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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-www.php.net/types.boolean doesn't exist. Closest matches:

variant_set_type
http_get_last_response_headers
eventhttpconnection
grapheme_strlen
stats_stat_percentile
imagegetinterpolation
fann_get_network_type
imagetypes
variant_get_type
image_type_to_extension
win32_get_last_control_message
mongodb_bson_persistable
rnp_dump_packets_to_json
stats_absolute_deviation
html_entity_decode
hash_update_stream
swoole_async
curlsharepersistenthandle
stats_harmonic_mean
intl_get_error_code
settype
gettype
curl_share_init_persistent
returntypewillchange
bindtextdomain
ftp_set_option
zip_entry_open
swoole_channel
ps_setpolydash
zip_entry_compressionmethod

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