d72ac078
 Guillaume
Ajout graphe V1.1
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<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>Installing the library</title><link rel="stylesheet" type="text/css" href="manual.css"><meta name="generator" content="DocBook XSL Stylesheets V1.76.0"><link rel="home" href="index.html" title="JpGraph Manual"><link rel="up" href="ch03.html" title="Chapter 3. The Long Version: Installing the Library"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Installing the library</th></tr><tr><td width="20%" align="left"> </td><th width="60%" align="center">Chapter 3. The Long Version: Installing the Library</th><td width="20%" align="right"> </td></tr></table><hr></div><div class="sect1" title="Installing the library"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="sec1.installing-library"></a>Installing the library</h2></div></div></div>
<p>When you have verified the necessary preconditions as described in the previous
paragraphs it is time to install the library. The "installing" part is nothing more
than copying the files in the distribution to a place in the directory structure
where you script can find the library files. On a Unix system it is common to
install PHP libraries under "<code class="filename">/usr/share/php/</code>". On a windows
system there is really no standard path for installing PHP libraries so you have to
decide your self. </p>
<p>The important thing here is that the path to the library is included in the PHP
search path, i.e. it is in one of the paths that PHP searches when it tries to
resolve a "<code class="code">require_once</code>" or "<code class="code">include</code>" statements.
Furthermore, the included examples and demo applications (included in the pro
version) assumes that the library is installed under the directory
"<code class="filename">jpgraph/</code>".</p>
<p>As an example the following commands will install a specific version of the
library on a Unix server. If we assume that you have downloaded the library to the
"<code class="filename">/tmp/</code>" directory and are already standing in this
directory the following commands will setup the library to be used</p>
<p>
</p><pre class="screen">root:/tmp> tar xzf jpgraph-2.5.tar.gz
root:/tmp> cp -r jpgraph-2.5 /usr/shar/php/
root:/tmp> ln -s /usr/shar/php/jpgraph-2.5 /usr/shar/php/jpgraph</pre><p>
</p>
<p>The last line makes a symbolic link from "jpgraph" to the actual version of the
library. This way you can try out different versions of the library without having
to make any changes in your scripts. You just point out a different version of the
library in the symbolic link.</p>
<div class="sect2" title="Configuring JpGraph/PHP on a development server"><div class="titlepage"><div><div><h3 class="title"><a name="sec2.config-dev-server"></a>Configuring JpGraph/PHP on a development server</h3></div></div></div>
<div class="sect3" title="Setting up your php.ini file"><div class="titlepage"><div><div><h4 class="title"><a name="sec3.setting-up-php-ini"></a>Setting up your php.ini file</h4></div></div></div>
<p>
</p><div class="tip" title="Tip" style="margin-left: 0.5in; margin-right: 0.5in;"><h3 class="title">Tip</h3>
<p>To find the location of your <code class="filename">php.ini</code> file
create and run a script with the single line <code class="code"><?php
phpinfo(); ?></code> . The look at the output for a line saying
"php.ini file used" and you will see which
<code class="filename">php.ini</code> file is used.</p>
</div><p>
</p>
<p><span class="bold"><strong>Setting the memory limits</strong></span></p>
<p>In many default configuration the allowed memory for PHP is not enough for
complex graph script since they (as many other image manipulation programs)
can require a lot of memory. On a development server there should be at
least 32MB memory allowed for the HTTP/PHP process. To verify this do the
following</p>
<p>
</p><div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem">
<p>Open <code class="filename">php.ini</code> for editing.</p>
</li><li class="listitem">
<p>Locate the line saying</p>
<p><code class="code">memory_limit = xx</code></p>
<p>where "xx" is some number. Now make sure that you have at
least 32MB allowed by making sure the line reads</p>
<p><code class="code">memory_limit = 32M</code></p>
<p>Note that fore very large images this might not be enough.
Consider the following example.</p>
<p>Assume you need to create an 1200x1024 image in true color.
