faq.using.html

php的帮助文档,涉及到PHP的案例和基本语法,以及实际应用内容

     <p class="para">
      You can fix the problem either by unticking <i>Anonymous
      Access</i> and leaving <i>Integrated Window
      Authentication</i> ticked, or, by ticking <i>Anonymous
      Access</i> and editing the user as he may not have the access
      right. 
     </p>
    </dd>
   </dl>

   <dl>
    <dt><strong>
     <p class="para">
      My PHP script works on IE and Lynx, but on Netscape some of
      my output is missing. When I do a &quot;View Source&quot; I see the 
      content in IE but not in Netscape.
     </p>
    </strong></dt>
    <dd><a name="faq.using.netscape"></a>
     <p class="para">
      Netscape is more strict regarding HTML tags (such as tables) then 
      IE.  Running your HTML output through a HTML validator, such as 
      <a href="http://validator.w3.org/" class="link external">&raquo; validator.w3.org</a>, might 
      be helpful.  For example, a missing &lt;/table&gt; might cause this.
     </p>
     <p class="para">
      Also, both IE and Lynx ignore any NULs (<i>\0</i>) in 
      the HTML stream, Netscape does not.  The best way to check for this is 
      to compile the <a href="features.commandline.html" class="link">command line</a> version of 
      PHP (also known as the CGI version) and run your script from the
      command line.  In *nix, pipe it through <i>od -c</i> and look 
      for any <i>\0</i> characters.  If you are on Windows you need 
      to find an editor or some other program that lets you look at binary files.  
      When Netscape sees a NUL in a file it will typically not output anything 
      else on that line whereas both IE and Lynx will. 
     </p>
    </dd>
   </dl>

   <dl>
    <dt><strong>
     <p class="para">
      How am I supposed to mix XML and PHP? It complains 
      about my &lt;?xml tags!
     </p>
    </strong></dt>
    <dd><a name="faq.using.mixml"></a>
     <p class="para">
      In order to embed &lt;?xml straight into your PHP code, you&#039;ll have to turn off
      short tags by having the PHP directive 
      <a href="ini.core.html#ini.short-open-tag" class="link">short_open_tags</a> set to 
      <i>0</i>.  You cannot set this directive with <b>
      ini_set()</b>.  Regardless of <a href="ini.core.html#ini.short-open-tag" class="link">
      short_open_tags</a> being on or off, you can do something like:
      <i>&lt;?php echo &#039;&lt;?xml&#039;; ?&gt;</i>.  The default
      for this directive is on.
     </p>
    </dd>
   </dl>

   <dl>
    <dt><strong>
     <p class="para">
      How can I use PHP with FrontPage or some other HTML editor
      that insists on moving my code around?
     </p>
    </strong></dt>
    <dd><a name="faq.using.editor"></a>
     <p class="para">
      One of the easiest things to do is to enable using ASP tags in your
      PHP code. This allows you to use the ASP-style &lt;% and %&gt; code
      delimiters. Some of the popular HTML editors handle those more
      intelligently (for now). To enable the ASP-style tags, you need
      to set the <a href="ini.core.html#ini.asp-tags" class="link">asp_tags</a>
      <var class="filename">php.ini</var> variable, or use the 
      appropriate Apache directive.
     </p>
    </dd>
   </dl>

   <dl>
    <dt><strong>
     <p class="para">
      Where can I find a complete list of variables are available to me 
      in PHP?
     </p>
    </strong></dt>
    <dd><a name="faq.using.variables"></a>
     <p class="para">
      Read the manual page on <a href="language.variables.predefined.html" class="link">
      predefined variables</a> as it includes a partial list of predefined
      variables available to your script.  A complete list of available
      variables (and much more information) can be seen by calling the 
      <a href="function.phpinfo.html" class="function">phpinfo()</a> function.  Be sure to read the manual 
      section on <a href="language.variables.external.html" class="link">variables from 
      outside of PHP</a> as it describes common scenarios for 
      external variables, like from a HTML form, a Cookie, and the URL.
     </p>
     
     <blockquote><p><b class="note">Note</b>: <b>register_globals: important
note</b><br />As of PHP 4.2.0, the default value for the PHP directive
<a href="ini.core.html#ini.register-globals" class="link">register_globals</a> is <em class="emphasis">
off</em>, and it was completely removed as of PHP 6.0.0. The PHP community
discourages developers from relying on this directive, and encourages the use
of other means, such as the <a href="language.variables.predefined.html" class="link">superglobals</a>.<br /></p></blockquote>

