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<title>Returns the number of fields in a result</title>
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<h1 class="refname">pg_num_fields</h1>
<p class="verinfo">(PHP 4 >= 4.2.0, PHP 5)</p><p class="refpurpose"><span class="refname">pg_num_fields</span> — <span class="dc-title">Returns the number of fields in a result</span></p>
</div>
<div class="refsect1 description" id="refsect1-function.pg-num-fields-description">
<h3 class="title">Description</h3>
<div class="methodsynopsis dc-description">
<span class="type">int</span> <span class="methodname"><strong>pg_num_fields</strong></span>
( <span class="methodparam"><span class="type">resource</span> <code class="parameter">$result</code></span>
)</div>
<p class="para rdfs-comment">
<span class="function"><strong>pg_num_fields()</strong></span> returns the number of fields
(columns) in a PostgreSQL result resource.
</p>
<blockquote class="note"><p><strong class="note">Note</strong>:
<p class="para">
This function used to be called <span class="function"><strong>pg_numfields()</strong></span>.
</p>
</p></blockquote>
</div>
<div class="refsect1 parameters" id="refsect1-function.pg-num-fields-parameters">
<h3 class="title">Parameters</h3>
<p class="para">
<dl>
<dt>
<span class="term"><em><code class="parameter">result</code></em></span>
<dd>
<p class="para">
PostgreSQL query result resource, returned by <span class="function"><a href="function.pg-query.html" class="function">pg_query()</a></span>,
<span class="function"><a href="function.pg-query-params.html" class="function">pg_query_params()</a></span> or <span class="function"><a href="function.pg-execute.html" class="function">pg_execute()</a></span>
(among others).
</p>
</dd>
</dt>
</dl>
</p>
</div>
<div class="refsect1 returnvalues" id="refsect1-function.pg-num-fields-returnvalues">
<h3 class="title">Return Values</h3>
<p class="para">
The number of fields (columns) in the result. On error, -1 is returned.
</p>
</div>
<div class="refsect1 examples" id="refsect1-function.pg-num-fields-examples">
<h3 class="title">Examples</h3>
<p class="para">
<div class="example" id="example-2100">
<p><strong>Example #1 <span class="function"><strong>pg_num_fields()</strong></span> example</strong></p>
<div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB"><?php<br />$result </span><span style="color: #007700">= </span><span style="color: #0000BB">pg_query</span><span style="color: #007700">(</span><span style="color: #0000BB">$conn</span><span style="color: #007700">, </span><span style="color: #DD0000">"SELECT 1, 2"</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">$num </span><span style="color: #007700">= </span><span style="color: #0000BB">pg_num_fields</span><span style="color: #007700">(</span><span style="color: #0000BB">$result</span><span style="color: #007700">);<br /><br />echo </span><span style="color: #0000BB">$num </span><span style="color: #007700">. </span><span style="color: #DD0000">" field(s) returned.\n"</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>
2 field(s) returned.
</pre></div>
</div>
</div>
</p>
</div>
<div class="refsect1 seealso" id="refsect1-function.pg-num-fields-seealso">
<h3 class="title">See Also</h3>
<p class="para">
<ul class="simplelist">
<li class="member"> <span class="function"><a href="function.pg-num-rows.html" class="function" rel="rdfs-seeAlso">pg_num_rows()</a> - Returns the number of rows in a result</span></li>
<li class="member"> <span class="function"><a href="function.pg-affected-rows.html" class="function" rel="rdfs-seeAlso">pg_affected_rows()</a> - Returns number of affected records (tuples)</span></li>
</ul>
</p>
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