问题描述
我在此处 https://github.com/box/spout 下载了Box/Spout ，但是我有启动Spout时遇到问题.我将文件复制到WAMP的文件夹中.
I downloaded Box / Spout here https://github.com/box/spout but I have a problem to launch Spout.I copied the file to the folder of WAMP.
<?php
use Box\Spout\Writer\WriterFactory;
use Box\Spout\Common\Type;
$writer = WriterFactory::create(Type::XLSX);
$writer->openToBrowser($fileName); // stream data directly to the browser
$writer->addRows($multipleRows); // add multiple rows at a time
$writer->close();
?>
我创建了文件index.php，Spout文件位于文件夹WWW/Spout/Box/Common，Reader和Writer中.我有这个错误:
I created the file index.php and Spout files are in the folder WWW/Spout/Box/Common, Reader and Writer. And I have this error:
问题出在哪里?
推荐答案
下载文件还不够.如果您不使用Composer(建议使用Spout的方式)，则需要添加一个额外的自动加载器(它将自动为您加载类).由于Spout符合PSR4，因此自动加载其类并不难.
Downloading the files is not enough. If you don't use Composer (which is the recommended way to use Spout), you need to add an additional autoloader (that will autoload the classes for you). Since Spout is PSR4 compliant, autoloading its classes is not really hard.
以下是一些可用于自动加载Spout类的工作代码:
Here is some working code that you can use to autoload Spout classes:
Psr4Autoloader.php
<?php
namespace Autoloader;
class Psr4Autoloader
{
/**
* An associative array where the key is a namespace prefix and the value
* is an array of base directories for classes in that namespace.
*
* @var array
*/
protected $prefixes = array();
/**
* Register loader with SPL autoloader stack.
*
* @return void
*/
public function register()
{
spl_autoload_register(array($this, 'loadClass'));
}
/**
* Adds a base directory for a namespace prefix.
*
* @param string $prefix The namespace prefix.
* @param string $base_dir A base directory for class files in the
* namespace.
* @param bool $prepend If true, prepend the base directory to the stack
* instead of appending it; this causes it to be searched first rather
* than last.
* @return void
*/
public function addNamespace($prefix, $base_dir, $prepend = false)
{
// normalize namespace prefix
$prefix = trim($prefix, '\\') . '\\';
// normalize the base directory with a trailing separator
$base_dir = rtrim($base_dir, DIRECTORY_SEPARATOR) . '/';
// initialize the namespace prefix array
if (isset($this->prefixes[$prefix]) === false) {
$this->prefixes[$prefix] = array();
}
// retain the base directory for the namespace prefix
if ($prepend) {
array_unshift($this->prefixes[$prefix], $base_dir);
} else {
array_push($this->prefixes[$prefix], $base_dir);
}
}
/**
* Loads the class file for a given class name.
*
* @param string $class The fully-qualified class name.
* @return mixed The mapped file name on success, or boolean false on
* failure.
*/
public function loadClass($class)
{
// the current namespace prefix
$prefix = $class;
// work backwards through the namespace names of the fully-qualified
// class name to find a mapped file name
while (false !== $pos = strrpos($prefix, '\\')) {
// retain the trailing namespace separator in the prefix
$prefix = substr($class, 0, $pos + 1);
// the rest is the relative class name
$relative_class = substr($class, $pos + 1);
// try to load a mapped file for the prefix and relative class
$mapped_file = $this->loadMappedFile($prefix, $relative_class);
if ($mapped_file) {
return $mapped_file;
}
// remove the trailing namespace separator for the next iteration
// of strrpos()
$prefix = rtrim($prefix, '\\');
}
// never found a mapped file
return false;
}
/**
* Load the mapped file for a namespace prefix and relative class.
*
* @param string $prefix The namespace prefix.
* @param string $relative_class The relative class name.
* @return mixed Boolean false if no mapped file can be loaded, or the
* name of the mapped file that was loaded.
*/
protected function loadMappedFile($prefix, $relative_class)
{
// are there any base directories for this namespace prefix?
if (isset($this->prefixes[$prefix]) === false) {
return false;
}
// look through base directories for this namespace prefix
foreach ($this->prefixes[$prefix] as $base_dir) {
// replace the namespace prefix with the base directory,
// replace namespace separators with directory separators
// in the relative class name, append with .php
$file = $base_dir
. str_replace('\\', '/', $relative_class)
. '.php';
// if the mapped file exists, require it
if ($this->requireFile($file)) {
// yes, we're done
return $file;
}
}
// never found it
return false;
}
/**
* If a file exists, require it from the file system.
*
* @param string $file The file to require.
* @return bool True if the file exists, false if not.
*/
protected function requireFile($file)
{
if (file_exists($file)) {
require $file;
return true;
}
return false;
}
}
autoload.php
<?php
require_once "Psr4Autoloader.php";
$loader = new \Autoloader\Psr4Autoloader;
$loader->register();
$loader->addNamespace('Box\Spout', 'vendor/box/spout/src/Spout');
将这两个文件添加到项目后，请确保autoload.php中的 require_once 路径正确无误，最后添加 require_once"path/to/autoload.php" 放在根文件(例如 index.php )中，或者在您认为更合适的位置.
Once you have added these 2 files to your project, make sure that the require_once path is correct in autoload.php and finally add require_once "path/to/autoload.php" in your root file (like index.php) or wherever you think it's more appropriate.
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