The method of using Ini_get to get php.ini variable value in PHP _php technique

This article describes the method used by PHP to obtain the value of php.ini variables in Ini_get. Share to everyone for your reference. The specific analysis is as follows:

To get the value of the variable in php.ini, of course, you can use Phpinfo () to all the PHP configuration information, but if you want a variable value, how do you get it?

PHP provides a function to get the value of a variable in php.ini: Ini_get ()

The use of Ini_get () is very simple, and the following examples illustrate how it is used.

Grammar:

String Ini_get (String varname)

The return value is 0 or 1 if the Boolean type

Instance:

<?php
/* We
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;
>

The results of the above code are similar to the following:

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

If you want to get the value of the variable in the entire php.ini, we can use the Ini_get function Ini_get_all ().

The Ini_get_all () function returns the entire PHP environment variable in the form of an array, and is simple to use.

Example one:

<?php
Print_r (Ini_get_all ("Pcre"));
Print_r (Ini_get_all ());
? >

The results of the above code are similar to the following:

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
    )
  ...
)

Example two:

<?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
?>

The output is similar to the following:

Array
(
  [pcre.backtrack_limit] => 100000
  [Pcre.recursion_limit] => 100000
)
array
(
  [allow_call_time_pass_reference] => 0
  [Allow_url_fopen] => 1
  ...
)

The function relative to Ini_get () is Ini_set () and Ini_set has the ability to change php.ini settings. For example, when a script runs overtime, it can set its maximum execution time.

I hope this article will help you with your PHP program design.