如何获得指定索引与其后的任何字符之间的子字符串？

Question

我有一个字符串，我想从起始索引中获取子字符串，直到指定的字符出现

string = "hellome@gmail.com"
Result Needed = "lome"

Answer 1

$str = "hellomyself@gmail.com"
$substr = substr($str,3,strpos($str,'@'))
//where `@` is specified character & 3 is specified index