Just the plain image in itself will require 1200x1020x4 bytes,
which is roughly 4.7MB RAM during internal processing the
library can need up to three times that amount of memory so this
means that just for the image the library needs around of ~15MB
of RAM. If we then take the memory needed to load PHP as well as
the entire JpGraph library and dynamically execute and parse the
library it can easily consume another ~15MB RAM. If the image is
very complex and requires a huge number of objects to be created
(a typical example is a large Gantt chart) it might be necessary
to double the allowed memory to 64MB RAM. </p>
</li></ol></div><p>
</p>
<p></p>
<p><span class="bold"><strong>Setting maximum allowed run time</strong></span></p>
<p>By default many installations have very short maximum run time for the PHP
scripts. Common figures are 10s. For normal interactive use involving plain
text processing this is usually adequate. However, producing large and
complex images might take considerable time (as do all images processing).
For this reason the maximum time limit for PHP should be increased to a
minimum of 20s (depending on the complexity of your images as well as any
associated data processing it might be necessary to allow up to
30-40s).</p>
<p>The allowed running time is controlled by the <code class="filename">php.ini</code>
setting</p>
<p><code class="code">max_execution_time = xx</code></p>
<p>where "xx" is some number. Recommended setting is therefore </p>
<p><code class="code">max_execution_time = 30</code></p>
<p></p>
<p><span class="bold"><strong>Disabling output buffer</strong></span></p>
<p>The next part of the <code class="filename">php.ini</code> file that might need
changing is the output buffer. In short this should be disabled and we will
shortly explain why. To check this do the following</p>
<div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem">
<p>Open <code class="filename">php.ini</code> for editing</p>
</li><li class="listitem">
<p>Locate the line saying </p>
<p><code class="code">output_buffering = xx</code></p>
<p>where "xx" is some number. Make sure that this line is
commented out, i.e. it reads</p>
<p><code class="code">; output_buffering = xx</code></p>
</li></ol></div><p>This reason we want this to be commented out is that during
development we want to be able to see the potential error messages produced
by the library and having the output buffering enabled will actually prevent
this. Fully understanding why this is the case is good first step into the
added complexity of producing images with PHP compared with just outputting
text. Understanding this requires us to understand a few basic principles
about the HTTP protocol. Especially how MIME encodings of data works.</p>
<p>The following explanation is slightly simplified since a full description
of the HTTP protocol would bring us a bit to far in this manual</p>
<div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem">
<p>A client (e.g. browser) requests data from the server by
issuing a GET (or possible a POST) command to the server. This
is what happens when you enter a URI i the address bar in the
browser.</p>
</li><li class="listitem">
<p>The server replies with a data stream (or an error if the
requested data wasn't available). This data stream is prepended
with header (MIME header) that tells the client (e.g. the
browser) how to interpret the data that follows. The most common
type (and the default type if no header is sent by a faulty
server) is "text/html" . This tells the client to interpret the
data as plain text with embedded HTML encoding. </p>
<p>When the data is to be interpreted as an image the header will
instead be one of the image headers, for example
<code class="code">"image/png"</code> or <code class="code">"image/jpeg"</code>. When
the client receives this header it will Interpret all the
following data as an image encoded in the indicated format. </p>
<p>The important thing to keep in mind here is that each server
reply can have one and only one MIME type. This is the key to
further understanding the specific issues with dynamic image
generation. This explains why if a PHP script running on the
server sends a header first indicating that the following data
it sends should be interpreted by the client as an image it
cannot send both image data and some text.</p>
</li></ol></div><p>We are now in a position to explain how output buffering would
make debugging more difficult.</p>
<p>Normally all output from a PHP script is sequentially, i.e. the header
must first be sent and then the data. If no header is sent or plain text is
sent without a header the client will interpret this as
<code class="code">"text/html"</code>. One purpose with "output_buffer" it to
circumvent this to allow a certain amount of output to be put in a buffer
for a while and later when some processing has determined what header should
be sent the data is prepended with the correct header and the rest of the
