Description:
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While the documentation accurately tells the programmer that preg_match returns an int, the documentation does not reflect the meaning of the return value. 

As an example, in shell scripting, 0 represents true, where another number typically represents an error code. Returning 0 from a main application means everything went successfully.

Further, in some languages like C/C++, 0 is the default return value, basically meaning "Everything fine nothing to see here move along please". ;-)

The confusion comes from the fact that the preg_match() function returns 1 if a match is found and 0 otherwise.

By adding this sentence to the documentation for preg_match:

    The preg_match() function returns 1 if a match is found and 0 otherwise.

A fair bit of confusion would be cleared up by defining the non-standard meaning up front. 

Actual result:
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tt