Frequently Asked Questions About Linux / UNIX » PHP

Apache / Nginx / Lighttpd: PHP Disable File Upload

nixCraft — Sun, 14 Apr 2013 07:31:55 +0000

I am in the process of setting Apache and PHP for my small business server. I'm not utilizing file upload functionality in any of my PHP scripts. How do I disallow uploading files under CentOS or Ubuntu Linux based LAMP server?

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PHP: Disable APC Module At Command Line CLI Scripts / Cron Scripts

nixCraft — Mon, 05 Nov 2012 17:13:24 +0000

I have a PHP application developed and running on LAMP. I have APC installed on the server. APC is a free, open, and robust framework for caching and optimizing PHP intermediate code. The APC based caching is good for my web site, but my cron jobs and php cli scripts fail to

fetch correct data due to caching. How do I disable APC module at the command line (php-cli) under Linux or Unix like operating systems for all my cron jobs?

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PHP Warning: fread(): Length parameter must be greater than 0 in setoptions.php on line 311 Error and Solution

nixCraft — Sat, 20 Oct 2012 19:29:58 +0000

One of my php script called setoptions.php is hosted on my new vps server. However, it is not working so I setup php error log as described here and, and I see the following warning repeated in my log file: PHP Warning: fread(): Length parameter must be greater than 0 in /var/www/html/scripts/setoptions.php on line 311 The line no # 311 is as follows in my php script: $fname = 'myappconfig.php'; $content = fread($fhandle,filesize($fname)); How do I fix this problem under Unix/Apache/php5 server?

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CentOS / RHEL: Install and Configure phpMyAdmin Administration Of MySQL Database Server

nixCraft — Wed, 25 Jul 2012 08:58:11 +0000

How do I install phpMyAdmin to handle the administration of MySQL database server over the World Wide Web under Fedora / Scientific / CentOS / RHEL / Red Hat Enterprise Linux 6.x server systems?

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PHP: Require_once(): Unable To Allocate Memory For Pool Error and Solution

nixCraft — Fri, 20 Jul 2012 12:08:10 +0000

I'm running PHP version 5.3.3 on CentOS / RHEL 6.x with APC php-pecl-apc-3.1.9. However, I'm getting the following warnings in my php server log file:

[01-Jul-2012 10:50:49] PHP Warning: require_once(): Unable to allocate memory for pool. in /var/www/html/includes/admin.php on line 57 [18-Jul-2012 17:00:08] PHP Warning: include_once(): Unable to allocate memory for pool. in //var/www/html/includes/xmlrpc.php on line 55 [18-Jul-2012 17:00:40] PHP Warning: require(): Unable to allocate memory for pool. in /var/www/html/includes/geshi.php on line 2307

How do I fix these php warnings?

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PHP: GeSHi Syntax Highlighter Enable / Disable Line Numbers

nixCraft — Mon, 25 Jun 2012 10:06:38 +0000

I'm using GeSHi under php to highlight a source code. How do I turn on or off line numbers using GeSHi?

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Find Out PHP Version installed On Unix / Linux Server

nixCraft — Sat, 21 Jan 2012 19:52:49 +0000

How do I find out php version under Linux operating systems? How do I find out php version under Unix like systems? How to find out what version of PHP is installed on my server?

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PHP: Tags Not Working in PHP 5.3.x under UNIX / Linux

nixCraft — Tue, 18 Jan 2011 11:19:14 +0000

I've recently installed php 5.3.5 in my UNIX box and my old working php code not working. It displays code in pages which is in <? ... my code ... ?> php tags. How do I fix this problem?

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Linux: phpinfo() system’s timezone error date.timezone

nixCraft — Tue, 18 Jan 2011 00:58:05 +0000

I'm getting the following errors in my log file whenever I use phpinfo() function:

[10-Jan-2011 18:39:08] PHP Warning: phpinfo(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'America/Chicago' for 'CST/-6.0/no DST' instead in /home/servers/http/dev/testpc.php on line 2

How do I fix this problem under UNIX / Linux php running Apache or lighttpd web server?

