[php-src] Issue #7950: preg_match fails to match zero

Issue: https://github.com/php/php-src/issues/7950 Comment Author: iluuu1994 As @KapitanOczywisty mentioned, the reason preg_match fails is because it is a string operation and implicitly coerces 0.0 to the string "0". Both "0" and "0.0" could be valid string representations of the float 0.0 but PHP can't know which one you might want and thus always does the former. The solution for you is to either: * Make the fractional part optional (as suggested in the last comment) * Convert the float to a uniform string that always has the fractional part * Calculate the parts using arithmetic operations instead of string parsing