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<?php $input = <<<EOT <tr class="row0 row-hover"> <td class="column-0 "><?php _e('Data', 'domain'); ?> </td> <td class="column-0 ">USD</td> <td class="column-0 ">EUR</td> <td class="column-0 ">GBP</td> <td class="column-0 ">CAD</td> <td class="column-0 ">CHF</td> <td class="column-0 ">HKD</td> <td class="column-0 ">AUD</td> <td class="column-0 ">SGD</td> <td class="column-0 ">SEK</td> <td class="column-0 ">NOK</td> <td class="column-0 ">CNH</td> </tr> <tr class="row0 row-hover"> <td class="column-0 "><?php _e('Data', 'domain'); ?> </td> <td class="column-0 ">USD</td> <td class="column-0 ">EUR</td> <td class="column-0 ">GBP</td> <td class="column-0 ">CAD</td> <td class="column-0 ">CHF</td> <td class="column-0 ">HKD</td> <td class="column-0 ">AUD</td> <td class="column-0 ">SGD</td> <td class="column-0 ">SEK</td> <td class="column-0 ">NOK</td> <td class="column-0 ">CNH</td> </tr> EOT; $delimiter = '</tr>'; $content = substr($input, 0, strpos($input, $delimiter) + strlen($delimiter)); $output = str_replace("<td", "<th", $content); $output .= substr($input, strpos($input, $delimiter) + strlen($delimiter)); var_dump($output);

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