{}
<?php
$mobile1 = '0101234567';
echo preg_replace('/(0(?:2|[0-9]{2}))([0-9]+)([0-9]{4}$)/', '\\1-\\2-\\3', $mobile1);
echo "\n";
$mobile2 = '01012345678';
echo preg_replace('/(0(?:2|[0-9]{2}))([0-9]+)([0-9]{4}$)/', '\\1-\\2-\\3', $mobile2);