data is then sent. </p>
<p>What could now happen is the following (not unlikely scenario): </p>
<div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem">
<p>The scripts starts executing and the image starts to be
build.</p>
</li><li class="listitem">
<p>Your script has some minor issues which produces some warnings
from PHP. These warning does not get sent directly back to the
client (the browser) to allow you to act on these warnings
instead they will be put into the output buffer. When later the
scripts starts outputting the proper image header and the image
data it gets added to the output buffer where your previous
textual PHP warning already are stored. </p>
</li><li class="listitem">
<p>Your client now receives the header that indicates that the
following data should be interpreted as an image but since that
image data is mixed with the textual warning messages it will
fail to decode the data (since it is not proper image data) and
will typical just show the image as a square with a red-cross
(FireFox) or some message along the lines of "<span class="italic">Cannot decode image</span>". This is all
depending on how a certain client handles a corrupt
image.</p>
</li></ol></div><p>The above scenario makes it impossible to debug your script
since it will give no clue to what caused or where in your script these
warnings were generated. The way to counteract this scenario is to disable
output buffering. In this way the warning will be sent back to the client as
soon as they are generated by PHP and will allow you to act on them. </p>
<p></p>
<p><span class="bold"><strong>Enabling adequate error checking</strong></span></p>
<p>The final part of the <code class="filename">php.ini</code> file that should be
adjusted (and this is not only for the JpGraph library) is the error level.
To ensure maximum interoperability of the developed scripts they should all
run completely silent no matter what error levels are set on the server.
This means that development of all scripts should always be done with
maximum error checking enabled. The JpGraph library can safely run
completely silent even when all error checking is enabled.</p>
<p>The error checking should therefore be specified as</p>
<p><code class="code">error_reporting = E_ALL | E_STRICT</code></p>
<p>to enable the highest degree of PHP error checking</p>
<p></p>
<p>
</p><div class="tip" title="Tip" style="margin-left: 0.5in; margin-right: 0.5in;"><h3 class="title">Tip</h3>
<p>In addition to the above setting it is a good idea to also to
makes sure that the following options are set</p>
<p><code class="code">zend.ze1_compatibility_mode = Off</code></p>
<p>Zend engine 1 compatibility might cause problems with the
library</p>
<p><code class="code">implicit_flush = On</code></p>
<p>This can reduce the performance and shouldn't be used on a
production server but will make all outputs sent back to the client
as soon as possible and will aid in debugging.</p>
<p><code class="code">allow_call_time_pass_reference = Off</code></p>
<p>This is just a general good idea since call time pass references
is deprecated in PHP 5.0 and higher</p>
<p><code class="code">display_errors = On</code></p>
<p>This makes sure all error are displayed</p>
<p><code class="code">display_startup_errors = On</code></p>
<p>This makes sure that any initial errors thrown by PHP will be
reported</p>
</div><p>
</p>
<p><span class="bold"><strong>Setting default timezone</strong></span></p>
<p>Starting with PHP 5.2 a warning will now be generated unless a default
time zone is explicitly specified in <code class="filename">php.ini</code>. To set
this find the line <code class="code">date.timezone</code> in the
<code class="code">[Date]</code>section and set this to valid zone. For example to
specify GMT+1 one could specify</p>
<p><code class="code">date.timezone = Europe/Paris</code></p>
<p>Note: There should be no citation signs around the time zone.</p>
<p>
</p><div class="caution" title="Caution" style="margin-left: 0.5in; margin-right: 0.5in;"><h3 class="title">Caution</h3>
<p>In order to use the LED module (See <a class="xref" href="ch17.html#sec.led-graph-type" title="LED bill boards">LED bill boards</a>) the PHP installation must
have multi-byte strings enabled so that the function
<span class="command"><strong>mb_strlen()</strong></span> is available. This is normally
enabled at compile time for PHP by specifying the options
<code class="code">--enable-mbstring --enable-mbregex</code> when configuring
the compile options.</p>
</div><p>
</p>
<p>
</p><div class="caution" title="Caution" style="margin-left: 0.5in; margin-right: 0.5in;"><h3 class="title">Caution</h3>
<p>In order to use the PDF417 barcode module (See <a class="xref" href="ch25.html" title="Chapter 25. PDF417 (2D-Barcode)">Chapter 25. <i>PDF417 (2D-Barcode)</i></a>) it is necessary for the PHP
installation to support the function <span class="command"><strong>bcmod()</strong></span>.
