如何在php中添加这两个变量

我在这里添加这两个变量时出错。这是我尝试过的代码

echo "<td id='submit_button'>
         <input type='submit' value='Proceed to Pay        (Rs.".$fare+$hot_fare.")' class='submit' onClick='return validation()' />
      </td>";

但我需要两个变量的总和

proceed to pay 4323

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您需要对求和字符串中的值求和：

echo "<td id='submit_button'>
         <input type='submit' value='Proceed to Pay        (Rs.".($fare+$hot_fare).")' class='submit' onClick='return validation()' />
      </td>";

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您可以将两个变量放在单个变量中，即$total\u fare=$fare+$hot\u fare。如下

$total_fare= $fare+$hot_fare;

echo "<td id='submit_button'>
         <input type='submit' value='Proceed to Pay        (Rs.".$total_fare.")' class='submit' onClick='return validation()' />
      </td>";

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尝试value='Procedue to Pay Rs..int$fare+int$hot_fare'.@Siva，这将产生相同的错误

$total_fare= $fare+$hot_fare;

echo "<td id='submit_button'>
         <input type='submit' value='Proceed to Pay        (Rs.".$total_fare.")' class='submit' onClick='return validation()' />
      </td>";