PHP miscellaneous functions

Function	Description
connection_aborted()	Check if the client is disconnected.
connection_status()	Return the current connection status.
connection_timeout()	Deprecated in PHP 4.0.5.
constant()	Returns a constant value.
define()	Define a constant.
defined()	Check whether a certain constant exists.
die()	Output a message and exit the current script.
eval()	Calculate the string according to PHP code.
exit()	Output a message and exit the current script.
get_browser()	Returns the performance of the user's browser.
highlight_file()	Syntax highlighting for files.
highlight_string()	Syntax highlighting for strings.
ignore_user_abort()	Set whether disconnecting from the client will terminate the execution of the script.
pack()	Load data into a binary string.
php_check_syntax()	Deprecated in PHP 5.0.5.
php_strip_whitespace()	Return the source code file with PHP comments and whitespace characters removed.
show_source()	Alias ​​for highlight_file().
sleep()	Delay code execution for a few seconds.
time_nanosleep()	Delay code execution for a number of seconds and nanoseconds.
time_sleep_until()	Delay code execution for the specified time.
uniqid()	Generate unique ID.
unpack()	Unpack data from binary string.
usleep()	Delay code execution for a few microseconds.

The above has introduced PHP miscellaneous functions, including aspects of content. I hope it will be helpful to friends who are interested in PHP tutorials.