The manual states above:
<<<
The default is to allow dynamic loading, except when using safe mode. In safe mode, it's always impossible to use dl().
>>>
...however, on the manual page for dl(), it states:
<<<
Note: dl() is not supported in multithreaded Web servers. Use the extensions statement in your php.ini when operating under such an environment. However, the CGI and CLI build are not affected !
Note: As of PHP 5, the dl() function is deprecated in every SAPI except CLI. Use Extension Loading Directives method instead.
Note: Since PHP 6 this function is disabled in all SAPIs, except CLI, CGI and embed.
>>>
CXXIII. PHP volby a informace
Úvod
Tyto funkce vám umožňují zjistit řadu informací o vlastním PHP, jako je konfigurace, nahraná rozšíření, verze a mnohé další. Naleznete zde také funkce, které vám umožňí nastavit volby běžícího PHP. Pravděporobně nejznámější funkce PHP - phpinfo() - se nachází právě v této sekci.
Požadavky
Tyto funkce jsou k dispozici jako součást standardního modulu, který je vždy dostupný.
Instalace
K používání těchto funkcí není třeba žádná instalace, jsou součástí jádra PHP.
Konfigurace běhu
Chování těchto funkcí je ovlivněno nastavením parametrů v php.ini.
Tabulka 233. PHP Options/Inf Configuration Options
| Name | Default | Changeable | Changelog |
|---|---|---|---|
| assert.active | "1" | PHP_INI_ALL | |
| assert.bail | "0" | PHP_INI_ALL | |
| assert.warning | "1" | PHP_INI_ALL | |
| assert.callback | NULL | PHP_INI_ALL | |
| assert.quiet_eval | "0" | PHP_INI_ALL | |
| enable_dl | "1" | PHP_INI_SYSTEM | |
| max_execution_time | "30" | PHP_INI_ALL | |
| max_input_time | "-1" | PHP_INI_PERDIR | Available since PHP 4.3.0. |
| magic_quotes_gpc | "1" | PHP_INI_PERDIR | PHP_INI_ALL in PHP <= 4.2.3. |
| magic_quotes_runtime | "0" | PHP_INI_ALL |
Pro další detaily a definice konstant PHP_INI_*, viz dokumentace k ini_set().
Zde je stručný popis konfiguračních direktiv.
- assert.active boolean
Enable assert() evaluation.
- assert.bail boolean
Terminate script execution on failed assertions.
- assert.warning boolean
Issue a PHP warning for each failed assertion.
- assert.callback string
user function to call on failed assertions
- assert.quiet_eval boolean
Use the current setting of error_reporting() during assertion expression evaluation. If enabled, no errors are shown (implicit error_reporting(0)) while evaluation. If disabled, errors are shown according to the settings of error_reporting()
- enable_dl boolean
This directive is really only useful in the Apache module version of PHP. You can turn dynamic loading of PHP extensions with dl() on and off per virtual server or per directory.
The main reason for turning dynamic loading off is security. With dynamic loading, it's possible to ignore all open_basedir restrictions. The default is to allow dynamic loading, except when using bezpečný režim. In bezpečný režim, it's always impossible to use dl().
- max_execution_time integer
This sets the maximum time in seconds a script is allowed to run before it is terminated by the parser. This helps prevent poorly written scripts from tying up the server. The default setting is 30.
The maximum execution time is not affected by system calls, stream operations etc. Please see the set_time_limit() function for more details.
You can not change this setting with ini_set() when running in bezpečný režim. The only workaround is to turn off safe mode or by changing the time limit in the php.ini.
Your web server can have other timeouts. E.g. Apache has Timeout directive, IIS has CGI timeout function, both default to 300 seconds. See the web server documentation for meaning of it.
- max_input_time integer
This sets the maximum time in seconds a script is allowed to parse input data, like POST, GET and file uploads.
- magic_quotes_gpc boolean
Sets the magic_quotes state for GPC (Get/Post/Cookie) operations. When magic_quotes are on, all ' (single-quote), " (double quote), \ (backslash) and NUL's are escaped with a backslash automatically.
Poznámka: If the magic_quotes_sybase directive is also ON it will completely override magic_quotes_gpc. Having both directives enabled means only single quotes are escaped as ''. Double quotes, backslashes and NUL's will remain untouched and unescaped.
See also get_magic_quotes_gpc()
- magic_quotes_runtime boolean
If magic_quotes_runtime is enabled, most functions that return data from any sort of external source including databases and text files will have quotes escaped with a backslash. If magic_quotes_sybase is also on, a single-quote is escaped with a single-quote instead of a backslash.
Typy prostředků
Toto rozšíření nemá definován žádný typ prostředku (resource).
Předdefinované konstanty
Konstanty z tohoto seznamu jsou vždy dostupné jako součást jádra PHP.
