ini_get_all()

(PHP 4 >= 4.2.0, PHP 5, PHP 7)

获取所有配置选项

说明

ini_get_all([string $extension[,bool $details= true]]): array

获取所有已注册的配置选项

参数

$extension: 可选的扩展名称。如果设置了，此函数仅仅返回指定该扩展的选项。
$details: 获取详细设置或者仅仅是每个设置的当前值。默认是TRUE（获取详细信息）。

返回值

返回一个关联数组，指令名称是数组的键。

当$details为TRUE（默认），数组会包含global_value（php.ini中的设置）、local_value（可能是ini_set()或.htaccess中的设置）以及access（访问级别）。

当$details为FALSE，这个值会是选项的当前值。

参见手册章节中访问级别含义的信息。

Note:
指令可以有多个访问级别，这也是为什么access会显示适当的位掩码。

注释

Note:
ini_get_all()忽略"array"的 ini 选项，例如 pdo.dsn.*。

更新日志

版本	说明
5.3.0	增加参数`$details`。

范例

Example #1ini_get_all()例子

<?php
print_r(ini_get_all("pcre"));
print_r(ini_get_all());
?>

以上例程的输出类似于：

Array
(
    [pcre.backtrack_limit] => Array
        (
            [global_value] => 100000
            [local_value] => 100000
            [access] => 7
        )
    [pcre.recursion_limit] => Array
        (
            [global_value] => 100000
            [local_value] => 100000
            [access] => 7
        )
)
Array
(
    [allow_call_time_pass_reference] => Array
        (
            [global_value] => 0
            [local_value] => 0
            [access] => 6
        )
    [allow_url_fopen] => Array
        (
            [global_value] => 1
            [local_value] => 1
            [access] => 4
        )
    ...
)

禁用$details

<?php
print_r(ini_get_all("pcre", false)); // Added in PHP 5.3.0
print_r(ini_get_all(null, false)); // Added in PHP 5.3.0
?>

以上例程的输出类似于：

Array
(
    [pcre.backtrack_limit] => 100000
    [pcre.recursion_limit] => 100000
)
Array
(
    [allow_call_time_pass_reference] => 0
    [allow_url_fopen] => 1
    ...
)

参见

怎样修改配置设定
ini_get() 获取一个配置选项的值
ini_restore() 恢复配置选项的值
ini_set() 为一个配置选项设置值
get_loaded_extensions() 返回所有编译并加载模块名的 array
phpinfo() 输出关于 PHP 配置的信息
ReflectionExtension::getINIEntries() 获取ini配置

I guess the third entry is the required access level (to change this variable at runtime):
Constant      Value   Meaning 
PHP_INI_USER   1     Entry can be set in user scripts 
PHP_INI_PERDIR  2     Entry can be set in php.ini, .htaccess or httpd.conf 
PHP_INI_SYSTEM  4     Entry can be set in php.ini or httpd.conf 
PHP_INI_ALL    7     Entry can be set anywhere 
See also the docs for ini_set()
Hugo.

echo recreate_php_ini();
/**
 * Sample function to re-create a php ini config file.
 *
 * @return string
 */
function recreate_php_ini() {
  $a = ini_get_all();
  $data = [];
  foreach (array_keys($a) as $k) {
    $ss = split("\.", $k);
    if (count($ss) == 1) {
      $sec = "PHP";
      $v = $k;
    } else {
      $sec = $ss[0];
      $v = $ss[1];
    }
    $data[$sec][$v] = $a[$k]['global_value'];
  }
  ksort($data);
  $out = "";
  foreach ($data as $sec => $data) {
    $out .= "[$sec]\n";
    ksort($data);
    foreach ($data as $k => $v) {
      if (is_numeric($v)) {
        $out .= sprintf("%-40s = %s\n", $k, $v);
      } else {
        $out .= sprintf("%-40s = \"%s\"\n", $k, $v);
      }
    }
    $out .= "\n";
  }
  return $out;
}

If you want to load and parse your own ini file, have a look at parse_ini_file() function. Example:
<?php
// ...
$my_data = parse_ini_file($my_file, true);

You can use the following snippet on servers to grab the live/staging configs in order to be able to replicate those in your development environment. (I use `php -a` for this)
 <?php
foreach (ini_get_all(null, false) as $key => $value) echo "$key=$value;\n";
?>

Since a certain PHP version (I think it's 5.2.5) it is no longer possible to override INI entrys set with php_admin_* in httpd.conf. The access level will be set to 4 (PHP_INI_SYSTEM), which is also returned by this function.
The constants mentioned below are available in PHP, but without the prefix (e.g. INI_USER, INI_PERDIR).