Description:
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Its only a typo:

preg_match is defined as:

int preg_match ( string pattern, string subject [, array matches [, int flags [, int offset]]])

so, it will return an integer.. which is wrong:

| flags can be the following flag: 
|
| PREG_OFFSET_CAPTURE
|
| If this flag is passed, 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 .

So it can also return an Array.

|  preg_match() returns FALSE if an error occurred.

And it can return FALSE. So the "int" of the return-value must be changed to "mixed"