PHP Developer''''s Dictionary- P31 potx

Description The unserialize function, which was added in PHP 3.0.5 and PHP 4.0b4, returns the original PHP value of str before it was serialized.. assert Syntax int assert string|bool

Description

The unserialize() function, which was added in PHP 3.0.5 and PHP 4.0b4, returns the original PHP value of str before it was serialized The value can be an integer,

double, string, array, or object An object's methods cannot be serialized, only its properties

usleep()

Syntax

void usleep(int micro_seconds)

Description

The usleep() function causes script processing to pause for the number of microseconds specified by micro_seconds

PHP Options and Information

PHP provides the functions that enable you to examine information about the current version of PHP that is running, along with information from the operating system about the PHP process Additionally, it allows scripts to interact with the operating system environment

assert()

Syntax

int assert (string|bool assertion)

Description

The assert() function, which was added in PHP 4.0b4, examines the given

assertion and takes action if the result is false If the parameter is a string, it will

be executed Assertions should be used only as a debugging feature, and not used for normal runtime operations

assert_options()

Syntax

int assert_options (int what [,mixed value)

Description

The assert_options() function , which was added in PHP 4.0b4, enables you both

to examine and set the assertion options The following options are available:

Option ini Setting Default Description

ASSERT_ACTIVE assert.active 1 assert() is on

ASSERT_WARNING assert.warning 1 Issues a warning for each

failure ASSERT_BAIL assert.bail 0 Terminates execution if

assertion fails ASSERT_QUIET_EVAL assert.quiet_eval 0 Disables error reporting

during assertion evaluation ASSERT_CALLBACK assert_callback (null)Calls a user function on

failed assertions

error_log()

Syntax

int error_log(string message, int message_type, string [destination] , string [extra_headers] )

Description

The error_log() function can send a message to a Web server's error log, a TCP port, or to a file The message parameter represents the information that should be

logged The message_type parameter indicates where the message should be

directed and has four possible values:

0—message is sent to PHP's system logger, which is determined by the

setting of the error_log configuration option

1— message is sent via email to the address denoted by the

destination parameter The parameter extra_headers is used with

this option as well The option behaves similar to mail()

2— message is sent through the PHP debugging connection This is

possible only when remote debugging is enabled For this option,

destination indicates the host and port of the connection listening for

debugging information

3— message is written to the end of the file specified by destination

Syntax

int error_reporting(int [level] )

Description

The error_reporting() function sets the PHP error-reporting level and returns the previous setting The parameter level is an additive bitmask made up of the

following codes:

16 E_CORE_ERROR

32 E_CORE_WARNING

There also exists an E_ALL name, which is equal to 15 (1 + 2 + 4 + 8) Multiple levels are indicated by adding the values together For example, to indicate warnings and error messages, specify level 3

extension_loaded()

Syntax

bool extension_loaded(string name)

Description

The extension_loaded() function, which was added in PHP 3.0.10 and PHP 4.0b4, returns true if the PHP extension called name is loaded

getenv()

Syntax

string getenv(string varname)

Description

The getenv() function returns the value of the environment variable specified by

varname , and false if the environment variable doesn't exist

get_cfg_var()

Syntax

string get_cgf_var(string varname)

Description

The get_cfg_var() function returns the current value of varname , which is the

name of a PHP configuration variable If this variable doesn't exist, false is returned The function doesn't read compile time settings or variables set from the Apache configuration file To verify that PHP is utilizing a configuration file, check the return value of the cfg_file_path configuration setting If this value exists, a configuration file is being used

get_current_user()

Syntax

string get_current_user(void)

Description

The get_current_user() function returns the name of the owner of the current PHP script

get_magic_quotes_gpc()

Syntax

long get_magic_quotes_gpc(void)

Description

The get_magic_quotes_gpc() function, which was added in PHP 3.0.6 and PHP 4.0, returns the current active configuration setting of magic_quotes_gpc (0 for off, 1 for

(double quotes), \\ (backslashes), and NULs are automatically escaped with a backslash

get_magic_quotes_runtime()

Syntax

long get_magic_quotes_runtime(void)

Description

The get_magic_quotes_runtime() function, which was added in PHP 3.0.6 and PHP 4.0, returns the current active configuration setting of magic_quotes_runtime (0 for off, 1 for on) GPC stands for Get/Post/Cookie, and is used to escape quotes in strings that are returned from function calls When magic_quotes_runtime is active, all '(single quotes), (double quotes), \\ (backslashes), and NULs are escaped with a backslash automatically

getlastmod()

Syntax

int getlastmod(void)

Description

The getlastmod() function returns the UNIX timestamp indicating the last change of the currently executing script The timestamp is of a format that is suitable for feeding to the date() function If an error occurs in retrieving the last modification date, false will be returned

getmyinode()

Syntax

int getmyinode(void)

Description

The getmyinode() function returns the current executing script's inode information,

or false on error