Tabulka 234. Pre-defined phpcredits() constants
| Constant | Value | Description |
|---|---|---|
| CREDITS_GROUP | 1 | A list of the core developers |
| CREDITS_GENERAL | 2 | General credits: Language design and concept, PHP authors and SAPI module. |
| CREDITS_SAPI | 4 | A list of the server API modules for PHP, and their authors. |
| CREDITS_MODULES | 8 | A list of the extension modules for PHP, and their authors. |
| CREDITS_DOCS | 16 | The credits for the documentation team. |
| CREDITS_FULLPAGE | 32 | Usually used in combination with the other flags. Indicates that a complete stand-alone HTML page needs to be printed including the information indicated by the other flags. |
| CREDITS_QA | 64 | The credits for the quality assurance team. |
| CREDITS_ALL | -1 | All the credits, equivalent to using: CREDITS_DOCS + CREDITS_GENERAL + CREDITS_GROUP + CREDITS_MODULES + CREDITS_QA CREDITS_FULLPAGE. It generates a complete stand-alone HTML page with the appropriate tags. This is the default value. |
Tabulka 235. phpinfo() constants
| Constant | Value | Description |
|---|---|---|
| INFO_GENERAL | 1 | The configuration line, php.ini location, build date, Web Server, System and more. |
| INFO_CREDITS | 2 | PHP Credits. See also phpcredits(). |
| INFO_CONFIGURATION | 4 | Current Local and Master values for PHP directives. See also ini_get(). |
| INFO_MODULES | 8 | Loaded modules and their respective settings. |
| INFO_ENVIRONMENT | 16 | Environment Variable information that's also available in $_ENV. |
| INFO_VARIABLES | 32 | Shows all predefined variables from EGPCS (Environment, GET, POST, Cookie, Server). |
| INFO_LICENSE | 64 | PHP License information. See also the » license faq. |
| INFO_ALL | -1 | Shows all of the above. This is the default value. |
Obsah
- assert_options — Nastavit/získat různé příznaky výroků
- assert — Ověřit, jestli je výrok neplatný
- dl — Načíst extenzi PHP za běhu
- extension_loaded — zjistit, jestli je extenze načtená
- get_cfg_var — Získat hodnotu volby z konfigurace PHP
- get_current_user — Získat jméno vlastníka současného PHP skriptu
- get_defined_constants — Returns an associative array with the names of all the constants and their values
- get_extension_funcs — Vrátit pole jmen funkcí určitého modulu
- get_include_path — Gets the current include_path configuration option
- get_included_files — Vrátit pole jmen všech souborů, které byly ve skriptu načteny pomocí include_once()
- get_loaded_extensions — Vrátit pole se jmény všech zkompilovaných a načtených modulů (extenzí)
- get_magic_quotes_gpc — Získat současné aktivní nastavení magic_quotes_gpc
- get_magic_quotes_runtime — Vrátit současné aktivní nastavení magic_quotes_runtime
- get_required_files — Vrátit pole jmen všech souborů, které byly v určitém skriptu načteny pomocí require_once()
- getenv — Získat hodnotu systémové proměnné
- getlastmod — Získat čas poslení modifikace skriptu
- getmygid — Get PHP script owner's GID
- getmyinode — Získat inode současného skriptu
- getmypid — Získat process ID PHP
- getmyuid — Získat UID majitele PHP skriptu
- getopt — Gets options from the command line argument list
- getrusage — Získat informace o současném využití zdrojů
- ini_alter — Změnit hodnotu konfigurační volby
- ini_get_all — Gets all configuration options
- ini_get — Získat hodnotu konfigurační volby
- ini_restore — Obnovit původní hodnotu konfigurační volby
- ini_set — Změnit hodnotu konfigurační volby
- main — Dummy for main()
- memory_get_peak_usage — Returns the peak of memory allocated by PHP
- memory_get_usage — Returns the amount of memory allocated to PHP
- php_ini_scanned_files — Return a list of .ini files parsed from the additional ini dir
- php_logo_guid — Get the logo guid
- php_sapi_name — Vrátit typ rozhraní mezi web serverem a PHP Returns the type of interface between web server and PHP
- php_uname — Vrátit informaci o operačním systému, na kterém bylo PHP zkompilováno
- phpcredits — Vytisknout credits pro PHP
- phpinfo — Vytisknout spoustu informací o PHP
- phpversion — Získat současnou verzi PHP
- putenv — Nastavit hodnotu systémové proměnné
- restore_include_path — Restores the value of the include_path configuration option
- set_include_path — Sets the include_path configuration option
- set_magic_quotes_runtime — Nastavit současnou aktivní hodnotu magic_quotes_runtime
- set_time_limit — Omezit maximální dobu průběhu skriptu
- sys_get_temp_dir — Returns directory path used for temporary files
- version_compare — Compares two "PHP-standardized" version number strings
- zend_logo_guid — Získat zend guid
- zend_version — Gets the version of the current Zend engine
PHP volby a informace
19-Jul-2007 07:22
15-Mar-2005 05:04
Note: when magic_quotes_gpc is ON, it will also slash values inside both $_SERVER['QUERY_STRING'] and $_SERVER['SCRIPT_NAME'] (and equivalents) will also be slashed.
14-Jun-2004 05:37
You probably don't want to set "magic_quotes_runtime" because it affects even binary file read/write operations. This is especially problematic if you include someone else's library that depends on binary read/write. If you enable "magic_quotes_runtime", be sure to use set_magic_quotes_runtime() function call to disable it before calling someone else's library that does binary read/write.
