PHP PMA_cacheExists函数代码示例

 /**
  * Test if cached data is available after set
  */
 public function testCacheExists()
 {
     $GLOBALS['server'] = 'server';
     PMA_cacheSet('test_data', 5, true);
     PMA_cacheSet('test_data_2', 5, true);
     $this->assertTrue(PMA_cacheExists('test_data', true));
     $this->assertTrue(PMA_cacheExists('test_data_2', 'server'));
     $this->assertFalse(PMA_cacheExists('fake_data_2', true));
 }

/**
 * Verifies if current MySQL server supports profiling
 *
 * @access  public
 *
 * @return  boolean whether profiling is supported
 */
function PMA_profilingSupported()
{
    if (!PMA_cacheExists('profiling_supported', true)) {
        // 5.0.37 has profiling but for example, 5.1.20 does not
        // (avoid a trip to the server for MySQL before 5.0.37)
        // and do not set a constant as we might be switching servers
        if (defined('PMA_MYSQL_INT_VERSION') && PMA_MYSQL_INT_VERSION >= 50037 && PMA_DBI_fetch_value("SHOW VARIABLES LIKE 'profiling'")) {
            PMA_cacheSet('profiling_supported', true, true);
        } else {
            PMA_cacheSet('profiling_supported', false, true);
        }
    }
    return PMA_cacheGet('profiling_supported', true);
}

/**
 * returns true (int > 0) if current user is superuser
 * otherwise 0
 *
 * @uses    $_SESSION['is_superuser'] for caching
 * @uses    $GLOBALS['userlink']
 * @uses    $GLOBALS['server']
 * @uses    PMA_DBI_try_query()
 * @uses    PMA_DBI_QUERY_STORE
 * @return  integer  $is_superuser
 */
function PMA_isSuperuser()
{
    if (PMA_cacheExists('is_superuser', true)) {
        return PMA_cacheGet('is_superuser', true);
    }
    // with mysql extension, when connection failed we don't have
    // a $userlink
    if (isset($GLOBALS['userlink'])) {
        $r = (bool) PMA_DBI_try_query('SELECT COUNT(*) FROM mysql.user', $GLOBALS['userlink'], PMA_DBI_QUERY_STORE);
        PMA_cacheSet('is_superuser', $r, true);
    } else {
        PMA_cacheSet('is_superuser', false, true);
    }
    return PMA_cacheGet('is_superuser', true);
}

