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Dokumen ini menggunakan Manual laman web PHP Cina Lepaskan
(PHP 4, PHP 5, PHP 7)
ini_get — 获取一个配置选项的值
$varname
)成功时返回配置选项的值。
varname
配置选项名称。
成功是返回配置选项值的字符串,null 的值则返回空字符串。如果配置选项不存在,将会返回 FALSE
。
Example #1 一些 ini_get() 例子
<?php
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 ) {
// 自 PHP 5.1.0 起可以使用修饰符 'G'
case 'g' :
$val *= 1024 ;
case 'm' :
$val *= 1024 ;
case 'k' :
$val *= 1024 ;
}
return $val ;
}
?>
以上例程的输出类似于:
display_errors = 1 register_globals = 0 post_max_size = 8M post_max_size+1 = 9 post_max_size in bytes = 8388608
Note: 当查询一个 boolean 值
一个 off 的 boolean ini 值将会以空字符串或者 "0" 返回;on 的 ini 值会以 "1" 返回。 此函数也会返回 INI 值的文字字符串。
Note: 当查询一个内存尺寸的值
许多内存尺寸的 ini 值,类似 upload_max_filesize 是以简写表示法储存在 php.ini 文件里。 ini_get() 会返回 php.ini 文件中储存的确切字符串,而不是它的等量 integer 。 尝试对这些值使用常规算术运算函数将不会得到预期的结果。 以上例子显示了转换简写表示法为字节的一种方式,和 PHP 源码所做的比较像。
版本 | 说明 |
---|---|
5.3.0 |
当配置项不存在,之前会返回空字符串,现在会返回 FALSE 。
|
[#1] bishop at php dot net [2015-09-02 19:52:28]
In a similar vein, converting flags to booleans proper:
<?php
function return_boolean($val)
{
static $map = array ('on' => true, 'true' => true, 'off' => false, 'false' => false);
return @($map[strtolower($val)] ?: (bool)$val);
}
?>
If you're using PHP >= 7, consider replacing ?: with ?? and removing the @ silencer.
[#2] bishop@php [2015-09-02 19:37:00]
Yet another implementation of return_bytes:
<?php
function return_bytes($val)
{
assert('1 === preg_match("/^\d+([kmg])?$/i", $val)');
static $map = array ('k' => 1024, 'm' => 1048576, 'g' => 1073741824);
return (int)$val * @($map[strtolower(substr($val, -1))] ?: 1);
}
?>
If you're using PHP >= 7, you might replace ?: with ?? to avoid the use of the @ silencer.
[#3] Ivo Mandalski [2011-11-15 08:27:52]
This version of return_bytes takes care of the MB, GB, KB cases along with the M,G,K ones.
Hope this is helpful!
<?php
public static function return_bytes ($val)
{
if(empty($val))return 0;
$val = trim($val);
preg_match('#([0-9]+)[\s]*([a-z]+)#i', $val, $matches);
$last = '';
if(isset($matches[2])){
$last = $matches[2];
}
if(isset($matches[1])){
$val = (int) $matches[1];
}
switch (strtolower($last))
{
case 'g':
case 'gb':
$val *= 1024;
case 'm':
case 'mb':
$val *= 1024;
case 'k':
case 'kb':
$val *= 1024;
}
return (int) $val;
}
?>
[#4] Stas Trefilov, OpteamIS [2010-03-26 10:08:06]
another version of return_bytes which returns faster and does not use multiple multiplications (sorry:). even if it is resolved at compile time it is not a good practice;
no local variables are allocated;
the trim() is omitted (php already trimmed values when reading php.ini file);
strtolower() is replaced by second case which wins us one more function call for the price of doubling the number of cases to process (may slower the worst-case scenario when ariving to default: takes six comparisons instead of three comparisons and a function call);
cases are ordered by most frequent goes first (uppercase M-values being the default sizes);
specs say we must handle integer sizes so float values are converted to integers and 0.8G becomes 0;
'Gb', 'Mb', 'Kb' shorthand byte options are not implemented since are not in specs, see
http://www.php.net/manual/en/faq.using.php#faq.using.shorthandbytes
<?php
function return_bytes ($size_str)
{
switch (substr ($size_str, -1))
{
case 'M': case 'm': return (int)$size_str * 1048576;
case 'K': case 'k': return (int)$size_str * 1024;
case 'G': case 'g': return (int)$size_str * 1073741824;
default: return $size_str;
}
}
?>
[#5] nicolas dot grekas+php at gmail dot com [2009-08-19 10:51:14]
Here is how to accurately test for boolean php.ini values:
<?php
function ini_get_bool($a)
{
$b = ini_get($a);
switch (strtolower($b))
{
case 'on':
case 'yes':
case 'true':
return 'assert.active' !== $a;
case 'stdout':
case 'stderr':
return 'display_errors' === $a;
default:
return (bool) (int) $b;
}
}
?>
[#6] peter [2008-07-29 14:25:11]
The above example function called return_bytes() assumes that ini_get('upload_max_filesize') delivers only one letter at the end. As I've seen 'Mb' and things like that, I'd suggest to change the $last = ... part into $last = strtolower(substr($val,strlen($val/1),1)).
I'd call it $unit then.
[#7] filh at filh dot org [2005-11-21 06:24:55]
Concerning the value retourned, it depends on how you set it.
I had the problem with horde-3 which test the safe_mode value.
THan :
- if you set the value with php_admin_value safe_mode Off (or On) ini_get returns the string
- if you set the value with php_admin_flag safe_mode Off (or On) ini_get returns the boolean.
[#8] david dot tulloh at infaze dot com dot au [2005-06-21 19:01:37]
You can set custom entries in the ini file to provide globals such as database details.
However these must be retrieved with get_cfg_var, ini_get won't work.
[#9] Der Graph [2004-08-16 11:59:05]
It might be useful for included scripts that include other files to extend the 'include_path' variable:
<?php ini_set('include_path',ini_get('include_path').':../includes:'); ?>
Sometimes, it may also be useful to store the current 'include_path' in a variable, overwrite it, include, and then restore the old 'include_path'.