get number in front of 'underscore' with php

Question

I have this:

15_some_text_or_numbers;

I want to get whats in front of the first underscore. There is always a letter directly after the fir

Answer 1

Simpler than a regex:

$x = '14_hello_world';
$split = explode('_', $x);
echo $split[0];

Outputs 14.