Try it like this:
$string = substr($string, 0, 500);
$string = substr($string, 0, strrpos($string, ' '));
$string .= '... <a href="#" onclick="showAjaxModal(\'' . base_url() . 'index.php?modal/popup/readmore/' . $row['categories_id'] . '\')">... Read More</a>';
You are missing the single quotes which should wrap the url inside the showAjaxModal function.
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solved in this code i want add popup box link but showing one error inside .. help me [closed]