PHP 5.1 is no longer officially supported by the PHP project.
Official support refers to that provided direct by the PHP Project.
If you install PHP via third-party packages, support timelines may be different.
Please read the Release Support Policy for more information.
The latest release of PHP 5.1 is
5.1.6.
Source Code
Change Log
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misc
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Disabled native date class to prevent pear::date conflict.
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Changed reflection constants be both PHP and class constants.
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Added an additional field $frame['object'] to the result array of debug_backtrace() that contains a reference to the respective object when the frame was called from an object.
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Fixed bug
#35423 (RecursiveDirectoryIterator doesnt appear to recurse with RecursiveFilterIterator).
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Fixed bug
#35413 (Removed -dev flag from Zend Engine version).
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Fixed bug
#35411 (Regression with \{$ handling).
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Fixed bug
#35406 (eval hangs when evall'ed code ends with comment w/o newline).
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Fixed bug
#35391 (pdo_mysql::exec does not return number of affected rows).
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Fixed bug
#35382 (Comment in end of file produces fatal error).
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Fixed bug
#35360 (exceptions in interactive mode (php -a) may cause crash).
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Fixed bug
#35358 (Incorrect error messages for PDO class constants).
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Fixed bug
#35338 (pdo_pgsql does not handle binary bound params).
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Fixed bug
#35316 (Application exception trying to create COM object).
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Fixed bug
#35170 (PHP_AUTH_DIGEST differs under Apache 1.x and 2.x).