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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

memory_get_usage() doesn't exist. Closest matches:

memory_get_usage
memory_get_peak_usage
memory_reset_peak_usage
getrusage
error_get_last
mcrypt_get_iv_size
ob_get_flush
ps_open_memory_image
ob_get_status
msg_get_queue
commonmark_node_image
mcrypt_get_block_size
imap_get_quota
fpm_get_status
mcrypt_enc_get_iv_size
eio_get_last_error
mcrypt_get_key_size
proc_get_status
xmlrpc_get_type
uopz_get_static
mb_language
shm_get_var
sem_get
mdecrypt_generic
msg_remove_queue
solr_get_version
eio_set_max_idle
fann_get_mse
mqseries_get
ps_get_value

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