any one can help me for error?

Please share the string you are trying JSON Parse.

thank for replay
sadad.php

SyntaxError: JSON.parse: unexpected character at line 1 column 1 of the JSON data

the error seems come from your JSON data not from the php code.

it seems that error came from the very first line of your JSON data, post it here when necessary

or use some online JSON verifier for the checkings.

https://jsonformatter.curiousconcept.com/
https://jsonlint.com/

file attached here
soap.php

<?php
$olpIdAlias='RBUAT190';
$merchantID='1039';
$refNum=rand(1, 15).rand();
$amount='200';

$xml = '<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:req="http://olp.bank.com/sappay/service/olppaymentmanager/req">
   <soapenv:Header/>
   <soapenv:Body>
      <req:initiatePaymentDetailsReq>
         <olpIdAlias>'.$olpIdAlias.'</olpIdAlias>
         <merchantId>'.$merchantID.'</merchantId>
         <merchantRefNum>'.$refNum.'</merchantRefNum>
         <paymentAmount>'.$amount.'</paymentAmount>
         <paymentCurrency>SAR</paymentCurrency>
         <dynamicMerchantLandingURL></dynamicMerchantLandingURL>
         <dynamicMerchantFailureURL></dynamicMerchantFailureURL>
      </req:initiatePaymentDetailsReq>
   </soapenv:Body>
</soapenv:Envelope>';
try{
$url = "https://b2b.rb.com/soap?service=RB_OLP_INITIATE_PAYMENT";
 $certFile =  dirname(__FILE__)."/key.pem";
  $certPass ='b2b123';
$ch = curl_init();

curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_VERBOSE, true);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);

curl_setopt($ch, CURLOPT_SSLCERT, $certFile);
curl_setopt($ch, CURLOPT_SSLCERTPASSWD, $certPass);
$headers = array();
array_push($headers, "Content-Type: text/xml; charset=utf-8");
array_push($headers, "SOAPAction: sii:RB_OLP_INITIATE_PAYMENT");
array_push($headers, "Host:b22.rb.com");

if($xml != null) {
    curl_setopt($ch, CURLOPT_POSTFIELDS, $xml);
    array_push($headers, "Content-Length: " . strlen($xml));
}

curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
$response = curl_exec($ch);
      print_r($response);
      exit;
$code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
curl_close($ch);
     print_r($response);
}  catch (Exception $e){
echo $e->getMessage();
   }


?>