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HowTo: PHP Compare Two Text Strings

nixCraft — Thu, 06 Jan 2011 18:41:15 +0000

How can I compare two strings using php? How do I use php to compare two strings?

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Mediawiki Fix Internal Server Host Names / Redirection In shared Hosting or Proxy Setup

nixCraft — Sun, 19 Dec 2010 21:57:17 +0000

Our customer support wiki runs on an internal host (ip:192.168.1.100:300, hostname a-node100.:300) and it is behind the nginx reverse proxy server. However, our Apache server end up displaying internal server name http://a-node100.:300/, which results into an unexpected redirection and timeouts as http://a-node100.:300/ is not accessible over the Internet. How do I force nginx or apache to use the base URL of our server (http://support.example.com/wiki/)?

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WordPress Rename Image URL For a CDN Usage

nixCraft — Sat, 20 Nov 2010 20:41:47 +0000

Recently, we moved all our static assets to a CDN as described here. However, we have over 8000+ old blog posts and we need to point static images url to our CDN account hosted at http://MyACCOUNT.cloudfront.net/images/ folder. How do I rename all image urls stored in wordpress posts? How do I offload static images to a CDN urls under Wordpress?

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Linux / UNIX: PHP mail() Error Log File

nixCraft — Fri, 12 Nov 2010 20:58:55 +0000

How do I view PHP mail() errors? How do I see php mail() error log file under UNIX or Linux?

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WordPress Install Memcached Object Cache Plugin To Speed Up Blog

nixCraft — Mon, 13 Sep 2010 09:32:59 +0000

How do I install memcached cache plugin under UNIX / Linux to speed up my dynamic database-driven wordpress blog by caching data and objects in RAM to reduce the number of times an external data source must be read?

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PHP Increase Upload File Size Limit

nixCraft — Fri, 11 Jun 2010 12:06:23 +0000

How do I increase upload file limit from 2MB to 10MB under Apache 2 UNIX / Linux web server?

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PHP Security: Limit Resources Used By Script

nixCraft — Sun, 07 Feb 2010 18:01:12 +0000

How do I control and put limits on php scripts such as maximum execution time of each script and upload file size?

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RHEL / CentOS Xcache: /usr/include/php/ext/date/lib/timelib_structs.h:24:28: error: timelib_config.h: No such file or directory Error and Soultion

nixCraft — Thu, 24 Dec 2009 15:43:53 +0000

I'm trying to configure and install xcache under CentOS / Redhat enterprise Linux v5.4 and getting the following error:

/usr/include/php/ext/date/lib/timelib_structs.h:24:28: error: timelib_config.h: No such file or directory

How do I fix this problem and install xcache?

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PHP Fatal error: Allowed Memory Size of 20971520 Bytes exhausted (tried to allocate 131072 bytes) Error and Solution

nixCraft — Mon, 23 Nov 2009 12:31:29 +0000

I've brand new Ubuntu Linux server (Apache + PHP5 FastCGI + Lighttpd image only server) installed for my wordpress, mediawiki and vBullietin software. I can load forntpage but user cannot edit any wiki pages or post anything and I get the following error in log file:

PHP Fatal error: Allowed Memory Size of 20971520 Bytes exhausted (tried to allocate 131072 bytes) in /usr/share/mediawiki/includes/OutputHandler.php on line 81

How do I fix this problem?

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PHP Add Captcha Protection To Web Forms

nixCraft — Wed, 24 Jun 2009 09:37:59 +0000

I own a small business website. However, bots started to abusing my forms such as contact.php. How do I stop bots bots from abusing my site? How do I tell if PHP form is submitted by a person or a script?

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Explain: php_self or $_SERVER['PHP_SELF'] Usage

nixCraft — Wed, 18 Mar 2009 21:11:54 +0000

Can you explain usage of predefined variables called $_SERVER['PHP_SELF']?

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