Returns an array containing substrings of subject split along boundaries matched by pattern.
If limit is specified, then only substrings up to limit are returned, and if limit is -1, it actually means "no limit", which is useful for specifying the flags.
flags can be any combination of the following flags (combined with bitwise | operator):
If this flag is set, only non-empty pieces will be returned by preg_split().
If this flag is set, parenthesized expression in the delimiter pattern will be captured and returned as well. This flag was added for 4.0.5.
If this flag is set, for every occurring 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 its string offset into subject at offset 1. This flag is available since PHP 4.3.0 .
Example 3. Splitting a string into matches and their offsets
Note: Parameter flags was added in PHP 4 Beta 3.
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