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PHP 8.3.21 Released!

Getting Started: Introduction; A simple tutorial
Language Reference: Basic syntax; Types; Variables; Constants; Expressions; Operators; Control Structures; Functions; Classes and Objects; Namespaces; Enumerations; Errors; Exceptions; Fibers; Generators; Attributes; References Explained; Predefined Variables; Predefined Exceptions; Predefined Interfaces and Classes; Predefined Attributes; Context options and parameters; Supported Protocols and Wrappers

Security: Introduction; General considerations; Installed as CGI binary; Installed as an Apache module; Session Security; Filesystem Security; Database Security; Error Reporting; User Submitted Data; Hiding PHP; Keeping Current
Features: HTTP authentication with PHP; Cookies; Sessions; Handling file uploads; Using remote files; Connection handling; Persistent Database Connections; Command line usage; Garbage Collection; DTrace Dynamic Tracing

Function Reference: Affecting PHP's Behaviour; Audio Formats Manipulation; Authentication Services; Command Line Specific Extensions; Compression and Archive Extensions; Cryptography Extensions; Database Extensions; Date and Time Related Extensions; File System Related Extensions; Human Language and Character Encoding Support; Image Processing and Generation; Mail Related Extensions; Mathematical Extensions; Non-Text MIME Output; Process Control Extensions; Other Basic Extensions; Other Services; Search Engine Extensions; Server Specific Extensions; Session Extensions; Text Processing; Variable and Type Related Extensions; Web Services; Windows Only Extensions; XML Manipulation; GUI Extensions

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PHP Function List

pdo.fetch_key_pair doesn't exist. Closest matches:

pg_fetch_array
oci_fetch_array
db2_fetch_array
spoofchecker
pg_fetch_row
pdoexception
pg_fetch_all
odbc_fetch_array
imap_fetchheader
dba_key_split
oci_fetch_all
oci_fetch_row
db2_fetch_row
apcu_key_info
stream_socket_pair
date_parse
rnp_key_export
cubrid_fetch_array
pg_fetch_assoc
odbc_fetch_row
socket_create_pair
imap_fetch_overview
mcrypt_get_key_size
openssl_pkey_export
oci_fetch_assoc
pg_query_params
pg_fetch_result
fbird_fetch_row
odbc_fetch_into
db2_fetch_assoc

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