html - php in href and iframe -

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i have found lots of on site through search option totally confused latest problem. think punctuation problem cannot find it.

i have image link change iframe, selector form radio button. link in iframe want taken php variable.

i have got whole thing working until wanted add php variable. (i got working iframe link manually entered instead of the variable.

</p><p>    <input style="position: absolute;left:-9999px;" type="radio" name="size" id="a1" />    <label for="a1">       <a href="canvas_size.php?width=32&height=22&name=test.jpg"target="iframe_a">          <img src="/site_images/a1.png" alt="a1" style="display: inline-block;cursor: pointer;padding: 3px;" alt="a1" />    </label>

the iframe points to:-

www.mydomain.com/<?php=%27$filename%27%20?>


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