/**
 * sets privilege information extracted from SHOW GRANTS result
 *
 * Detection for some CREATE privilege.
 *
 * Since MySQL 4.1.2, we can easily detect current user's grants using $userlink
 * (no control user needed) and we don't have to try any other method for
 * detection
 *
 * @todo fix to get really all privileges, not only explicitly defined for this user
 * from MySQL manual: (http://dev.mysql.com/doc/refman/5.0/en/show-grants.html)
 * SHOW GRANTS displays only the privileges granted explicitly to the named
 * account. Other privileges might be available to the account, but they are not
 * displayed. For example, if an anonymous account exists, the named account
 * might be able to use its privileges, but SHOW GRANTS will not display them.
 *
 * @uses    $_SESSION['is_create_db_priv'] for caching
 * @uses    $_SESSION['is_process_priv'] for caching
 * @uses    $_SESSION['is_reload_priv'] for caching
 * @uses    $_SESSION['db_to_create'] for caching
 * @uses    $_SESSION['dbs_where_create_table_allowed'] for caching
 * @uses    $GLOBALS['is_create_db_priv'] to set it
 * @uses    $GLOBALS['is_process_priv'] to set it
 * @uses    $GLOBALS['is_reload_priv'] to set it
 * @uses    $GLOBALS['db_to_create'] to set it
 * @uses    $GLOBALS['dbs_where_create_table_allowed'] to set it
 * @uses    $GLOBALS['server']
 * @uses    PMA_DBI_try_query()
 * @uses    PMA_DBI_fetch_row()
 * @uses    PMA_DBI_free_result()
 * @uses    PMA_DBI_getError()
 * @uses    PMA_unQuote()
 * @uses    PMA_backquote()
 * @uses    preg_match()
 * @uses    preg_replace()
 * @uses    substr()
 * @uses    strpos()
 */
function PMA_analyseShowGrant()
{
    if (PMA_cacheExists('is_create_db_priv', true)) {
        $GLOBALS['is_create_db_priv'] = PMA_cacheGet('is_create_db_priv', true);
        $GLOBALS['is_process_priv'] = PMA_cacheGet('is_process_priv', true);
        $GLOBALS['is_reload_priv'] = PMA_cacheGet('is_reload_priv', true);
        $GLOBALS['db_to_create'] = PMA_cacheGet('db_to_create', true);
        $GLOBALS['dbs_where_create_table_allowed'] = PMA_cacheGet('dbs_where_create_table_allowed', true);
        return;
    }
    // defaults
    $GLOBALS['is_create_db_priv'] = false;
    $GLOBALS['is_process_priv'] = true;
    $GLOBALS['is_reload_priv'] = false;
    $GLOBALS['db_to_create'] = '';
    $GLOBALS['dbs_where_create_table_allowed'] = array();
    $rs_usr = PMA_DBI_try_query('SHOW GRANTS');
    if (!$rs_usr) {
        return;
    }
    $re0 = '(^|(\\\\\\\\)+|[^\\\\])';
    // non-escaped wildcards
    $re1 = '(^|[^\\\\])(\\\\)+';
    // escaped wildcards
    while ($row = PMA_DBI_fetch_row($rs_usr)) {
        // extract db from GRANT ... ON *.* or GRANT ... ON db.*
        $db_name_offset = strpos($row[0], ' ON ') + 4;
        $show_grants_dbname = substr($row[0], $db_name_offset, strpos($row[0], '.', $db_name_offset) - $db_name_offset);
        $show_grants_dbname = PMA_unQuote($show_grants_dbname, '`');
        $show_grants_str = substr($row[0], 6, strpos($row[0], ' ON ') - 6);
        if ($show_grants_str == 'RELOAD') {
            $GLOBALS['is_reload_priv'] = true;
        }
        /**
         * @todo if we find CREATE VIEW but not CREATE, do not offer
         * the create database dialog box
         */
        if ($show_grants_str == 'ALL' || $show_grants_str == 'ALL PRIVILEGES' || $show_grants_str == 'CREATE' || strpos($show_grants_str, 'CREATE,') !== false) {
            if ($show_grants_dbname == '*') {
                // a global CREATE privilege
                $GLOBALS['is_create_db_priv'] = true;
                $GLOBALS['is_reload_priv'] = true;
                $GLOBALS['db_to_create'] = '';
                $GLOBALS['dbs_where_create_table_allowed'][] = '*';
                // @todo we should not break here, cause GRANT ALL *.*
                // could be revoked by a later rule like GRANT SELECT ON db.*
                break;
            } else {
                // this array may contain wildcards
                $GLOBALS['dbs_where_create_table_allowed'][] = $show_grants_dbname;
                $dbname_to_test = PMA_backquote($show_grants_dbname);
                if ($GLOBALS['is_create_db_priv']) {
                    // no need for any more tests if we already know this
                    continue;
                }
                if (preg_match('/' . $re0 . '%|_/', $show_grants_dbname) && !preg_match('/\\\\%|\\\\_/', $show_grants_dbname) || !PMA_DBI_try_query('USE ' . preg_replace('/' . $re1 . '(%|_)/', '\\1\\3', $dbname_to_test)) && substr(PMA_DBI_getError(), 1, 4) != 1044) {
                    if ($GLOBALS['cfg']['SuggestDBName']) {
                        $GLOBALS['db_to_create'] = preg_replace('/' . $re0 . '_/', '\\1?', $show_grants_dbname);
                        $GLOBALS['db_to_create'] = preg_replace('/' . $re0 . '%/', '\\1...', $GLOBALS['db_to_create']);
                        $GLOBALS['db_to_create'] = preg_replace('/' . $re1 . '(%|_)/', '\\1\\3', $GLOBALS['db_to_create']);
                    }
                    $GLOBALS['is_create_db_priv'] = true;
//.........这里部分代码省略.........

<?php
/* vim: set expandtab sw=4 ts=4 sts=4: */
/**
 *
 * @version $Id: mysql_charsets.lib.php 30792 2010-03-05 22:55:26Z mehrwert $
 * @package phpMyAdmin
 */
if (! defined('PHPMYADMIN')) {
    exit;
}

/**
 *
 */

if (! PMA_cacheExists('mysql_charsets_count', true)) {
    $res = PMA_DBI_query('SHOW CHARACTER SET;');

    $mysql_charsets = array();
    while ($row = PMA_DBI_fetch_assoc($res)) {
        $mysql_charsets[] = $row['Charset'];
        // never used
        //$mysql_charsets_maxlen[$row['Charset']] = $row['Maxlen'];
        $mysql_charsets_descriptions[$row['Charset']] = $row['Description'];
    }
    PMA_DBI_free_result($res);

    $mysql_charsets_count = count($mysql_charsets);
    sort($mysql_charsets, SORT_STRING);

    $mysql_collations = array_flip($mysql_charsets);

/**
 * returns true (int > 0) if current user is superuser
 * otherwise 0
 *
 * @return bool Whether use is a superuser
 */
function PMA_isSuperuser()
{
    if (PMA_cacheExists('is_superuser', true)) {
        return PMA_cacheGet('is_superuser', true);
    }
    // when connection failed we don't have a $userlink
    if (isset($GLOBALS['userlink'])) {
        if (PMA_DRIZZLE) {
            // Drizzle has no authorization by default, so when no plugin is
            // enabled everyone is a superuser
            // Known authorization libraries: regex_policy, simple_user_policy
            // Plugins limit object visibility (dbs, tables, processes), we can
            // safely assume we always deal with superuser
            $r = true;
        } else {
            // check access to mysql.user table
            $r = (bool) PMA_DBI_try_query('SELECT COUNT(*) FROM mysql.user', $GLOBALS['userlink'], PMA_DBI_QUERY_STORE);
        }
        PMA_cacheSet('is_superuser', $r, true);
    } else {
        PMA_cacheSet('is_superuser', false, true);
    }
    return PMA_cacheGet('is_superuser', true);
}