ini_get()

(PHP 4, PHP 5, PHP 7)

获取一个配置选项的值

说明

成功时返回配置选项的值。

参数

配置选项名称。

返回值

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。

范例

一些ini_get()例子

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

注释

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。Note:

ini_get()无法读取"array"的 ini 选项，例如 pdo.dsn.*，在这个例子中会返回FALSE。

更新日志

参见

• get_cfg_var() 获取 PHP 配置选项的值
• ini_get_all() 获取所有配置选项
• ini_restore() 恢复配置选项的值
• ini_set() 为一个配置选项设置值

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 

Be aware that max_execution_time can be altered by XDebug.
While debugging a script locally that made use of  it returned 0 when XDebug remote debugging was enabled and the IDE was listening to it.
It makes sense, since debugging manually takes time so we don't want the script to time out ; but in that particular case, it made it look to the script like max_execution_time was 0, so calculations were wrong.
You can see in phpinfo() that local value is 0 in that case, but master value is the correct one you set in your php.ini.

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.

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.

Yet another implementation of return_bytes:

If you're using PHP >= 7, you might replace ?: with ?? to avoid the use of the @ silencer.

This version of return_bytes takes care of the MB, GB, KB cases along with the M,G,K ones.
Hope this is helpful! 

In a similar vein, converting flags to booleans proper:

If you're using PHP >= 7, consider replacing ?: with ?? and removing the @ silencer.

Here is how to accurately test for boolean php.ini values: 

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.

It might be useful for included scripts that include other files to extend the 'include_path' variable:

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'.

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