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<?php var_dump(strlen('user_')); var_dump(mb_strlen('user_')); var_dump(substr('user_', 0, 2)); var_dump(mb_substr('user_', 0, 2)); var_dump(substr('user_', 2)); var_dump(mb_substr('user_', 2)); var_dump(strlen('Лорем')); var_dump(mb_strlen('Лорем')); var_dump(substr('Лорем', 0, 2)); var_dump(mb_substr('Лорем', 0, 2)); var_dump(substr('Лорем', 2)); var_dump(mb_substr('Лорем', 2)); echo 'This breaks your database because of the invalid char:' . "\n"; var_dump(substr('Лорем', 3)); var_dump(mb_substr('Лорем', 3));
Output for git.master, git.master_jit, rfc.property-hooks
int(5) int(5) string(2) "us" string(2) "us" string(3) "er_" string(3) "er_" int(10) int(5) string(2) "Л" string(4) "Ло" string(8) "орем" string(6) "рем" This breaks your database because of the invalid char: string(7) "�рем" string(4) "ем"

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