Note that this changes the return value in an array where every element is an array consisting of the matched string at offset 0 and it 's string offset into subject at offset 1.
If this flag is set, for every occuring match the appendant string offset will also be returned. Note that this changes the return value in an array where every element is an array consisting of the matched string at offset 0 and it's string offset into subject at offset 1. This flag is available since PHP 4.3.0.