This is enabled when compiling PHP by making sure that the option
<code class="code">--enable-bcmath</code> is given when configuring PHP at
compile time.</p>
</div><p>
</p>
</div>
<div class="sect3" title="Setting up your jpg-config.inc.php"><div class="titlepage"><div><div><h4 class="title"><a name="id2491276"></a>Setting up your jpg-config.inc.php</h4></div></div></div>
<p>Apart from the standard configuration described in <a class="xref" href="ch03s04.html" title="Installing and configuring Font support">Installing and configuring Font support</a> and <a class="xref" href="ch03s05.html" title="Adapting and customizing the installation">Adapting and customizing the installation</a> there is only one important
configuration that is specific for a development server and that is the
localization setting for error messages. </p>
<p>As of version 3.0.0 there are three localization options</p>
<div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem">
<p>English error messages ("en")</p>
</li><li class="listitem">
<p>German error messages ("de")</p>
</li><li class="listitem">
<p>Production error messages ("prod"). This is not really a
localization but a different set of error messages which does
not give detailed error messages but a generic message suitable
for a production server where the end user is not helped by
detailed graph script errors. Instead a generic message is shown
together with an error code that corresponds to the detailed
error. ("prod")</p>
</li></ol></div><p>In order to specify the error message localization the
following define in <code class="filename">jpg-config.inc.php</code> must be set the </p>
<p><code class="code">define('DEFAULT_ERR_LOCALE','en');</code></p>
<p>The possible options are</p>
<p>
</p><div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem">
<p>"en", English locale</p>
</li><li class="listitem">
<p>"de", German locale</p>
</li><li class="listitem">
<p>"prod", The production version of the error messages.</p>
</li></ol></div><p>
</p>
<p>
</p><div class="tip" title="Tip" style="margin-left: 0.5in; margin-right: 0.5in;"><h3 class="title">Tip</h3>
<p>In addition to specifying the locale in the
<code class="filename">jpg-config.inc.php</code> file it can also be
specified dynamically in each script by calling</p>
<p>
</p><div class="hl-main"><table class="hl-table" width="100%"><tr><td class="hl-gutter" align="right" valign="top"><pre>1
</pre></td><td class="hl-main" valign="top"><pre><span class="hl-code">JpGraphError::SetErrLocale($aLocale);</span></pre></td></tr></table></div><p>
</p>
</div><p>
</p>
</div>
</div>
<div class="sect2" title="Configuring JpGraph/PHP on a production server"><div class="titlepage"><div><div><h3 class="title"><a name="sec2.config-prod-server"></a>Configuring JpGraph/PHP on a production server</h3></div></div></div>
<div class="sect3" title="Setting up your php.ini file"><div class="titlepage"><div><div><h4 class="title"><a name="id2491419"></a>Setting up your php.ini file</h4></div></div></div>
<p>Apart from what is applicable to a development server as described in <a class="xref" href="ch03s03.html#sec2.config-dev-server" title="Configuring JpGraph/PHP on a development server">Configuring JpGraph/PHP on a development server</a> the following changes should be
considered in a production environment.</p>
<p>
<span class="bold"><strong>Setting the memory limits</strong></span>
</p>
<p>The one thing to keep in mind here is that each active connection will
spawn a unique PHP instance (HTTP process). This means that the memory limit
set per PHP process can cause a very high memory demand on a busy server
with many simultaneous connections. For this reason it is important that
during system test (before going into production) the actual needed memory
limit is determined. </p>
<p>For a busy server it is not uncommon to dimension it so it can handle 100
simultaneous connections. If the limit of r each PHP process is set to 32MB
this means that the server needs at least ~3.2GB memory just to handle the
PHP processes (if they are all using there maximum allowed memory).</p>
