Location: PHPKode > scripts > Simple RPN Interpreter > simple-rpn-interpreter/example.php
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<span class="style5 style1"><a href="index.html"><tt>PhpSqlAsp.com</tt></a> <tt><a href="rpn.html">RPN Interpreter (NEW)</a></tt> </span>
<h1 align="center">EXAMPLE OF<br />
   <span class="style4">RPN INTERPRETER IN PHP</span> </h1>
 <h3>(C) Arturo Gonzalez-Mata Santana </h3>
 <p>This example read and execute a RPN commands in the form. </p>
<?php 


require_once("rpn.class.php");
$s=&new RPNstack();  // pila como variable global 
//echo nl2br($_POST["textarea"]); // only for
$num_lineas=1;
$program = $_POST["textarea"] . "  ";
if ($program == "") : echo "<center><h3>please write or edit a program</h3></center>";
else :
?> 
		 <table border="1" align="center" cellpadding="2" cellspacing="1">
			  <tr bgcolor="#0066FF">
				<td colspan="2"><div align="center" class="style5"><strong>&quot;Program&quot; Line</strong></div></td>
				<td><div align="center" class="style3">Result</div></td>
			  </tr>
<?php 	
		$listado = explode("\n",$program);
		foreach ($listado as $buffer) {
			?><tr>
				<td bgcolor="#FFCC99"><div align="center" class="style5">#<?php echo $num_lineas++;?></div></td>
				<td bgcolor="#FFCC99"><span class="style7"><?php echo $buffer;?></span></td>
				<td bgcolor="#003300"><div align="right" class="style8"><strong><?php echo $s->parse_line($buffer); ?></strong></div></td>
			  </tr>
<?php 		} //foreach
endif; ?>
</table>
 <?php
if ($s->first() != "") printf("<h2>The Result is %s </h2>",$s->first());
?>
 <form name="form1" id="form1" method="post" action="">
   <table  border="1" align="center" cellpadding="0" cellspacing="2">
     <tr>
       <td width="505">
	   <textarea name="textarea" cols="80" rows="24" class="style5"><?php
	   if ($_POST["textarea"] != "") echo $_POST["textarea"]; else echo "2 12 +
8 - 9 *
5 / 78 5 + -
25 10 * 50 +
DUP *
SWAP -
23 50 < IF + * then 40 +" ;?></textarea>
</td>
       <td width="145" valign="top"><h3 align="center">
         <input type="submit" name="Submit" value="Submit" />
         <input name="Clear" type="reset" id="Clear2" value="Reset" />
       </h3>
         <table width="95%"  border="1" cellspacing="2" cellpadding="0">
           <tr>
             <th bgcolor="#003300" class="style5" scope="col"><h5 class="style8">RPN<br />
  COMMANDS </h5></th>
           </tr>
           <tr>
             <td class="style5"><span class="style9"><strong>Math Operators:</strong><br />
+ - * / </span></td>
           </tr>
           <tr>
             <td class="style5"><span class="style9"><strong>Comparison Operators:</strong><br />
  = &lt;&gt; &gt; &lt; &gt;= &lt;= </span></td>
           </tr>
           <tr>
             <td class="style5"><p class="style9"><strong>Conditionals:<br />
             </strong>IF .. THEN </p>             </td>
           </tr>
           <tr>
             <td class="style5"><p class="style9"><strong>Stack:</strong><br />
               DUP SWAP 
             </p>             </td>
           </tr>
         </table>         <p align="center" class="style5">&nbsp; </p>
       <p class="style5">&nbsp;</p><p>&nbsp;</p></td>
     </tr>
   </table>
</form>
<p>&nbsp;</p>
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