http://au.php.net/manual/en/language.types.float.php
The formal definition of a literal float doesn't allow for a leading +/-:
EXPONENT_DNUM ( ({LNUM} | {DNUM}) [eE][+-]? {LNUM})
could read:
EXPONENT_DNUM [+-]? ({LNUM} | {DNUM}) [eE][+-]? {LNUM}
Cheers, Dave
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