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<title>Write to a large object</title>
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<h1 class="refname">pg_lo_write</h1>
<p class="verinfo">(PHP 4 >= 4.2.0, PHP 5)</p><p class="refpurpose"><span class="refname">pg_lo_write</span> — <span class="dc-title">Write to a large object</span></p>
</div>
<div class="refsect1 description" id="refsect1-function.pg-lo-write-description">
<h3 class="title">Description</h3>
<div class="methodsynopsis dc-description">
<span class="type">int</span> <span class="methodname"><strong>pg_lo_write</strong></span>
( <span class="methodparam"><span class="type">resource</span> <code class="parameter">$large_object</code></span>
, <span class="methodparam"><span class="type">string</span> <code class="parameter">$data</code></span>
[, <span class="methodparam"><span class="type">int</span> <code class="parameter">$len</code></span>
] )</div>
<p class="para rdfs-comment">
<span class="function"><strong>pg_lo_write()</strong></span> writes data into a large object
at the current seek position.
</p>
<p class="para">
To use the large object interface, it is necessary to
enclose it within a transaction block.
</p>
<blockquote class="note"><p><strong class="note">Note</strong>:
<p class="para">
This function used to be called <span class="function"><strong>pg_lowrite()</strong></span>.
</p>
</p></blockquote>
</div>
<div class="refsect1 parameters" id="refsect1-function.pg-lo-write-parameters">
<h3 class="title">Parameters</h3>
<p class="para">
<dl>
<dt>
<span class="term"><em><code class="parameter">large_object</code></em></span>
<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>
</dt>
<dt>
<span class="term"><em><code class="parameter">data</code></em></span>
<dd>
<p class="para">
The data to be written to the large object. If <em><code class="parameter">len</code></em> is
specified and is less than the length of <em><code class="parameter">data</code></em>, only
<em><code class="parameter">len</code></em> bytes will be written.
</p>
</dd>
</dt>
<dt>
<span class="term"><em><code class="parameter">len</code></em></span>
<dd>
<p class="para">
An optional maximum number of bytes to write. Must be greater than zero
and no greater than the length of <em><code class="parameter">data</code></em>. Defaults to
the length of <em><code class="parameter">data</code></em>.
</p>
</dd>
</dt>
</dl>
</p>
</div>
<div class="refsect1 returnvalues" id="refsect1-function.pg-lo-write-returnvalues">
<h3 class="title">Return Values</h3>
<p class="para">
The number of bytes written to the large object, or <strong><code>FALSE</code></strong> on error.
</p>
</div>
<div class="refsect1 examples" id="refsect1-function.pg-lo-write-examples">
<h3 class="title">Examples</h3>
<p class="para">
<div class="example" id="example-2098">
<p><strong>Example #1 <span class="function"><strong>pg_lo_write()</strong></span> example</strong></p>
<div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB"><?php<br /> $doc_oid </span><span style="color: #007700">= </span><span style="color: #0000BB">189762345</span><span style="color: #007700">;<br /> </span><span style="color: #0000BB">$data </span><span style="color: #007700">= </span><span style="color: #DD0000">"This will overwrite the start of the large object."</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">$doc_oid</span><span style="color: #007700">, </span><span style="color: #DD0000">"w"</span><span style="color: #007700">);<br /> </span><span style="color: #0000BB">$data </span><span style="color: #007700">= </span><span style="color: #0000BB">pg_lo_write</span><span style="color: #007700">(</span><span style="color: #0000BB">$handle</span><span style="color: #007700">, </span><span style="color: #0000BB">$data</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>
</p>
</div>
<div class="refsect1 seealso" id="refsect1-function.pg-lo-write-seealso">
<h3 class="title">See Also</h3>
<p class="para">
<ul class="simplelist">
<li class="member"> <span class="function"><a href="function.pg-lo-create.html" class="function" rel="rdfs-seeAlso">pg_lo_create()</a> - Create a large object</span></li>
<li class="member"> <span class="function"><a href="function.pg-lo-open.html" class="function" rel="rdfs-seeAlso">pg_lo_open()</a> - Open a large object</span></li>
</ul>
</p>
</div>
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