PHP version 7.4.12 (29 Oct 2020)

Core:

• Fixed bug #80061 (Copying large files may have suboptimal performance). (cmb)
• Fixed bug #79423 (copy command is limited to size of file it can copy). (cmb)
• Fixed bug #80126 (Covariant return types failing compilation). (Nikita)
• Fixed bug #80186 (Segfault when iterating over FFI object). (Nikita)

Calendar:

• Fixed bug #80185 (jdtounix() fails after 2037). (cmb)

IMAP:

• Fixed bug #80213 (imap_mail_compose() segfaults on certain $bodies). (cmb)
• Fixed bug #80215 (imap_mail_compose() may modify by-val parameters). (cmb)
• Fixed bug #80220 (imap_mail_compose() may leak memory). (cmb)
• Fixed bug #80223 (imap_mail_compose() leaks envelope on malformed bodies). (cmb)
• Fixed bug #80216 (imap_mail_compose() does not validate types/encodings). (cmb)
• Fixed bug #80226 (imap_sort() leaks sortpgm memory). (cmb)

MySQLnd:

• Fixed bug #80115 (mysqlnd.debug doesn't recognize absolute paths with slashes). (cmb)
• Fixed bug #80107 (mysqli_query() fails for ~16 MB long query when compression is enabled). (Nikita)

ODBC:

• Fixed bug #78470 (odbc_specialcolumns() no longer accepts $nullable). (cmb)
• Fixed bug #80147 (BINARY strings may not be properly zero-terminated). (cmb)
• Fixed bug #80150 (Failure to fetch error message). (cmb)
• Fixed bug #80152 (odbc_execute() moves internal pointer of $params). (cmb)
• Fixed bug #46050 (odbc_next_result corrupts prepared resource). (cmb)

OPcache:

• Fixed bug #80083 (Optimizer pass 6 removes variables used for ibm_db2 data binding). (Nikita)
• Fixed bug #80194 (Assertion failure during block assembly of unreachable free with leading nop). (Nikita)

PCRE:

• Updated to PCRE 10.35. (cmb)
• Fixed bug #80118 (Erroneous whitespace match with JIT only). (cmb)

PDO_ODBC:

• Fixed bug #67465 (NULL Pointer dereference in odbc_handle_preparer). (cmb)

Standard:

• Fixed bug #80114 (parse_url does not accept URLs with port 0). (cmb, twosee)
• Fixed bug #76943 (Inconsistent stream_wrapper_restore() errors). (cmb)
• Fixed bug #76735 (Incorrect message in fopen on invalid mode). (cmb)

Tidy:

• Fixed bug #77040 (tidyNode::isHtml() is completely broken). (cmb)