<p>
<span class="bold"><strong>Setting maximum allowed run time</strong></span>
</p>
<p>The same principle applies to a the allowed run time. For a production
server with high load and many simultaneous users it might be necessary to
increase the maximum allowed execution time just to be sure no process is
terminated due to it reaching its maximum allowed run time. When that
happens the PHP process will be killed an no output sent back to the client
(e.g. the browser).</p>
<p>
<span class="bold"><strong>Disabling output buffer</strong></span>
</p>
<p>The output buffer should be disabled on the production server as well
since enabling this will slow down the PHP and put a higher demand on the
memory requirements.</p>
<p>
<span class="bold"><strong>Enabling adequate error checking</strong></span>
</p>
<p>On a production server it is not a good idea to display all PHP error
messages to the end user so the display of error messages should be disabled
and the error messages should only be logged to a file.</p>
<div class="tip" title="Tip" style="margin-left: 0.5in; margin-right: 0.5in;"><h3 class="title">Tip</h3>
<p> On a production server it is also a good to idea to have the
following settings: </p>
<p>
<code class="code">display_errors = Off</code>
</p>
<p>This makes sure that now PHP errors are displayed</p>
<p>
<code class="code">display_startup_errors = Off</code>
</p>
<p>This makes sure that any initial errors thrown by PHP is not displayed
to the end user</p>
<p><code class="code">log_errors = On</code></p>
<p><code class="code">error_log = <name-of-log-file></code></p>
<p>This makes sure all server PHP errors are logged to a specified
file</p>
</div>
</div>
<div class="sect3" title="Setting up your jpg-config.inc.php"><div class="titlepage"><div><div><h4 class="title"><a name="id2491421"></a>Setting up your <code class="filename">jpg-config.inc.php</code></h4></div></div></div>
<p>On a production server it is best not to show detailed error messages to
an end user. Instead it is better to have a generic error message that
indicates a server problem and give an error code which can be decoded by
looking it up in the table in <a class="xref" href="aph.html" title="Appendix H. Error messages">Appendix H. <i>Error messages</i></a> Using a generic error message is achieved by
setting the following define:</p>
<p><code class="code">define('DEFAULT_ERR_LOCALE','prod');</code></p>
</div>
</div>
<div class="sect2" title="Adjusting PHP include path"><div class="titlepage"><div><div><h3 class="title"><a name="sec2.adjusting-php-include-path"></a>Adjusting PHP include path</h3></div></div></div>
<p>As was mentioned before the library should be installed somewhere in the PHP
include path. There are two ways of configuring the include path:</p>
<p>
</p><div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem">
<p>setting the include path in <code class="filename">php.ini</code></p>
<p><code class="code">include_path = <file-path></code></p>
</li><li class="listitem">
<p>adjusting the include path directly in the code by using the PHP
command <code class="code">php_ini_set()</code> at the top of the script</p>
</li></ol></div><p>
</p>
<p>The library examples assume that the library is available under a directory
called "<code class="filename">jpgraph/</code>" . This will allow the scripts to include
the library files by, for example, writing "<code class="code">include</code>" or
"<code class="code">require_once</code>" statements such as </p>
<p><code class="code">require_once( 'jpgraph/jpgraph.php')</code></p>
</div>
<div class="sect2" title="Using Apache2 alias configuration during development"><div class="titlepage"><div><div><h3 class="title"><a name="id2491659"></a>Using Apache2 alias configuration during development</h3></div></div></div>
<p>
</p><div class="note" title="Note" style="margin-left: 0.5in; margin-right: 0.5in;"><h3 class="title">Note</h3>
<p>This section only discusses alias setting using the Apache HTTP server
so this section can be skipped at first time reading the manual without
loss of continuation.</p>
