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@ 2020-06-27T05:06:33Z

<?php

$mobile = '01234567';

$zero_lead = "/^01/";
$country_code = "44";


$phone = preg_replace($zero_lead, $country_code, $mobile, -1, $count);
$accountNumber = $count ? '' : $mobile;

$post_data = array(
                'phone' => $phone,
                'accountNumber' => $accountNumber,
            );

echo json_encode($post_data);

Output
Performance
VLD
References
Branches

preg_replace: documentation ( source)
json_encode: documentation ( source)

preferences:dark modelive preview

62.45 ms | 402 KiB | 5 Q