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<h2 class="title">Basic usage</h2>
<p class="para">
<div class="example" id="example-877">
<p><strong>Example #1 DBA example</strong></p>
<div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB"><?php<br /><br />$id </span><span style="color: #007700">= </span><span style="color: #0000BB">dba_open</span><span style="color: #007700">(</span><span style="color: #DD0000">"/tmp/test.db"</span><span style="color: #007700">, </span><span style="color: #DD0000">"n"</span><span style="color: #007700">, </span><span style="color: #DD0000">"db2"</span><span style="color: #007700">);<br /><br />if (!</span><span style="color: #0000BB">$id</span><span style="color: #007700">) {<br /> echo </span><span style="color: #DD0000">"dba_open failed\n"</span><span style="color: #007700">;<br /> exit;<br />}<br /><br /></span><span style="color: #0000BB">dba_replace</span><span style="color: #007700">(</span><span style="color: #DD0000">"key"</span><span style="color: #007700">, </span><span style="color: #DD0000">"This is an example!"</span><span style="color: #007700">, </span><span style="color: #0000BB">$id</span><span style="color: #007700">);<br /><br />if (</span><span style="color: #0000BB">dba_exists</span><span style="color: #007700">(</span><span style="color: #DD0000">"key"</span><span style="color: #007700">, </span><span style="color: #0000BB">$id</span><span style="color: #007700">)) {<br /> echo </span><span style="color: #0000BB">dba_fetch</span><span style="color: #007700">(</span><span style="color: #DD0000">"key"</span><span style="color: #007700">, </span><span style="color: #0000BB">$id</span><span style="color: #007700">);<br /> </span><span style="color: #0000BB">dba_delete</span><span style="color: #007700">(</span><span style="color: #DD0000">"key"</span><span style="color: #007700">, </span><span style="color: #0000BB">$id</span><span style="color: #007700">);<br />}<br /><br /></span><span style="color: #0000BB">dba_close</span><span style="color: #007700">(</span><span style="color: #0000BB">$id</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?></span>
</span>
</code></div>
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<p class="para">
DBA is binary safe and does not have any arbitrary limits.
However, it inherits all limits set by the underlying
database implementation.
</p>
<p class="para">
All file-based databases must provide a way of setting the file
mode of a new created database, if that is possible at all. The
file mode is commonly passed as the fourth argument to
<span class="function"><a href="function.dba-open.html" class="function">dba_open()</a></span> or <span class="function"><a href="function.dba-popen.html" class="function">dba_popen()</a></span>.
</p>
<p class="para">
You can access all entries of a database in a linear way by using the
<span class="function"><a href="function.dba-firstkey.html" class="function">dba_firstkey()</a></span> and <span class="function"><a href="function.dba-nextkey.html" class="function">dba_nextkey()</a></span>
functions. You may not change the database while traversing it.
</p>
<p class="para">
<div class="example" id="example-878">
<p><strong>Example #2 Traversing a database</strong></p>
<div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB"><?php<br /><br /></span><span style="color: #FF8000">// ...open database...<br /><br /></span><span style="color: #0000BB">$key </span><span style="color: #007700">= </span><span style="color: #0000BB">dba_firstkey</span><span style="color: #007700">(</span><span style="color: #0000BB">$id</span><span style="color: #007700">);<br /><br />while (</span><span style="color: #0000BB">$key </span><span style="color: #007700">!= </span><span style="color: #0000BB">false</span><span style="color: #007700">) {<br /> if (</span><span style="color: #0000BB">true</span><span style="color: #007700">) { </span><span style="color: #FF8000">// remember the key to perform some action later<br /> </span><span style="color: #0000BB">$handle_later</span><span style="color: #007700">[] = </span><span style="color: #0000BB">$key</span><span style="color: #007700">;<br /> }<br /> </span><span style="color: #0000BB">$key </span><span style="color: #007700">= </span><span style="color: #0000BB">dba_nextkey</span><span style="color: #007700">(</span><span style="color: #0000BB">$id</span><span style="color: #007700">);<br />}<br /><br />foreach (</span><span style="color: #0000BB">$handle_later </span><span style="color: #007700">as </span><span style="color: #0000BB">$val</span><span style="color: #007700">) {<br /> </span><span style="color: #0000BB">dba_delete</span><span style="color: #007700">(</span><span style="color: #0000BB">$val</span><span style="color: #007700">, </span><span style="color: #0000BB">$id</span><span style="color: #007700">);<br />}<br /><br /></span><span style="color: #0000BB">?></span>
</span>
</code></div>
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