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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

november-https-www.php.net/empty doesn't exist. Closest matches:

mb_http_input
mb_http_output
eventhttprequest
overflowexception
swoole_http_server
eventhttpconnection
swoole_http_request
zookeepersessionexception
zookeeperauthenticationexception
domentity
xmlrpc_set_type
ps_end_template
dom_htmlelement
numberformatter
mb_ereg_search_setpos
mb_ereg_search_getpos
dom_entity
zookeeperconnectionexception
imagecreatefromgd2part
eventbufferevent
mb_ereg_search_getregs
solrillegaloperationexception
trader_set_compat
ps_begin_template
uopz_set_property
hashcontext
zookeepernonodeexception
swoole_http_client
imagecreatefromtga
zookeeperexception

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