如何在PHP中减去字符串中的数字？

Question

There is a string variable containing number data , say $x = "OP/12/DIR"; . The position of the number data may change at any circumstance by user desire by modifying it inside the application , and the slash bar may be changed by any other character ; but the number data is mandatory. So how to extract the number data from the string ?

Answer 1

Replace everything that is NOT a number with an empty string.

  $numbers = preg_replace('/[^0-9]*/','',$x);