Description:
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From manual:
"If length is given and is positive, the string returned will contain at most length characters beginning from start (depending on the length of string). If string is less than or equal to start characters long, FALSE will be returned."

This bug detected in PHP versions >= 5.2.8

Results on different versions and OS:
PHP Version 5.2.5, Windows and linux: boolean: false
PHP Version 5.2.8, CentOS: string(1) "1"
PHP 5.2.8 (cli) (built: Feb  5 2009 21:21:13), MacOS: string(1) "1"
PHP Version 5.2.9, CentOS: string(1) "1"

Maby is mistake in manual and substr do not accept negative start param if string length less than start?

Reproduce code:
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var_dump( substr( '1', -2, 1 ) );

Expected result:
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boolean: false

Actual result:
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string(1) "1"