</div><p>
</p><div class="note" title="Note" style="margin-left: 0.5in; margin-right: 0.5in;"><h3 class="title">Note</h3>
<p>More detailed information on the alias directive is also available in
the official Apache documentation at <code class="uri"><a class="uri" href="http://httpd.apache.org/docs/2.2/mod/mod_alias.html#alias" target="_top">http://httpd.apache.org/docs/2.2/mod/mod_alias.html</a></code></p>
</div><p>
</p>
<p>When accessing examples and test code through a regular bowser during
development the scripts must be available in document root (or somewhere beneath
that root) the root is traditionally named <code class="code">/htdocs</code>. Having a
development code/repository directly under this root directory is not a good
idea. For example, write access to a document root (even on a development
server) should be restricted, in addition the paths given to a test team should
be the same whatever version is currently under test so storing different
versions with different names under the root is also a poor setup.</p>
<p>A much better and easy, approach is to use the powerful concept of alias in
Apache. This is a way of mapping a URL to a specific directory on the server.
For example if <code class="uri"><a class="uri" href="http://www.eclipse.org/projects/project-plan.php?projectid=tools.pdt" target="_top">Eclipse-PDT</a></code>
is used as an IDE to develop PHP it is mandatory to have a workspace setup where
all the working files resides. Assuming that a local developer has his workspace
directly in his home directory, say <code class="filename">~joe/workspace</code>, we
could configure an alias so that the workspace is accessible by the alias
"<code class="filename">http://localhost/ws/</code>" by adding the following
configuration in the Apache setup file(s)</p>
<div class="hl-main"><table class="hl-table" width="100%"><tr><td class="hl-gutter" align="right" valign="top"><pre>1
2
3
4
5
</pre></td><td class="hl-main" valign="top"><pre><span class="hl-code">Alias /ws /home/joe/worksapce
<Directory /home/joe/workspace>
Order allow,deny
Allow from all
</Directory></span></pre></td></tr></table></div>
<p>In this particular setup we use very liberal settings, allowing basically
everyone with server access to access the directory. Using this approach makes
it very easy to use the same test setup but allow testing of different
branches/versions of the code.</p>
<p>Depending on the system these configurations can reside in different places.
However, a very common structure is to keep all these small configuration files
under <code class="filename">/etc/apache/conf.d/</code> The main Apache configuration
then reads all the files (regardless of there name) that are stored under this
directory. </p>
<p>As a final example we show a further slightly more complex example (which
actually shows how most of our developers have there systems setup for PHP5
development). This example adds options to do directory listing and allows the
server to follow symbolic links. More information on available argument for the
directive option is available in the official Apache documentation <code class="uri"><a class="uri" href="http://httpd.apache.org/docs/2.2/mod/core.html#options" target="_top">http://httpd.apache.org/docs/2.2/mod/core.html#options</a></code></p>
<p>
</p><div class="example"><a name="id2491770"></a><p class="title"><b>Example 3.5. Alias configuration for a development server running Apache with
Eclipse-PDT</b></p><div class="example-contents">
<div class="hl-main"><table class="hl-table" width="100%"><tr><td class="hl-gutter" align="right" valign="top"><pre>1
2
3
4
5
6
7
8
9
10
</pre></td><td class="hl-main" valign="top"><pre><span class="hl-code"># Configuration for Eclipse workspace
#
<IfModule mod_php5.c>
Alias /ws/ /home/joe/workspace/
<Directory /home/joe/workspace/>
Options +Indexes +Multiviews +FollowSymLinks
order allow,deny
allow from all
</Directory>
</IfModule></span></pre></td></tr></table></div>
</div></div><p><br class="example-break">
</p>
</div>
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