$mb_id=substr("abcd", 0, 3);
echo("'$mb_id'");
$mb_id=substr("abcd", 2, 3);
echo("'$mb_id'");
$mb_id=substr("abcd", -1);
echo("'$mb_id'");
 
결과 'abc'  'cde'  'd' 로 나온다.
2019/03/21 13:07 2019/03/21 13:07

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