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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

calendar-https-twitter.com/official_php doesn't exist. Closest matches:

fann_create_from_file
swoole_async_writefile
intlpartsiterator
datetimeinterface
dateinterval
eventhttpconnection
ui_controls_editablecombo
appenditerator
clearstatcache
opcache_compile_file
date_interval_format
ldap_set_rebind_proc
imagecolorexactalpha
cubrid_error_code_facility
yaf_exception_routerfailed
sessionupdatetimestamphandlerinterface
stream_notification_callback
enchant_broker_set_dict_path
enchant_broker_get_dict_path
mailparse_uudecode_all
imagecolorclosestalpha
callbackfilteriterator
mongodb_driver_command
imagepalettecopy
xdiff_file_patch
win32_start_service_ctrl_dispatcher
imagepalettetotruecolor
fann_set_bit_fail_limit
get_declared_interfaces
stats_dens_pmf_binomial

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