There are a number of things that can go wrong in code and they bound to through errors, even if you’ve tested them hundreds of times. PHP provides some error handling methods such as error_reporting(), set_error_handler(), error_log(), restore_error_handler() for handling errors in the PHP code.
error_reporting - Sets which PHP errors are reported.
int error_reporting ([ int […]

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Install these packages with apt:
php5
php5-cli
php5-dev
php5-sqlite
php-pear
$ sudo apt-get install php5 php5-cli php5-dev php5-sqlite php-pear
Test if Apache and PHP are up and running typing in the browser:
http://localhost/
You should see something like:
Apache/2.0.55 (Ubuntu) PHP/5.1.2-1ubuntu1 Server at localhost Port 80
From the command line, as root:
$ sudo pear upgrade PEAR
$ sudo pear channel-discover pear.symfony-project.com
Edit /etc/php5/cli/php.ini and change the line:
memory_limit = […]

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In Redhat and Fedora you can use the command ‘yum’
yum -y install php
yum -y install php-devel
yum -y install php-gd
yum -y install php-imap
yum -y install php-ldap
yum -y install php-mysql
yum -y install php-odbc
yum -y install php-pear
yum -y install php-xml
yum -y install php-xmlrpc
yum -y install curl
yum -y install curl-devel
yum -y install perl-libwww-perl
yum -y install ImageMagick
yum -y install libxml2
yum […]

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