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<?php $msg = 'Your phone number 040783248898 has been sent with a verification code.'; echo preg_replace('/\b\d{8}(?=\d{4}\b)/', '********', $msg);
Output for 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
Your phone number ********8898 has been sent with a verification code.
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80.43 ms | 980 KiB | 4 Q