SPL 函数

class_implements — 返回指定的类实现的所有接口。
class_parents — 返回指定类的父类。
class_uses — Return the traits used by the given class
iterator_apply — 为迭代器中每个元素调用一个用户自定义函数
iterator_count — 计算迭代器中元素的个数
iterator_to_array — 将迭代器中的元素拷贝到数组
spl_autoload_call — 尝试调用所有已注册的__autoload()函数来装载请求类
spl_autoload_extensions — 注册并返回spl_autoload函数使用的默认文件扩展名。
spl_autoload_functions — 返回所有已注册的__autoload()函数。
spl_autoload_register — 注册给定的函数作为 __autoload 的实现
spl_autoload_unregister — 注销已注册的__autoload()函数
spl_autoload — __autoload()函数的默认实现
spl_classes — 返回所有可用的SPL类
spl_object_hash — 返回指定对象的hash id

用户评论:

[#1] benny at whitewashing dot de [2008-07-22 09:56:04]

I have to correct my implementation from before. The example before only supported correct read-access but failed on setting new values after creation of the ArrayMultiObject. Also i had to correct a bug that occured from my CopyPasteChange into the comment textarea.

This snippet now hopefully implements a fully functional multidimensional array, represented by an ArrayObject:

<?php class ArrayMultiObject extends ArrayObject { function __construct($array, $flags = 0, $iterator_class = "ArrayIterator") { $objects = array(); foreach($array AS $key => $value) { if(is_array($value)) { $objects[$key] = new ArrayMultiObject($value, $flags, $iterator_class); } else { $objects[$key] = $value; } } parent::__construct($objects, $flags, $iterator_class); } public function offsetSet($name, $value) { if(is_array($value)) { $value = new ArrayMultiObject($value); } return parent::offsetSet($name, $value); } } ?>

[#2] loaded67 at hotmail dot com [2008-05-19 13:56:54]

For some application I needed to reverse some standard iterators.

So I mocked up this flexible function.
Enjoy

<?php function reverse_iterator(Iterator $iterator){ $type = get_class($iterator); $array = array_reverse(iterator_to_array($iterator), true); return new $type($array); } ?>

[#3] prometheus - csaba dot dobai at php-sparcle dot hu [2007-09-13 02:33:37]

This code is an example. By using classes like this, you gives a chance to create classes which extends another class but have most of the ability what a class extends ArrayObject (like multiple inheritance):

<?php class foo { public $foo = 'foo'; } // class class foobar extends foo implements ArrayAccess,IteratorAggregate,Countable { public function offsetExists($offset) { $array = array(1, 2, 3, 4); return array_key_exists($offset, $array); } public function offsetGet($offset) { $array = array(1, 2, 3, 4); return $array[$offset]; } public function offsetSet($offset, $value) { // Makes "array" to readonly } public function offsetUnset($offset) { // Makes "array" to readonly } function count() { $array = array(1, 2, 3, 4); return count($array); } // function function getArray() { return array(1, 2, 3, 4); } // function function getIterator() { return new ArrayIterator(array(1, 2, 3, 4)); } // function function __toString() { return 'String test'; } // function } // class $foobar = new foobar(); print $foobar[0].'<br/>'; print $foobar->foo.'<br/>'; print count($foobar).'<br/>'; foreach ($foobar as $k=>$v) { print $k.'=>'.$v.'<br/>'; } // foreach var_dump($foobar->getArray()); print $foobar; ?>

For proper use you must be define all these methods except getArray()

Browse SPL's sources to be a very helpful think.

ps.: sry for my english

[#4] semperluc (at) yahoo._forgot_the_rest [2007-02-01 13:43:54]

<?php // 1. explicity typecast object as array foreach ( new DirectoryIterator('./') as $Item ) { $fname = (array)$Item->getFilename(); $dir_listing[] = $fname[0]; } // echo "<pre>"; print_r($dir_listing); unset($dir_listing); echo"</pre><hr />"; // // or // 2. define array as key => object->method foreach ( new DirectoryIterator('./') as $Item ) { $dir_listing[] = array ( "fname" => $Item->getFilename(), "path" => $Item->getPathname(), "size" => $Item->getSize(), "mtime" => $Item->getMTime() ); } // echo "<pre>"; print_r($dir_listing); unset($dir_listing); echo"</pre>"; // ?>

[#5] kevin at oceania dot net [2006-03-07 00:21:45]

The most comprehensive of all tutorials regarding SPL has been written with some help from Marcus and can be found here.
http://www.phpro.org/tutorials/Introduction-to-SPL.html

Enjoy

[#6] ville</.>witt</a>gmail</.>com [2006-01-12 12:37:26]

