pre-check.php > OX_checkSystemInitialRequirements()

概要

• インストール失敗や運用がうまくいかなくなった状況を調べる
• システムの設定による形式外のエラー・メッセージを調べる
• boolかintが戻り、負数の場合エラー
• 戻り値-1　組み込み関数function_existsが存在しない
• 戻り値-2　組み込み関数strposもしくはparse_urlが存在しない
• 戻り値-3　上記以外の組み込み関数が存在しない
• 戻り値-4　要求されたメモリ量が少なすぎる

引数

• エラー・メッセージの配列

実装

function OX_checkSystemInitialRequirements(&$aErrors){

    // Variables for tracking if the test has passed or not,
    // and if not, what value to return
    $isSystemOK = true;
    $return = true;

• 下の7つの関数は、OpenXで使われる関数をチェックするために使うので、別に調べる

// The general list of built in PHP functions that are required to
    // run OpenX, apart from the functions:
    //
    //   - "function_exists"
    //   - "array_intersect"
    //   - "explode"
    //   - "ini_get"
    //   - "trim"
    //   - "parse_url"
    //   - "strpos"
    //
    // These other functions are tested separately, as they are
    // required to test for the existence of the functions in the
    // array below!
    $aRequiredFunctions = array(
        'dirname',
        'empty',
        'file_exists',
        'ini_set',
        'parse_ini_file',
        'version_compare'
    );

    // Prepare error strings, in the simplest possible way
    $errorString1 = 'The built in PHP function "';
    $errorString2 = '" is in the "disable_functions" list in your "php.ini" file.';

• function_existsの存在を調べる
• function_existsが存在しない場合、これ以上調べることができないので-1を返す

// Need "function_exists" to be able to test for functions required
    // for testing what is in the "disabled_functions" list
    if (!function_exists('function_exists')) {
        $aErrors[] = $errorString1 . 'function_exists' . $errorString2;
        // Cannot detect any more errors, as function_exists is
        // needed to detect the required functions!
        return -1;
    }

• 以下2つの関数はエラー表示に使うので調べる

// Test for existence of "parse_url" and "strpos", which are
    // special cases required for the display of the error message
    // in the event of anything failing in this test!
    if (!function_exists('parse_url')) {
        $aErrors[] = $errorString1 . 'parse_url' . $errorString2;
        $isSystemOK = false;
        if ($return === true) {
            $return = -2;
        }
    }
    if (!function_exists('strpos')) {
        $aErrors[] = $errorString1 . 'strpos' . $errorString2;
        $isSystemOK = false;
        if ($return === true) {
            $return = -2;
        }
    }

• 関数がdisabled_functionsかどうか、下で調べるために使う関数のチェック

// Test for existence of "array_intersect", "explode", "ini_get"
    // and "trim", which are all required as part of the code to test
    // which functions are in the "disabled_functions" list below...
    if (!function_exists('array_intersect')) {
        $aErrors[] = $errorString1 . 'array_intersect' . $errorString2;
        $isSystemOK = false;
        if ($return === true) {
            $return = -3;
        }
    }
    if (!function_exists('explode')) {
        $aErrors[] = $errorString1 . 'explode' . $errorString2;
        $isSystemOK = false;
        if ($return === true) {
            $return = -3;
        }
    }
    if (!function_exists('ini_get')) {
        $aErrors[] = $errorString1 . 'ini_get' . $errorString2;
        $isSystemOK = false;
        if ($return === true) {
            $return = -3;
        }
    }
    if (!function_exists('trim')) {
        $aErrors[] = $errorString1 . 'trim' . $errorString2;
        $isSystemOK = false;
        if ($return === true) {
            $return = -3;
        }
    }

• $aRequiredFucntionsの関数が使えるか調べる

// Test the disabled functons list with required functions list
    // defined above in $aRequiredFunctions
    $aDisabledFunctions = explode(',', ini_get('disable_functions'));
    foreach ($aDisabledFunctions as $key => $value) {
        $aDisabledFunctions[$key] = trim($value);
    }
    $aNeededFunctions = array_intersect($aDisabledFunctions, $aRequiredFunctions);
    if (count($aNeededFunctions) > 0) {
        $isSystemOK = false;
        foreach ($aNeededFunctions as $functionName) {
            $aErrors[] = $errorString1 . $functionName . $errorString2;
        }
    }

• PHPのバージョンを確認

// Check PHP version, as use of PHP < 5.1.4 will result in parse errors
    $errorMessage = "PHP version 5.1.4, or greater, was not detected.";
    if (function_exists('version_compare')) {
        $result = version_compare(phpversion(), '5.1.4', '<');
        if ($result) {
            $aErrors[] = $errorMessage;
            $isSystemOK = false;
            if ($return === true) {
                $return = -3;
            }
        }
    }

• PHPメモリの確認

// Check minimum memory requirements are okay (24MB)
    $minimumRequiredMemory = OX_getMinimumRequiredMemory();
    $phpMemoryLimit = OX_getMemoryLimitSizeInBytes();
    if ($phpMemoryLimit > 0 && $phpMemoryLimit < $minimumRequiredMemory) {
        // The memory limit is too low, but can it be increased?
        $memoryCanBeSet = OX_checkMemoryCanBeSet();
        if (!$memoryCanBeSet) {
            $minimumRequiredMemoryInMB = $minimumRequiredMemory / 1048576;
            $errorMessage = 'The PHP "memory_limit" value is set to less than the required minimum of ' .
                            $minimumRequiredMemoryInMB . 'MB, but because the built in PHP function "ini_set" ' .
                            'has been disabled, the memory limit cannot be automatically increased.';
            $aErrors[] = $errorMessage;
            $isSystemOK = false;
            if ($return === true) {
                $return = -4;
            }
        }
    }

• magic_quotes_runtimeを調べ、破棄する

// Check magic_quotes_runtime and try to unset it
    $GLOBALS['original_get_magic_quotes_runtime'] = OX_getMagicQuotesRuntime();
    if ($GLOBALS['original_get_magic_quotes_runtime']) {
        ini_set('magic_quotes_runtime', 0);
        if (OX_getMagicQuotesRuntime()) {
            // try deprecated set_magic_quotes_runtime
            if (function_exists('set_magic_quotes_runtime')) {
                @set_magic_quotes_runtime(0);
            }
        }
        // check magic_quotes_runtime again, stop if still is set
        if (OX_getMagicQuotesRuntime()) {
            $aErrors[] = 'The PHP magic_quotes_runtime option is ON, and cannot be automatically turned off.';
            $isSystemOK = false;
            if ($return === true) {
                $return = -5;
            }
        }
    }

    if (!$isSystemOK) {
        return $return;
    }
    return true;
}

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