php_file.asp

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    <td>a+</td>
    <td>Read/Append. Preserves file content by writing to the end of the file</td>
  </tr>
  <tr valign="top">
    <td>x</td>
    <td>Write only. Creates a new file. Returns FALSE and an error if file 
	already exists</td>
  </tr>
  <tr valign="top">
    <td>x+</td>
    <td>Read/Write. Creates a new file. Returns FALSE and an error if file 
	already exists</td>
  </tr>
  </table>
<p><b>Note:</b> If the fopen() function is unable to open the 
specified file, it returns 0 (false).</p>
<h3>Example</h3>
<p>The following example generates a message if the fopen() function is unable 
to open the specified file:</p>
<table width="100%" border="1" class="ex" cellspacing="0"><tr><td>
<pre>&lt;html&gt;
&lt;body&gt;</pre>
<pre>&lt;?php
$file=fopen(&quot;welcome.txt&quot;,&quot;r&quot;) or exit(&quot;Unable to open file!&quot;);<br />?&gt;</pre>
<pre>&lt;/body&gt;
&lt;/html&gt;</pre>
</td></tr></table>
<br />
<hr />

<h2>Closing a File</h2>
<p>The fclose() function is used to close an open file:</p>
<table width="100%" border="1" class="ex" cellspacing="0"><tr><td>
<pre>&lt;?php
$file = fopen(&quot;test.txt&quot;,&quot;r&quot;);</pre>
<pre>//some code to be executed</pre>
<pre>fclose($file);
?&gt;</pre>
</td></tr></table>
<br />
<hr />

<h2>Check End-of-file</h2>
<p>The feof() function checks if the &quot;end-of-file&quot; (EOF) has been reached.<br />
<br />
The feof() function is useful for looping through data of unknown length.</p>
<p><b>Note:</b> You cannot read from files opened in w, a, and x mode!</p>
<table width="100%" border="1" class="ex" cellspacing="0"><tr><td>
<pre>if (feof($file)) echo &quot;End of file&quot;;</pre>
</td></tr></table>
<br />
<hr />

<h2>Reading a File Line by Line</h2>
<p>The fgets() function is used to read a single line from a file.</p>
<p><b>Note:</b> After a call to this function the file pointer has moved to the next 
line.  </p>
<h3>Example</h3>
<p>The example below reads a file line by line, until the end of 
file is reached:</p>
<table width="100%" border="1" class="ex" cellspacing="0"><tr><td>
<pre>&lt;?php
$file = fopen(&quot;welcome.txt&quot;, &quot;r&quot;) or exit(&quot;Unable to open file!&quot;);
//Output a line of the file until the end is reached
while(!feof($file))
  {
  echo fgets($file). &quot;&lt;br /&gt;&quot;;
  }
fclose($file);
?&gt;</pre>
</td></tr></table>
<br />
<hr />

<h2>Reading a File Character by Character</h2>
<p>The fgetc() function is used to read a single character from a file.</p>
<p><b>Note:</b> After a call to this function the file pointer moves to the next character.  </p>
<h3>Example</h3>
<p>The example below reads a file character by character, until the end of 
file is reached:</p>
<table width="100%" border="1" class="ex" cellspacing="0" id="table1"><tr><td>
<pre>&lt;?php
$file=fopen(&quot;welcome.txt&quot;,&quot;r&quot;) or exit(&quot;Unable to open file!&quot;);
while (!feof($file)) 
  { 
  echo fgetc($file); 
  }
fclose($file);
?&gt;</pre>
</td></tr></table>
<br />
<hr />

<h2>PHP Filesystem Reference</h2>
<p>For a full reference of the PHP filesystem functions, visit our
<a href="php_ref_filesystem.asp">PHP Filesystem Reference</a>.</p>
<hr />

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