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    copied!<p>I Don't Know About your php code logic. But This code will create a matrix as u wish , and having some basic validation. To Use in real App, Please according to your feasibility. <strong>Just Copy and paste this code to a blank file and run on localhost.</strong> </p> <pre><code>&lt;body&gt; &lt;form name="form1" action="matrixaddjs.php" method="post" onsubmit="return checkMatrix()"&gt; Enter the number of rows for matrix : &lt;input type="text" name="ar" id="ar"&gt; Enter the number of columns for matrix : &lt;input type="text" name="ac" id="ac"&gt; &lt;input type="button" name="create" value="Create Matrix" onclick="createMatrix()"&gt; &lt;div id="matrixA"&gt; &lt;/div&gt; &lt;div id="matrixB"&gt; &lt;/div&gt; &lt;input type="submit" name="submit" value="submit"&gt; &lt;script&gt; function createMatrix() { var row = document.getElementById('ar').value; var col = document.getElementById('ac').value; var i; var j; var k; var l; if (row == '') { alert('Please Enter Number Of Rows!'); return false; } if (col == '') { alert('Please Enter Number Of Columns !'); return false; } var amatrix = new Array(); var htmlA = 'Enter the A matrix :'; htmlA += '&lt;table&gt;'; for (i = 0; i &lt; row; i++) { amatrix[i] = new Array(); htmlA += '&lt;tr&gt;'; for (j = 0; j &lt; col; j++) { htmlA += '&lt;td&gt;'; htmlA += '&lt;input type="text" name="amatrix[' + i + '][' + j + ']"&gt;'; htmlA += '&lt;/td&gt;'; } htmlA += '&lt;/tr&gt;'; } htmlA += '&lt;/table&gt;'; document.getElementById('matrixA').innerHTML = htmlA; var bmatrix = new Array(); var htmlB = 'Enter the B matrix :'; htmlB += '&lt;table&gt;'; for (i = 0; i &lt; row; i++) { bmatrix[i] = new Array(); htmlB += '&lt;tr&gt;'; for (j = 0; j &lt; col; j++) { htmlB += '&lt;td&gt;'; htmlB += '&lt;input type="text" name="bmatrix[' + i + '][' + j + ']"&gt;'; htmlB += '&lt;/td&gt;'; } htmlB += '&lt;/tr&gt;'; } htmlB += '&lt;/table&gt;'; document.getElementById('matrixB').innerHTML = htmlB; } function checkMatrix() { var row = document.getElementById('ar').value; var col = document.getElementById('ac').value; if (row == '' || col == '') { alert('Please Create Matrix First!'); return false; } else { return true; } } &lt;/script&gt; &lt;/form&gt; &lt;?php if ($_POST['submit'] === 'submit') { $amatrix = $_POST['amatrix']; $bmatrix = $_POST['bmatrix']; if (!is_array($amatrix) &amp;&amp; !is_array($bmatrix)) { echo "Please Create Matrix First by Clicking on Create Matrix!"; exit; } echo "&lt;table&gt;"; echo "The resultant matrix is :"; for ($m = 0; $m &lt; $ar; $m++) { echo "&lt;tr&gt;"; for ($n = 0; $n &lt; $ac; $n++) { $cmatrix[$m][$n] = $amatrix[$m][$n] + $bmatrix[$m][$n]; echo "&lt;td&gt;"; echo $cmatrix[$m][$n]; echo "&lt;/td&gt;"; } echo "&lt;/tr&gt;"; } echo "&lt;/table&gt;"; } ?&gt; &lt;/body&gt; </code></pre> <p></p>
 

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