    </dd>
   </dl>

   <dl>
    <dt><strong>
     <p class="para">
      How can I generate PDF files without using the non-free and 
      commercial libraries like 
      <a href="ref.pdf.html" class="link">PDFLib</a>?  I&#039;d like something that&#039;s 
      free and doesn&#039;t require external PDF libraries.
     </p>
    </strong></dt>
    <dd><a name="faq.using.freepdf"></a>
     <p class="para">
      There are a few alternatives written in PHP such as 
      <a href="http://www.ros.co.nz/pdf/" class="link external">&raquo; http://www.ros.co.nz/pdf/</a>, 
      <a href="http://www.fpdf.org/" class="link external">&raquo; http://www.fpdf.org/</a>, 
      <a href="http://www.gnuvox.com/pdf4php/" class="link external">&raquo; http://www.gnuvox.com/pdf4php/</a>, and 
      <a href="http://www.potentialtech.com/ppl.php" class="link external">&raquo; http://www.potentialtech.com/ppl.php</a>.
      There is also the <a href="http://www.stillhq.com/cgi-bin/getpage?area=panda" class="link external">&raquo; Panda</a> module.
     </p>
    </dd>
   </dl>

   <dl>
    <dt><strong>
     <p class="para">
      I&#039;m trying to access one of the standard CGI
      variables (such as $DOCUMENT_ROOT or $HTTP_REFERER) in a user-defined
      function, and it can&#039;t seem to find it. What&#039;s wrong?
     </p>
    </strong></dt>
    <dd><a name="faq.using.cgi-vars"></a>
     <p class="para">
      It&#039;s important to realize that the PHP directive <a href="ini.core.html#ini.register-globals" class="link">register_globals</a> also affects
      server and environment variables.  When register_globals = off (the
      default is off since PHP 4.2.0), <var class="varname">$DOCUMENT_ROOT</var>
      will not exist. Instead, use <var class="varname"><a href="reserved.variables.server.html" class="classname">$_SERVER['DOCUMENT_ROOT']
      </a></var>.  If register_globals = on then the variables
      <var class="varname">$DOCUMENT_ROOT</var> and
      <var class="varname"><a href="reserved.variables.globals.html" class="classname">$GLOBALS['DOCUMENT_ROOT']</a></var> will also exist.
     </p>
     <p class="para">
      If you&#039;re sure register_globals = on and wonder why
      <var class="varname">$DOCUMENT_ROOT</var> isn&#039;t available inside functions,
      it&#039;s because these are like any other variables and would 
      require <i>global $DOCUMENT_ROOT</i> inside the
      function.  See also the manual page on 
      <a href="language.variables.scope.html" class="link">variable scope</a>.  It&#039;s
      preferred to code with register_globals = off.
     </p>
     
     <blockquote><p><b class="note">Note</b>: <b>Superglobals: availability note
</b><br />Superglobal arrays such as <var class="varname"><a href="reserved.variables.get.html" class="classname">$_GET</a></var>,
<var class="varname"><a href="reserved.variables.post.html" class="classname">$_POST</a></var>, and <var class="varname"><a href="reserved.variables.server.html" class="classname">$_SERVER</a></var>, etc. are available
as of PHP 4.1.0. For more information, read the manual section on
<a href="language.variables.predefined.html" class="link">superglobals</a><br /></p></blockquote>

    </dd>
   </dl>

   <dl>
    <dt><strong>
     <p class="para">
      A few PHP directives may also take on shorthand byte values, as opposed
      to only <a href="language.types.integer.html" class="type integer">integer</a> byte values.  What are all the available
      shorthand byte options?  And can I use these outside of <var class="filename">php.ini</var>?
     </p>
    </strong></dt>
    <dd><a name="faq.using.shorthandbytes"></a>
     <p class="para">
      The available options are K (for Kilobytes), M (for Megabytes) and G (for
      Gigabytes; available since PHP 5.1.0), these are case insensitive.
      Anything else assumes bytes.
      <i>1M</i> equals one Megabyte or <i>1048576</i>
      bytes.  <i>1K</i> equals one Kilobyte or 
      <i>1024</i> bytes.  You may not use these shorthand 
      notations outside of <var class="filename">php.ini</var>, instead use an <a href="language.types.integer.html" class="type integer">integer</a> 
      value of bytes.  See the <a href="function.ini-get.html" class="function">ini_get()</a> documentation for
      an example on how to convert these values.
     </p>
    </dd>
   </dl>

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