<?php
/*
Our php.ini contains the following settings:
display_errors = On
register_globals = Off
post_max_size = 8M
*/
echo 'display_errors = ' . ini_get('display_errors') . "\n";
echo 'register_globals = ' . ini_get('register_globals') . "\n";
echo 'post_max_size = ' . ini_get('post_max_size') . "\n";
echo 'post_max_size+1 = ' . (ini_get('post_max_size')+1) . "\n";
echo 'post_max_size in bytes = ' . return_bytes(ini_get('post_max_size'));
function return_bytes($val) {
  $val = trim($val);
  $last = strtolower($val[strlen($val)-1]);
  switch($last) {
    // The 'G' modifier is available since PHP 5.1.0
    case 'g':
      $val *= 1024;
    case 'm':
      $val *= 1024;
    case 'k':
      $val *= 1024;
  }
  return $val;
}
?>

上述代碼的運(yùn)行結(jié)果類似如下：

display_errors = 1
register_globals = 0
post_max_size = 8M
post_max_size+1 = 9
post_max_size in bytes = 8388608

如果想獲取整個(gè)php.ini里的變量值，我們可以用ini_get的加強(qiáng)函數(shù) ini_get_all()。

ini_get_all()函數(shù)以數(shù)組的形式返回整個(gè)php的環(huán)境變量，用法也很簡(jiǎn)單。

實(shí)例一：

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

上述代碼的運(yùn)行結(jié)果類似如下：

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
    )
  ...
)

實(shí)例二：

<?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
?>

輸出結(jié)果類似如下：

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

與ini_get()相對(duì)的函數(shù)是ini_set()，ini_set具有更改php.ini設(shè)置的功能。例如當(dāng)某腳本運(yùn)行超時(shí)時(shí)，可以設(shè)置其最大執(zhí)行時(shí)間。

希望本文所述對(duì)大家的php程序設(shè)計(jì)有所幫助。

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