libtool –mode=compile cc -I. -I/opt/filter-0.11.0 -DPHP_ATOM_INC -I/opt/filter-0.11.0/include -I/opt/filter-0.11.0/main -I/opt/filter-0.11.0 -I/usr/include/php -I/usr/include/php/main -I/usr/include/php/TSRM -I/usr/include/php/Zend -I/usr/include/php/ext -I/usr/include/php/ext/date/lib -DHAVE_CONFIG_H -g -O2 -c /opt/filter-0.11.0/filter.c -o filter.lo
    libtool: compile: cc -I. -I/opt/filter-0.11.0 -DPHP_ATOM_INC -I/opt/filter-0.11.0/include -I/opt/filter-0.11.0/main -I/opt/filter-0.11.0 -I/usr/include/php -I/usr/include/php/main -I/usr/include/php/TSRM -I/usr/include/php/Zend -I/usr/include/php/ext -I/usr/include/php/ext/date/lib -DHAVE_CONFIG_H -g -O2 -c /opt/filter-0.11.0/filter.c -fPIC -DPIC -o .libs/filter.o
    /opt/filter-0.11.0/filter.c: In function ‘zm_startup_filter’:
    /opt/filter-0.11.0/filter.c:236: error: too few arguments to function ‘sapi_register_input_filter’
    make: ** [filter.lo] Erro 1

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