Introduction to PHP Miscellaneous Functions

We classify functions that do not belong to other categories into the miscellaneous function category.

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Installation

Miscellaneous functions are an integral part of PHP core. No installation is required to use these functions.

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Runtime Configuration

The behavior of miscellaneous functions is affected by settings in the php.ini file.

Miscellaneous configuration options:

##NameDefaultDescriptionCan be changedignore_user_abort"0"FALSE Indicates that the script will be terminated whenever it attempts output after the client terminates the connection. PHP_INI_ALLhighlight.string"#DD0000" is used to highlight strings that conform to PHP syntax color. PHP_INI_ALLhighlight.comment"#FF8000"The color used to highlight PHP comments. PHP_INI_ALLhighlight.keyword"#007700"Color used for syntax highlighting of PHP keywords (such as parentheses and semicolons). PHP_INI_ALLhighlight.bg"#FFFFFF"Background color. PHP_INI_ALLhighlight.default"#0000BB"The default color for PHP syntax. PHP_INI_ALLhighlight.html"#000000"The color of the HTML code. PHP_INI_ALLbrowscapNULLThe name and location of the browser performance file (for example: browscap.ini). PHP_INI_SYSTEM

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PHP Miscellaneous Functions

PHP: Indicates the earliest PHP version that supports this function.

Function	Description	PHP
connection_aborted()	Check whether the client is disconnected.	3
connection_status()	Returns the current connection status.	3
connection_timeout()	Deprecated in PHP 4.0.5. Check if the script has timed out.	3
constant()	Returns a constant value.	4
define()	Define a constant.	3
defined()	Check whether a constant exists.	3
die()	Output a message and exit the current script.	3
eval()	Treat strings as PHP code to evaluate.	3
exit()	Output a message and exit the current script.	3
get_browser()	Returns the performance of the user's browser.	3
highlight_file()	Perform PHP syntax highlighting on files.	4
highlight_string()	Perform PHP syntax highlighting on strings.	4
ignore_user_abort()	Set whether disconnecting from the remote client will terminate the execution of the script.	3
pack()	Load data into a binary string.	3
php_check_syntax()	Deprecated in PHP 5.0.5.	5
php_strip_whitespace()	Returns the source code file with PHP comments and whitespace characters removed.	5
show_source()	Alias ​​for highlight_file().	4
sleep()	Delay code execution for a few seconds.	3
time_nanosleep()	Delay code execution for a number of seconds and nanoseconds.	5
time_sleep_until()	Delay code execution until the specified time.	5
uniqid()	Generate a unique ID.	3
unpack()	Unpack data from a binary string.	3
usleep()	Delay code execution for a number of microseconds.	3

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PHP Miscellaneous Constants

PHP: Indicates support for this constant The earliest version of PHP.

##CONNECTION_NORMAL##CONNECTION_TIMEOUT##__COMPILER_HALT_OFFSET__

Constant	Description	PHP
CONNECTION_ABORTED
	5