在没有编写器的Codeigniter中使用PHPSReadSheet

这是我从中使用的类: https://github.com/php-fig/fig-standards/blob/master/accepted/PSR-4-autoloader-examples.md (我稍微修改了一下)

<?php
if (!defined('BASEPATH')) {
    exit('No direct script access allowed');
}

/**
 * An example of a general-purpose implementation that includes the optional
 * functionality of allowing multiple base directories for a single namespace
 * prefix.
 *
 * Given a foo-bar package of classes in the file system at the following
 * paths ...
 *
 *     /path/to/packages/foo-bar/
 *         src/
 *             Baz.php             # Foo\Bar\Baz
 *             Qux/
 *                 Quux.php        # Foo\Bar\Qux\Quux
 *         tests/
 *             BazTest.php         # Foo\Bar\BazTest
 *             Qux/
 *                 QuuxTest.php    # Foo\Bar\Qux\QuuxTest
 *
 * ... add the path to the class files for the \Foo\Bar\ namespace prefix
 * as follows:
 *
 *      <?php
 *      // instantiate the loader
 *      $loader = new \Example\autoloader_psr4;
 *
 *      // register the autoloader
 *      $loader->register();
 *
 *      // register the base directories for the namespace prefix
 *      $loader->addNamespace('Foo\Bar', '/path/to/packages/foo-bar/src');
 *      $loader->addNamespace('Foo\Bar', '/path/to/packages/foo-bar/tests');
 *
 * The following line would cause the autoloader to attempt to load the
 * \Foo\Bar\Qux\Quux class from /path/to/packages/foo-bar/src/Qux/Quux.php:
 *
 *      <?php
 *      new \Foo\Bar\Qux\Quux;
 *
 * The following line would cause the autoloader to attempt to load the
 * \Foo\Bar\Qux\QuuxTest class from /path/to/packages/foo-bar/tests/Qux/QuuxTest.php:
 *
 *      <?php
 *      new \Foo\Bar\Qux\QuuxTest;
 */
class autoloader_psr4
{

    /**
     * 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;
    }
}

用法:

我将类存储在库中,并像普通库一样加载它。

$this->load->library('autoloader_psr4');
$this->autoloader_psr4->register();
$this->autoloader_psr4->addNamespace('Noodlehaus', APPPATH . 'third_party/config');
$this->autoloader_psr4->addNamespace('Cake\Filesystem', APPPATH . 'third_party/Filesystem');

我有一个项目成功地使用了Symfony不推荐的Psr4ClassLoader: https://github.com/symfony/class-loader/blob/master/Psr4ClassLoader.php

如果需要进行PSR4风格的自动加载,那么使用这个类加载器是非常好的。

例如:

require_once FCPATH . 'Psr4ClassLoader.php';
$loader = new Symfony\Component\ClassLoader\Psr4ClassLoader();
$loader->addPrefix('Skunkbad\Console', FCPATH . 'vendor/skunkbad/console/src');
$loader->register();

在该示例中,我使用了一个控制台类,我可以声明名称空间以及名称空间所在目录的位置。

$c = new Skunkbad\Console\Console('ChromePhp');
$c->log([1,2,3,4,5]);

现在,我可以加载Console类,在本例中,我将“ChromePhp”作为构造函数参数传递。然后,我继续在控制台对象上调用log方法。

在您的情况下,由于命名空间类是PhpOffice\phpspredsheet\Spreadsheet,因此您可能会执行以下操作:

require_once __DIR__ . '/path/to/Psr4ClassLoader.php';
$loader = new Symfony\Component\ClassLoader\Psr4ClassLoader();
$loader->addPrefix('PhpOffice\PhpSpreadsheet', FCPATH . 'vendor/phpoffice/phpspreadsheet/src');
$loader->register();

然后像这样使用它:

$x = new PhpOffice\PhpSpreadsheet\Spreadsheet();

请理解,我不知道使用电子表格类的具体细节,但我将向您展示如何在没有Composer的情况下使用它。您可能需要处理程序包的路径,可能还需要处理名称空间本身。