I have got solution by customizing some of the code:
Original code:
$areacode...

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I have got solution by customizing some of the code:
Original code:

$areacode = $localnumber = ''; // Mobile number if (preg_match('/([0]{1}[6]{1}[-\s]+[1-9]{1}[\s]*([0-9]{1}[\s]*){7})/', $phonenumber)) { preg_match('/(?<areacode>[0]{1}[6]{1})[-\s]+(?<localnumber>[1-9]{1}[\s]*([0-9]{1}[\s]*){7})/', $phonenumber, $matches); } // Phonenumber with 4 digit area code if (preg_match('/([0]{1}[1-9]{1}[0-9]{2}[-\s]+[1-9]{1}[\s]*([0-9]{1}[\s]*){5})/', $phonenumber)) { preg_match('/(?<areacode>[0]{1}[1-9]{1}[0-9]{2})[-\s]+(?<localnumber>[1-9]{1}[\s]*([0-9]{1}[\s]*){5})/', $phonenumber, $matches); } // Phonenumber with 3 digit area code if (preg_match('/([0]{1}[1-9]{1}[0-9]{1}[-\s]+[1-9]{1}[\s]*([0-9]{1}[\s]*){6})/', $phonenumber)) { preg_match('/(?<areacode>[0]{1}[1-9]{1}[0-9]{1})[-\s]+(?<localnumber>[1-9]{1}[\s]*([0-9]{1}[\s]*){6})/', $phonenumber, $matches); } $areacode = $matches[areacode]; $localnumber = preg_replace('/ /', '', $matches[localnumber]); $phonenumber = $areacode. '-'. $localnumber; // Add Country code if needed if ($field['phone_country_code']) { $areacode = preg_replace('/^0/', '', $areacode); $phonenumber = '+31-'. $areacode. '-'. $localnumber; }

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My modified code:

$areacode = $localnumber = ''; // Mobile number if (preg_match('/([0]{1}[6]{1}[-\s]+[1-9]{1}[\s]*([0-9]{1}[\s]*){7})/', $phonenumber)) { preg_match('/([0]{1}[6]{1})[-\s]+([1-9]{1}[\s]*([0-9]{1}[\s]*){7})/', $phonenumber, $matches); } // Phonenumber with 4 digit area code if (preg_match('/([0]{1}[1-9]{1}[0-9]{2}[-\s]+[1-9]{1}[\s]*([0-9]{1}[\s]*){5})/', $phonenumber)) { preg_match('/([0]{1}[1-9]{1}[0-9]{2})[-\s]+([1-9]{1}[\s]*([0-9]{1}[\s]*){5})/', $phonenumber, $matches); } // Phonenumber with 3 digit area code if (preg_match('/([0]{1}[1-9]{1}[0-9]{1}[-\s]+[1-9]{1}[\s]*([0-9]{1}[\s]*){6})/', $phonenumber)) { preg_match('/([0]{1}[1-9]{1}[0-9]{1})[-\s]+([1-9]{1}[\s]*([0-9]{1}[\s]*){6})/', $phonenumber, $matches); } $areacode = $matches[1]; $localnumber = preg_replace('/ /', '', $matches[2]); $phonenumber = $areacode. '-'. $localnumber; // Add Country code if needed if ($field['phone_country_code']) { $areacode = preg_replace('/^0/', '', $areacode); $phonenumber = '+31-'. $areacode. '-'. $localnumber; }

I have removed variables areacode and local number form the original code.
And access others using the array index

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