ini_get

(PHP 4, PHP 5, PHP 7, PHP 8)

ini_get — 設定オプションの値を得る

説明

ini_get(string $option): string|false

成功時に、設定オプションの値を返します。

パラメータ

option: 設定オプションの名前。

戻り値

成功した場合に設定オプションの値、 null 値の場合は空の文字列を返します。その設定オプションが存在しない場合は false を返します。

例

例1 ini_get() の例

<?php

/*
php.ini で以下のように設定されているものとします:

display_errors = On
register_globals = Off
post_max_size = 8M
*/

echo 'display_errors = ' . ini_get('display_errors') . "\n";
echo 'register_globals = ' . (int) ini_get('register_globals') . "\n";
echo 'post_max_size = ' . ini_get('post_max_size') . "\n";
echo 'post_max_size + 1 = ' . (rtrim(ini_get('post_max_size'), 'KMG') + 1) . "\n";
echo 'post_max_size in bytes = ' . return_bytes(ini_get('post_max_size'));

function return_bytes($val)
{
    $val = trim($val);
    $num = (int) rtrim($val, 'KMG');
    $last = strtolower($val[strlen($val) - 1]);

    switch ($last) {
        // 'G' も使えます
        case 'g':
            $num = $num * 1024 * 1024 * 1024;
            break;
        case 'm':
            $num = $num * 1024 * 1024;
            break;
        case 'k':
            $num *= 1024;
            break;
    }

    return $num;
}

?>

上の例の出力は、たとえば以下のようになります。

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

注意

注意: boolean 値を探す場合

off という boolean の ini 値は空文字列または "0" として返されます。一方で on の ini 値は "1" として返されます。また、この関数はリテラル文字列で設定された INI 値を返すこともできます。

注意: メモリサイズの値を探す場合

upload_max_filesize のようなメモリサイズの値の場合、 php.ini上で省略形で格納されています。 ini_get()はphp.iniに格納されている値をそのままの形式で返します。整数表現に変換したりはしません。これらの値に通常の算術的な関数を施すと予期しない結果を得てしまいます。上の例では、省略形の表記から本来のバイト数に変換する PHP ソースのひとつの例を示しています。

注意:
ini_get() は、"配列" 形式の ini オプション (pdo.dsn.* など) を読むことができません。この場合は false を返します。

参考

get_cfg_var() - PHP 設定オプションの値を取得する
ini_get_all() - すべての設定オプションを得る
ini_restore() - 設定オプションの値を元に戻す
ini_set() - 設定オプションの値を設定する

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User Contributed Notes 12 notes

down

Stas Trefilov, OpteamIS ¶

14 years ago

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;
    }
}
?>

down

devsrealmGuy ¶

3 years ago

Here is another way to get the result in bytes using PHP8

<?php

    /**
     * @param string $size
     * @return int
     * @author DevsrealmGuy
     */
    public function getBytes(string $size): int
    {
        $size = trim($size);

        #
        # Separate the value from the metric(i.e MB, GB, KB)
        #
        preg_match('/([0-9]+)[\s]*([a-zA-Z]+)/', $size, $matches);

        $value = (isset($matches[1])) ? $matches[1] : 0;
        $metric = (isset($matches[2])) ? strtolower($matches[2]) : 'b';

        #
        # Result of $value multiplied by the matched case
        # Note: (1024 ** 2) is same as (1024 * 1024) or pow(1024, 2)
        #
        $value *= match ($metric) {
            'k', 'kb' => 1024,
            'm', 'mb' => (1024 ** 2),
            'g', 'gb' => (1024 ** 3),
            't', 'tb' =>  (1024 ** 4),
            default => 0
        };

        return (int)$value;
    }

        #
        # TEST: This default to 0 if it doesn't conform with the match standard
        #
        echo getBytes('2GB') . "</br>";
        # OUTPUT: 2147483648
        echo getBytes('4tb') . "</br>";
        # OUTPUT: 4398046511104
        echo getBytes('5345etrgrfd') . "</br>";
        # OUTPUT: 0
        echo getBytes('357568336586') . "</br>";
        # OUTPUT: 0
?>

down

IceNV ¶

7 years ago

Be aware that max_execution_time can be altered by XDebug.

While debugging a script locally that made use of <?php ini_get('max_execution_time'); ?> 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.

down

filh at filh dot org ¶

18 years ago

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.

down

Ivo Mandalski ¶

13 years ago

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;
    }
?>

down

Joe Huss detain at interserver dot net ¶

2 years ago

Here is a version combining a few of the examples here that does *not* require php8 nor does it generate a warning

/**
* gets the value in bytes converted from a human readable string like 10G'
* 
* @param mixed $val the human readable/shorthand version of the value
* @return int the value converted to bytes
*/
function return_bytes($val) {
    $val = trim($val);
    preg_match('/([0-9]+)[\s]*([a-zA-Z]+)/', $val, $matches);
    $value = (isset($matches[1])) ? intval($matches[1]) : 0;
    $metric = (isset($matches[2])) ? strtolower($matches[2]) : 'b';
    switch ($metric) {
        case 'tb':
        case 't':
            $value *= 1024;
        case 'gb':
        case 'g':
            $value *= 1024;
        case 'mb':
        case 'm':
            $value *= 1024;
        case 'kb':
        case 'k':
            $value *= 1024;
    }
    return $value;
}

down

david dot tulloh at infaze dot com dot au ¶

19 years ago

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.

down

-1

bishop@php ¶

9 years ago

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.

down

-1

peter ¶

16 years ago

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.

down

-2

nicolas dot grekas+php at gmail dot com ¶

15 years ago

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;
    }
}

?>

down

-3

Der Graph ¶

20 years ago

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'.

down

-4

bishop at php dot net ¶

9 years ago

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.

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