使用[]时PHP解析错误

The code is

// Get singleton (first value from row with single value)
static function singleton($arg, $params = false) {
    return pg_fetch_row(SQL($arg, $params))[0];
}

The error message is

2014-02-19 12:54:23: (mod_fastcgi.c.2701) FastCGI-stderr: PHP message: PHP Parse error: syntax error, unexpected '[' in /var/www/blockexplorer.com/htdocs/includes/sql.inc on line 69

I think there is a config that can fix it.

This depends on PHP version you are using. If you are using PHP 5.4 or above then your code will not give error otherwise you will have to store the result in a variable and use it.

Reference : PHP 5.4

Look for "Array Dereferencing" here.

Put the result of the function in a variable

static function singleton($arg, $params = false) {
    $foo = pg_fetch_row(SQL($arg, $params));
    return $foo[0];
}

PHP does not support anonymous arrays. Use an named array instead:

static function singleton($arg, $params = false) {
    $row=pg_fetch_row(SQL($arg, $params));
    return $row[0];
}