These to funtions has excatly the same output, the only diff. is in which directory iterator they use. I hope someone out there can use it:
<?php function listfilesin1 ($dir = ".", $depth=0) { echo "Dir: ".$dir."<br/>"; foreach(new DirectoryIterator($dir) as $file) { if (!$file->isDot()) { if ($file->isDir()) { $newdir = $file->getPathname(); listfilesin1($newdir, $depth+1); } else { echo "($depth)".$file->getPathname() . "<br/>"; } } } } function listfilesin2 ($dir = ".", $depth=0) { echo "Dir: ".$dir."<br/>"; foreach(new RecursiveDirectoryIterator($dir) as $file) { if ($file->hasChildren(false)) { $newdir = $file->key(); listfilesin2($newdir, $depth+1); } else { echo "($depth)".$file->key() . "<br/>"; } } } listfilesin(); ?>

[#7] adove at booyahnetworks dot com [2005-10-10 10:45:37]

Something to note that, at least to me, seems pretty important and is not entirely clear in the documentation is the fact that the ArrayObject class supports get/set on uni-dimensional keys and get ONLY on *passed* multi-dimensional keys/paths (see source below). If you, like me, need to support array accesss overloading for multi-dimensional data, you will need to derive from ArrayObject and overide the ArrayAccess interface methods to "walk" passed data and convert embedded arrays to objects of some kind...

Reference Bug 34816 @ http://bugs.php.net/bug.php?id=34816.

Illustration of the issue:

$a = array(
    "test" => array(
        "one" => "dunno",
        "two" => array(
            "peekabo" => "do you see me?",
            "anyone" => array("there")
            )
        )
    );
$oArray = new ArrayObject($a);
var_dump($oArray);

$oArray["three"] = "No problems here.";

echo "\n\\test\\one == " . $oArray["test"]["one"] . "\n\n";

// NEITHER of the two below will work!
$oArray["test"]["one"] = "Yes I do!";
$oArray["test"]["yes"] = array(
    "hello" => "Goodbye!"
    );

var_dump($oArray);

---
Note from the extension author:
Actually there is RecursiveArrayObject and RecursiveArrayIterator to deal with recursive structures. However this does not always solve all multidimensional issues as expected.

[#8] helly at php dot net [2005-09-25 02:41:36]

There is a RecursiveFilterIterator that makes the above code much easier. And then ther is ParentIterator thta is already a filtering recursive iterator that only accepts elements that have children, with a RecursiveDirectoryIterator as inner iterator you would obviously get only the directories. Further more it ensures that it creates the correct children. All in all you simply need to do this:

$it = new RecursiveDirectoryIterator($path);
$it = new ParentIterator($it);
$it = new RecursiveIteratorIteator($it);

foreach($it as $dir => $o) { ... }

[#9] dave at tunasoft dot com [2004-08-10 06:28:25]

There are some interfaces used here that are not documented.  It took a bit to figure this one out, but you can create your own ArrayObject type class (that is, one who's objects can be access using the array [$index] syntax).

Your class must just implement ArrayAccess.  Which has four abstract methods you must define.  For example:

<?php     class Collection Implements ArrayAccess{              protected $array;                  function offsetExists($offset){                          if(isset($this->array[$offset])){                 return TRUE;             }             else{                 return FALSE;             }                      }                  function offsetGet($offset){                          return $this->array[$offset];                      }                  function offsetSet($offset, $value){                          if($offset){                 $this->array[$offset] = $value;             }             else{                 $this->array[] = $value;             }                  }                  function offsetUnset($offset){                  }               } ?>

You'll have to jump through a couple more hoops to get foreach and print_r and the likes to behave properly.  But with just this, you can :

<?php       $col = new Collction();       $col[] = new ObjectX();       $col[] = new ObjectX(123);       echo $col[0]->name;       // etc. ?>

[#10] phil &ampersat; flatnet.net [2004-04-17 15:11:37]

Here's a sample implementation of the RecursiveDirectoryIterator class. It prints a simple treeview of a given directory:
<?php function recurse($it) { echo '<ul>'; for( ; $it->valid(); $it->next()) { if($it->isDir() && !$it->isDot()) { printf('<li class="dir">%s</li>', $it->current()); if($it->hasChildren()) { $bleh = $it->getChildren(); echo '<ul>' . recurse($bleh) . '</ul>'; } } elseif($it->isFile()) { echo '<li class="file">'. $it->current() . ' (' . $it->getSize(). ' Bytes)</li>'; } } echo '</ul>'; } recurse(new RecursiveDirectoryIterator('D:/')); ?>

SPL 函数

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