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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

using-https-confoo.ca/en/yul2018/register doesn't exist. Closest matches:

intlcodepointbreakiterator
session_cache_limiter
stream_filter_register
wkhtmltox_pdf_converter
sessionhandlerinterface
stomp_connect_error
eventhttpconnection
simdjson_key_exists
session_register_shutdown
stream_wrapper_unregister
pspell_config_create
spl_autoload_register
uconverter
mongodb_bson_regexinterface
recursiveregexiterator
intlbreakiterator
ui_controls_entry
pg_escape_literal
intldateformatter
stream_register_wrapper
spl_autoload_unregister
stream_wrapper_register
imagecolorallocate
simdjsonvalueerror
fann_get_connection_rate
unhandledmatcherror
wkhtmltox_image_converter
snmp_set_enum_print
socket_listen
swoole_redis_server

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