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PHP-fpm Too Many Open Files 24 Error (set open file descriptor limit)

I am getting the following error in my /var/log/php7.0-fpm.log file:
        “ERROR: failed to prepare the stderr pipe: Too many open files (24)
How do I fix this problem?
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A serious vulnerability was discovered in how CGI scripts are used by Linux or Unix that use PHP, Go, Python, and other scripting languages. How do I fix Httpoxy a CGI application vulnerability on Linux or Unix for HAProxy, Varnish, Nginx, PHP, Go, Python, Tomcat and others?
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How to install PHP 7 on Ubuntu Linux 14.04 LTS

PHP 7 provides 2x faster performance and 50% better memory consumption than PHP version 5.6. How do I install PHP 7 on Ubuntu Linux version 14.04 LTS server? How do I install PHP 7 with PHP-FPM in along with Nginx web server?
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How to install Composer on Debian / Ubuntu Linux

I‘m trying to upgrade my Mediawiki installation and I’m getting an error that read as follows:
    Error: your composer.lock file is not up to date, run “composer update” to install newer dependencies
How do I install composer command for my PHP installation on Debian or Ubuntu Linux running LAMP or LEMP stack? How do I Install and use Composer on running Ubuntu Linux server and fix this problem for mediawiki installation and/or manage and install PHP packages and dependencies for my project?
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Debian 8 and Ubuntu 14.04 LTS Install Suhosin PHP Extension To Protect Your Server

Suhosin is an advanced protection system for PHP installations. It was designed to protect servers and users from known and unknown flaws in PHP applications and the PHP core. How can I install suhosin extension on a Debian v8.x or Ubuntu Linux 14.04 LTS server?
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Ubuntu Linux 12.04/14.04 LTS Install Memcached Server For Python and PHP Apps

I‘m a new Ubuntu 12.04/14.04 server user. How do I install and use memcached on an Ubuntu Linux 14.04 LTS server? How can I my apps written in PHP or Python can use memcached on an Ubuntu LTS server?
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How To Install Apache, MySQL, PHP stack on FreeBSD Unix Server

I‘m a new FreeBSD Unix system users. How can I setup and install Apache, MySQL, PHP stack on a FreeBSD 10 based Unix server?
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Install LEMP (Linux, Nginx, MySQL and PHP) Stack on Ubuntu Linux 14.04 LTS

I‘m a new Ubuntu Linux user. How do I install the LEMP stack on an Ubuntu Linux 14.04 LTS server using command line options to serve dynamic web apps?
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CentOS and RHEL 7: Install Linux, Apache, MariaDB, PHP (LAMP) Stack

I am new Red Hat Enterprise Linux version 7 user/sysadmin/developer. This version made the big number change for RHEL 7/CentOS 7. How can I install LAMP (Linux, Apache, MariaDB, PHP) stack on a RHEL version 7 or CentOS Linux version 7 using CLI or over ssh based session?
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CentOS / RHEL: Install php-tidy Module / Extension

I am a new CentOS / RHEL / Red Hat / Fedora Linux server user. I need to provide tidy library support using php. How do I install php-tidy on RHEL or CentOS Linux for Apache server?
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