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<title>Returns current seek position a of large object</title>
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</div><hr /><div id="function.pg-lo-tell" class="refentry">
<div class="refnamediv">
<h1 class="refname">pg_lo_tell</h1>
<p class="verinfo">(PHP 4 >= 4.2.0, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">pg_lo_tell</span> — <span class="dc-title">
Returns current seek position a of large object
</span></p>
</div>
<div class="refsect1 description" id="refsect1-function.pg-lo-tell-description">
<h3 class="title">Description</h3>
<div class="methodsynopsis dc-description">
<span class="type">int</span> <span class="methodname"><strong>pg_lo_tell</strong></span>
( <span class="methodparam"><span class="type">resource</span> <code class="parameter">$large_object</code></span>
)</div>
<p class="para rdfs-comment">
<span class="function"><strong>pg_lo_tell()</strong></span> returns the current position (offset
from the beginning) of a large object.
</p>
<p class="para">
To use the large object interface, it is necessary to
enclose it within a transaction block.
</p>
</div>
<div class="refsect1 parameters" id="refsect1-function.pg-lo-tell-parameters">
<h3 class="title">Parameters</h3>
<p class="para">
<dl>
<dt>
<code class="parameter">large_object</code></dt>
<dd>
<p class="para">
PostgreSQL large object (LOB) resource, returned by <span class="function"><a href="function.pg-lo-open.html" class="function">pg_lo_open()</a></span>.
</p>
</dd>
</dl>
</p>
</div>
<div class="refsect1 returnvalues" id="refsect1-function.pg-lo-tell-returnvalues">
<h3 class="title">Return Values</h3>
<p class="para">
The current seek offset (in number of bytes) from the beginning of the large
object. If there is an error, the return value is negative.
</p>
</div>
<div class="refsect1 examples" id="refsect1-function.pg-lo-tell-examples">
<h3 class="title">Examples</h3>
<p class="para">
<div class="example" id="example-2575">
<p><strong>Example #1 <span class="function"><strong>pg_lo_tell()</strong></span> example</strong></p>
<div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB"><?php<br /> $doc_oid </span><span style="color: #007700">= </span><span style="color: #0000BB">189762345</span><span style="color: #007700">;<br /> </span><span style="color: #0000BB">$database </span><span style="color: #007700">= </span><span style="color: #0000BB">pg_connect</span><span style="color: #007700">(</span><span style="color: #DD0000">"dbname=jacarta"</span><span style="color: #007700">);<br /> </span><span style="color: #0000BB">pg_query</span><span style="color: #007700">(</span><span style="color: #0000BB">$database</span><span style="color: #007700">, </span><span style="color: #DD0000">"begin"</span><span style="color: #007700">);<br /> </span><span style="color: #0000BB">$handle </span><span style="color: #007700">= </span><span style="color: #0000BB">pg_lo_open</span><span style="color: #007700">(</span><span style="color: #0000BB">$database</span><span style="color: #007700">, </span><span style="color: #0000BB">$doc_oid</span><span style="color: #007700">, </span><span style="color: #DD0000">"r"</span><span style="color: #007700">);<br /> </span><span style="color: #FF8000">// Skip first 50000 bytes<br /> </span><span style="color: #0000BB">pg_lo_seek</span><span style="color: #007700">(</span><span style="color: #0000BB">$handle</span><span style="color: #007700">, </span><span style="color: #0000BB">50000</span><span style="color: #007700">, </span><span style="color: #0000BB">PGSQL_SEEK_SET</span><span style="color: #007700">);<br /> </span><span style="color: #FF8000">// See how far we've skipped<br /> </span><span style="color: #0000BB">$offset </span><span style="color: #007700">= </span><span style="color: #0000BB">pg_lo_tell</span><span style="color: #007700">(</span><span style="color: #0000BB">$handle</span><span style="color: #007700">);<br /> echo </span><span style="color: #DD0000">"Seek position is: </span><span style="color: #0000BB">$offset</span><span style="color: #DD0000">"</span><span style="color: #007700">;<br /> </span><span style="color: #0000BB">pg_query</span><span style="color: #007700">(</span><span style="color: #0000BB">$database</span><span style="color: #007700">, </span><span style="color: #DD0000">"commit"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?></span>
</span>
</code></div>
</div>
<div class="example-contents"><p>The above example will output:</p></div>
<div class="example-contents screen">
<div class="cdata"><pre>
Seek position is: 50000
</pre></div>
</div>
</div>
</p>
</div>
<div class="refsect1 changelog" id="refsect1-function.pg-lo-tell-changelog">
<h3 class="title">Changelog</h3>
<p class="para">
<table class="doctable informaltable">
<thead>
<tr>
<th>Version</th>
<th>Description</th>
</tr>
</thead>
<tbody class="tbody">
<tr>
<td>5.6.0</td>
<td>
Added PostgreSQL 9.3's 64bit large object support. Both client and server must
support PostgreSQL 9.3 and PHP must be 64bit build to use 64bit large object.
</td>
</tr>
</tbody>
</table>
</p>
</div>
<div class="refsect1 seealso" id="refsect1-function.pg-lo-tell-seealso">
<h3 class="title">See Also</h3>
<p class="para">
<ul class="simplelist">
<li class="member"><span class="function"><a href="function.pg-lo-seek.html" class="function" rel="rdfs-seeAlso">pg_lo_seek()</a> - Seeks position within a large object</span></li>
</ul>
</p>
</div>
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