Requirements
You need to install librrd first to be able to use PECL/rrd. Most common option is using of librrd-dev package from your favourite linux distro. PECL/rrd is tested with librrd 1.4.3, older or newer versions might or might not work for you. PECL/rrd installation is tested with PHP 5.3.2 or newer.
Librrd and hence extension itself aren't mostly thread safe. There are many global and shared states in librrd. It can be dangerous use this extension in multi threaded environments like Apache2 mpm worker. If there are many parallel requests, one request can change some global librrd state of other runnig requests.
English translation
You have asked to visit this site in English. For now, only the interface is translated, but not all the content yet.If you want to help me in translations, your contribution is welcome. All you need to do is register on the site, and send me a message asking me to add you to the group of translators, which will give you the opportunity to translate the pages you want. A link at the bottom of each translated page indicates that you are the translator, and has a link to your profile.
Thank you in advance.
Document created the 30/01/2003, last modified the 26/10/2018
Source of the printed document:https://www.gaudry.be/en/php-rf-rrd.requirements.html
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References
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