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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

ssl2_tunnel doesn't exist. Closest matches:

ssh2_tunnel
ssh2_auth_none
ssh2_connect
ssh2_sftp_unlink
ssh2_shell
swoole_channel
ssh2_disconnect
ftp_ssl_connect
rrd_tune
openssl_seal
session_unset
ssh2_sftp
sqlsrv_cancel
ssh2_exec
snmp2_getnext
mysql_connect
ssh2_poll
ssh2_sftp_realpath
ssh2_sftp_readlink
mysql_pconnect
pg_lo_truncate
mysqli_connect
sqlsrv_connect
pg_lo_tell
class_uses
is_tainted
ps_new
is_nan
system
openssl_csr_new

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