What will the jQuery syntax for new line inside php?

I am trying to find the operator in jQuery to write code in next line when jq code inside php

Here is my working code:-

<?php
    $addoldgoldrow = '    
        $(document).on("click",".add_btns",function(e) {             
             e.preventDefault();
             var markups = "<tr class=\'rowaccs\'><td><input type=\'text\' class=\'sl_no\' name=\'sl_no[]\' style=\'width: 100%\'></td><td><input type=\'text\' class=\'oweight inputbox input_table1\' name=\'oweight[]\' style=\'width: 100%\'></td><td><input type=\'text\' class=\'ostone_weight  inputbox input_table1\' name=\'ostone_weight[]\' style=\'width: 100%\'></td><td><input type=\'text\' class=\'ovd inputbox input_table1\' name=\'ovd[]\' style=\'width: 100%\'></td><td><input type=\'text\' class=\'onet_weight inputbox input_table1\' name=\'onet_weight[]\'  style=\'width: 100%\'></td><td><input type=\'text\' class=\'orate inputbox input_table1\' name=\'orate[]\' value=\'' . $metal_rate . '\' style=\'width: 100%\'></td><td><input type=\'text\' class=\'oamount inputbox input_table1 table1_end row_end\' name=\'oamount[]\'  style=\'width: 100%\' readonly></td><td><span class=\'rowcloseoldgold\'><i class=\'fa fa-times\' style=\'color: #C11429;\' aria-hidden=\'true\'></i></span></td</tr>";
        
             $("table#old_gold tbody").append(markups);
             indexassigneroldpurchase(); 
         });       
    ';

    $this->registerJs($addoldgoldrow, View::POS_READY);
?>

AND I AM TRYING TO DO LIKE THIS

<?php
    $addoldgoldrow = '    
        $(document).on("click",".add_btns",function(e) {             
            e.preventDefault();
            var markups = "<tr class=\'rowaccs\'>
                 <td><input type=\'text\' class=\'sl_no\' name=\'sl_no[]\' style=\'width: 100%\'></td>
                 <td><input type=\'text\' class=\'oweight inputbox input_table1\' name=\'oweight[]\' style=\'width: 100%\'></td>
                 <td><input type=\'text\' class=\'ostone_weight  inputbox input_table1\' name=\'ostone_weight[]\' style=\'width: 100%\'></td>
                 <td><input type=\'text\' class=\'ovd inputbox input_table1\' name=\'ovd[]\' style=\'width: 100%\'></td>
                 <td><input type=\'text\' class=\'onet_weight inputbox input_table1\' name=\'onet_weight[]\'  style=\'width: 100%\'></td>
                 <td><input type=\'text\' class=\'orate inputbox input_table1\' name=\'orate[]\' value=\'' . $metal_rate . '\' style=\'width: 100%\'></td>
                 <td><input type=\'text\' class=\'oamount inputbox input_table1 table1_end row_end\' name=\'oamount[]\'  style=\'width: 100%\' readonly></td>
                 <td><span class=\'rowcloseoldgold\'><i class=\'fa fa-times\' style=\'color: #C11429;\' aria-hidden=\'true\'></i></span></td</tr>";
                
            $("table#old_gold tbody").append(markups);
            indexassigneroldpurchase(); 
        });       
    ';

    $this->registerJs($addoldgoldrow, View::POS_READY);
?>

the + operator didn't works

I tried "+" and '+'
What operator is ideally used to connect these lines?

Simply add \ in the end of each line

So your code looks like this:

<?php
    $addoldgoldrow = '    
       $(document).on("click",".add_btns",function(e) {             
          e.preventDefault();
          var markups = "<tr class=\'rowaccs\'> \
                <td><input type=\'text\' class=\'sl_no\' name=\'sl_no[]\' style=\'width: 100%\'></td> \
                <td><input type=\'text\' class=\'oweight inputbox input_table1\' name=\'oweight[]\' style=\'width: 100%\'></td> \
                <td><input type=\'text\' class=\'ostone_weight  inputbox input_table1\' name=\'ostone_weight[]\' style=\'width: 100%\'></td> \
                <td><input type=\'text\' class=\'ovd inputbox input_table1\' name=\'ovd[]\' style=\'width: 100%\'></td> \
                <td><input type=\'text\' class=\'onet_weight inputbox input_table1\' name=\'onet_weight[]\'  style=\'width: 100%\'></td> \
                <td><input type=\'text\' class=\'orate inputbox input_table1\' name=\'orate[]\' value=\'' . $metal_rate . '\' style=\'width: 100%\'></td> \
                <td><input type=\'text\' class=\'oamount inputbox input_table1 table1_end row_end\' name=\'oamount[]\'  style=\'width: 100%\' readonly></td> \
                <td><span class=\'rowcloseoldgold\'><i class=\'fa fa-times\' style=\'color: #C11429;\' aria-hidden=\'true\'></i></span></td</tr>";
        
         $("table#old_gold tbody").append(markups);
         indexassigneroldpurchase();
      });  
   ';     
?>