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<h1 class="refname">pg_unescape_bytea</h1>
<p class="verinfo">(PHP 4 >= 4.3.0, PHP 5)</p><p class="refpurpose"><span class="refname">pg_unescape_bytea</span> — <span class="dc-title">
Unescape binary for bytea type
</span></p>
</div>
<div class="refsect1 description" id="refsect1-function.pg-unescape-bytea-description">
<h3 class="title">Description</h3>
<div class="methodsynopsis dc-description">
<span class="type">string</span> <span class="methodname"><strong>pg_unescape_bytea</strong></span>
( <span class="methodparam"><span class="type">string</span> <code class="parameter">$data</code></span>
)</div>
<p class="para rdfs-comment">
<span class="function"><strong>pg_unescape_bytea()</strong></span> unescapes PostgreSQL bytea data
values. It returns the unescaped string, possibly containing binary data.
</p>
<blockquote class="note"><p><strong class="note">Note</strong>:
<p class="para">
When you <em>SELECT</em> a bytea type, PostgreSQL returns octal byte values
prefixed with '\' (e.g. \032). Users are supposed to convert back to
binary format manually.
</p>
<p class="para">
This function requires PostgreSQL 7.2 or later. With PostgreSQL
7.2.0 and 7.2.1, bytea values must be cast when you enable
multi-byte support. i.e. <em>INSERT INTO test_table (image)
VALUES ('$image_escaped'::bytea);</em> PostgreSQL 7.2.2 or
later does not need a cast. The exception is when the client and backend
character encoding does not match, and there may be multi-byte
stream error. User must then cast to bytea to avoid this error.
</p>
</p></blockquote>
</div>
<div class="refsect1 parameters" id="refsect1-function.pg-unescape-bytea-parameters">
<h3 class="title">Parameters</h3>
<p class="para">
<dl>
<dt>
<span class="term"><em><code class="parameter">data</code></em></span>
<dd>
<p class="para">
A <span class="type"><a href="language.types.string.html" class="type string">string</a></span> containing PostgreSQL bytea data to be converted into
a PHP binary string.
</p>
</dd>
</dt>
</dl>
</p>
</div>
<div class="refsect1 returnvalues" id="refsect1-function.pg-unescape-bytea-returnvalues">
<h3 class="title">Return Values</h3>
<p class="para">
A <span class="type"><a href="language.types.string.html" class="type string">string</a></span> containing the unescaped data.
</p>
</div>
<div class="refsect1 examples" id="refsect1-function.pg-unescape-bytea-examples">
<h3 class="title">Examples</h3>
<p class="para">
<div class="example" id="example-2126">
<p><strong>Example #1 <span class="function"><strong>pg_unescape_bytea()</strong></span> example</strong></p>
<div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB"><?php <br /> </span><span style="color: #FF8000">// Connect to the database<br /> </span><span style="color: #0000BB">$dbconn </span><span style="color: #007700">= </span><span style="color: #0000BB">pg_connect</span><span style="color: #007700">(</span><span style="color: #DD0000">'dbname=foo'</span><span style="color: #007700">);<br /> <br /> </span><span style="color: #FF8000">// Get the bytea data<br /> </span><span style="color: #0000BB">$res </span><span style="color: #007700">= </span><span style="color: #0000BB">pg_query</span><span style="color: #007700">(</span><span style="color: #DD0000">"SELECT data FROM gallery WHERE name='Pine trees'"</span><span style="color: #007700">); <br /> </span><span style="color: #0000BB">$raw </span><span style="color: #007700">= </span><span style="color: #0000BB">pg_fetch_result</span><span style="color: #007700">(</span><span style="color: #0000BB">$res</span><span style="color: #007700">, </span><span style="color: #DD0000">'data'</span><span style="color: #007700">);<br /> <br /> </span><span style="color: #FF8000">// Convert to binary and send to the browser<br /> </span><span style="color: #0000BB">header</span><span style="color: #007700">(</span><span style="color: #DD0000">'Content-type: image/jpeg'</span><span style="color: #007700">);<br /> echo </span><span style="color: #0000BB">pg_unescape_bytea</span><span style="color: #007700">(</span><span style="color: #0000BB">$raw</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?></span>
</span>
</code></div>
</div>
</div>
</p>
</div>
<div class="refsect1 changelog" id="refsect1-function.pg-unescape-bytea-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>5.5.1</td>
<td>
A warning is thrown if the input string is invalid.
</td>
</tr>
</tbody>
</table>
</p>
</div>
<div class="refsect1 seealso" id="refsect1-function.pg-unescape-bytea-seealso">
<h3 class="title">See Also</h3>
<p class="para">
<ul class="simplelist">
<li class="member"> <span class="function"><a href="function.pg-escape-bytea.html" class="function" rel="rdfs-seeAlso">pg_escape_bytea()</a> - Escape a string for insertion into a bytea field</span></li>
<li class="member"> <span class="function"><a href="function.pg-escape-string.html" class="function" rel="rdfs-seeAlso">pg_escape_string()</a> - Escape a string for query</span></li>
</ul>
</p>
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