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    <p>PHP has different syntax compared with C++. I will try to point what you are mixing. I will not check if your code works because I believe, logic is not a problem you have.</p> <p>First of all, PHP has different ways to work with scope. Inside the function AddMatrix, you are setting value for the variables with function scope. I am assuming you want to set values to class variables. So, you must refer the current object.</p> <pre><code>public function AddMatrix(Matrix2&amp; $Matrix) { $this-&gt;m_m1 + $Matrix2.$m_m1; $this-&gt;m_m2 + $Matrix2.$m_m2; $this-&gt;m_m3 + $Matrix2.$m_m3; $this-&gt;m_m4 + $Matrix2.$m_m4; return $this; } </code></pre> <p>Note I am using the operator -> to access a class Attribute instead of ".". Thats another problem in your code. The operator "." is used to concatenate string. To access class attributes or functions we use ->. So, check it out how will be your function after that:</p> <pre><code>public function AddMatrix(Matrix2&amp; $Matrix) { $this-&gt;m_m1 + $Matrix2-&gt;m_m1; $this-&gt;m_m2 + $Matrix2-&gt;m_m2; $this-&gt;m_m3 + $Matrix2-&gt;m_m3; $this-&gt;m_m4 + $Matrix2-&gt;m_m4; return $this; } </code></pre> <p>Yes, I get rid of $ character after use ->. This is correct. We use $ only for a variable. Never when accessing object attributes.</p> <p>Another mistake...PHP do not use datatype for variables. Objects are references already. So, the &amp; operator is unnecessary. So, lets finish your function:</p> <pre><code>public function AddMatrix($Matrix2) { $this-&gt;m_m1 + $Matrix2-&gt;m_m1; $this-&gt;m_m2 + $Matrix2-&gt;m_m2; $this-&gt;m_m3 + $Matrix2-&gt;m_m3; $this-&gt;m_m4 + $Matrix2-&gt;m_m4; return $this; } </code></pre>
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    1. COThankyou so much @joseareas it works like a charm now! I've spent much more time trying to get this working than I really needed too, thankyou.
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    2. COI knew you only needed syntax directions.
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    3. COYeah. I understand the logic behind it all, it's just the syntax between C++ and PHP is so similar, yet so different, it can be difficult to tell what I need to change.
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