PHP 7.3 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 7.3 is
7.3.33 which includes important security patches.
Source Code
Change Log
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core
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Fixed bug
#78875 (Long filenames cause OOM and temp files are not cleaned). (CVE-2019-11048)
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Fixed bug
#78876 (Long variables in multipart/form-data cause OOM and temp files are not cleaned). (CVE-2019-11048)
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Fixed bug
#79434 (PHP 7.3 and PHP-7.4 crash with NULL-pointer dereference on !CS constant).
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Fixed bug
#79477 (casting object into array creates references).
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Fixed bug
#79470 (PHP incompatible with 3rd party file system on demand).
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Fixed bug
#78784 (Unable to interact with files inside a VFS for Git repository).
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dom
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Fixed bug
#78221 (DOMNode::normalize() doesn't remove empty text nodes).
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fcgi
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Fixed bug
#79491 (Search for .user.ini extends up to root dir).
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mbstring
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Fixed bug
#79441 (Segfault in mb_chr() if internal encoding is unsupported).
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openssl
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Fixed bug
#79497 (stream_socket_client() throws an unknown error sometimes with <1s timeout).
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phar
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simplexml
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Fixed bug
#79528 (Different object of the same xml between 7.4.5 and 7.4.4).
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standard
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Fixed bug
#79468 (SIGSEGV when closing stream handle with a stream filter appended).