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<h1>Examples</h1>
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The following examples shows just the evaluation of form data.
<div class="example" id="example-3481">
<p><strong>Example #1 Evaluating a FDF document</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">// Open fdf from input string provided by the extension<br />// The pdf form contained several input text fields with the names<br />// volume, date, comment, publisher, preparer, and two checkboxes<br />// show_publisher and show_preparer.<br /></span><span style="color: #0000BB">$fdf </span><span style="color: #007700">= </span><span style="color: #0000BB">fdf_open_string</span><span style="color: #007700">(</span><span style="color: #0000BB">$HTTP_FDF_DATA</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$volume </span><span style="color: #007700">= </span><span style="color: #0000BB">fdf_get_value</span><span style="color: #007700">(</span><span style="color: #0000BB">$fdf</span><span style="color: #007700">, </span><span style="color: #DD0000">"volume"</span><span style="color: #007700">);<br />echo </span><span style="color: #DD0000">"The volume field has the value '<b></span><span style="color: #0000BB">$volume</span><span style="color: #DD0000"></b>'<br />"</span><span style="color: #007700">;<br /><br /></span><span style="color: #0000BB">$date </span><span style="color: #007700">= </span><span style="color: #0000BB">fdf_get_value</span><span style="color: #007700">(</span><span style="color: #0000BB">$fdf</span><span style="color: #007700">, </span><span style="color: #DD0000">"date"</span><span style="color: #007700">);<br />echo </span><span style="color: #DD0000">"The date field has the value '<b></span><span style="color: #0000BB">$date</span><span style="color: #DD0000"></b>'<br />"</span><span style="color: #007700">;<br /><br /></span><span style="color: #0000BB">$comment </span><span style="color: #007700">= </span><span style="color: #0000BB">fdf_get_value</span><span style="color: #007700">(</span><span style="color: #0000BB">$fdf</span><span style="color: #007700">, </span><span style="color: #DD0000">"comment"</span><span style="color: #007700">);<br />echo </span><span style="color: #DD0000">"The comment field has the value '<b></span><span style="color: #0000BB">$comment</span><span style="color: #DD0000"></b>'<br />"</span><span style="color: #007700">;<br /><br />if (</span><span style="color: #0000BB">fdf_get_value</span><span style="color: #007700">(</span><span style="color: #0000BB">$fdf</span><span style="color: #007700">, </span><span style="color: #DD0000">"show_publisher"</span><span style="color: #007700">) == </span><span style="color: #DD0000">"On"</span><span style="color: #007700">) {<br /> </span><span style="color: #0000BB">$publisher </span><span style="color: #007700">= </span><span style="color: #0000BB">fdf_get_value</span><span style="color: #007700">(</span><span style="color: #0000BB">$fdf</span><span style="color: #007700">, </span><span style="color: #DD0000">"publisher"</span><span style="color: #007700">);<br /> echo </span><span style="color: #DD0000">"The publisher field has the value '<b></span><span style="color: #0000BB">$publisher</span><span style="color: #DD0000"></b>'<br />"</span><span style="color: #007700">;<br />} else<br /> echo </span><span style="color: #DD0000">"Publisher shall not be shown.<br />"</span><span style="color: #007700">;<br /><br />if (</span><span style="color: #0000BB">fdf_get_value</span><span style="color: #007700">(</span><span style="color: #0000BB">$fdf</span><span style="color: #007700">, </span><span style="color: #DD0000">"show_preparer"</span><span style="color: #007700">) == </span><span style="color: #DD0000">"On"</span><span style="color: #007700">) {<br /> </span><span style="color: #0000BB">$preparer </span><span style="color: #007700">= </span><span style="color: #0000BB">fdf_get_value</span><span style="color: #007700">(</span><span style="color: #0000BB">$fdf</span><span style="color: #007700">, </span><span style="color: #DD0000">"preparer"</span><span style="color: #007700">);<br /> echo </span><span style="color: #DD0000">"The preparer field has the value '<b></span><span style="color: #0000BB">$preparer</span><span style="color: #DD0000"></b>'<br />"</span><span style="color: #007700">;<br />} else<br /> echo </span><span style="color: #DD0000">"Preparer shall not be shown.<br />"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">fdf_close</span><span style="color: #007700">(</span><span style="color: #0000BB">$fdf</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?></span>
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</code></div>
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