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copied!<p>Assuming your input is a string with line-breaks... First process your data into an keyed array to make life easier... I've used regexes to make it more robust against formatting changes.</p> <pre><code>$eventdays="Monday = Mo Tuesday = Tu Wedneday = We Thursday = Th Friday = Fr Saturday = Sa Sunday = Su"; $lines = explode("\n", $eventdays); $data = array(); foreach ($lines as $line) { if (preg_match("/(\w+)\s*=\s*(\w+)/", $line, $match)) { $data[] = array('value'=>$match[2], 'label' => $match[1]); } } </code></pre> <p>Now just iterate over the structure printing out the keys / labels. Use the in_array function to check if the current one should be selected. Also I used checked="checked" which is the standards-compliant way of selecting checkboxes... See <a href="https://stackoverflow.com/questions/2874949/what-is-the-syntax-for-boolean-attributes-e-g-a-checked-checkbox-in-html">this question</a>.</p> <pre><code>$selected_test="Mo,We,Sa"; $select=explode(",", $selected_test); foreach ($data as $datum) { $checked=""; if (in_array($datum['value'], $select)) { $checked = " checked=\"checked\""; } echo <<< EOF <input type="checkbox" name="days[]" value="{$datum['value']}"$checked/>{$datum['label']}<br />\n EOF; } </code></pre> <p>Output</p> <pre><code><input type="checkbox" name="days[]" value="Mo" checked="checked"/>Monday<br /> <input type="checkbox" name="days[]" value="Tu"/>Tuesday<br /> <input type="checkbox" name="days[]" value="We" checked="checked"/>Wedneday<br /> <input type="checkbox" name="days[]" value="Th"/>Thursday<br /> <input type="checkbox" name="days[]" value="Fr"/>Friday<br /> <input type="checkbox" name="days[]" value="Sa" checked="checked"/>Saturday<br /> <input type="checkbox" name="days[]" value="Su"/>Sunday<br /> </code></pre>

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