After the breaking change in 7.4, be aware that count( $matches ) may be different, depending on PREG_UNMATCHED_AS_NULL flag.
With PREG_UNMATCHED_AS_NULL, count( $matches ) will always be the maximum number of subpatterns.
However, without PREG_UNMATCHED_AS_NULL the $matches array will omit any unmatched subpatterns at the tail end.
Result forthe first two out of three matches with PREG_OFFSET_CAPTURE flag only:
array (size=3)
0 =>
array (size=2)
0 => string 'may/02' (length=6)
1 => int 0
1 =>
array (size=2)
0 => string 'may' (length=3)
1 => int 0
2 =>
array (size=2)
0 => string '02' (length=2)
1 => int 4
Result for two out of three matches with additional PREG_UNMATCHED_AS_NULL flags:
array (size=4)
0 =>
array (size=2)
0 => string 'may/02' (length=6)
1 => int 0
1 =>
array (size=2)
0 => string 'may' (length=3)
1 => int 0
2 =>
array (size=2)
0 => string '02' (length=2)
1 => int 4
3 =>
array (size=2)
0 => null
1 => int -1
