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CXVII. Standard PHP Library (SPL) Functions
Wstęp
SPL is a collection of interfaces and classes that are meant to solve standard problems.
Podpowiedź: A more detailed documentation of SPL can be found here.
Instalacja
This extension is available and compiled by default in PHP 5.
Stałe predefinopwane
Poniższe stałe są zdefiniowane w tym rozszerzeniu i stają się dostępne, gdy rozszerzenie jest dokompilowane do PHP, lub załadowane dynamicznie przy starcie.
- Spis treści
- ArrayIterator::current -- Return current array entry
- ArrayIterator::key -- Return current array key
- ArrayIterator::next -- Move to next entry
- ArrayIterator::rewind -- Rewind array back to the start
- ArrayIterator::seek -- Seek to position
- ArrayIterator::valid -- Check whether array contains more entries
- ArrayObject::append -- Appends the value
- ArrayObject::__construct -- Construct a new array object
- ArrayObject::count -- Return the number of elements in the Iterator
- ArrayObject::getIterator -- Create a new iterator from an ArrayObject instance
- ArrayObject::offsetExists -- Returns whether the requested $index exists
- ArrayObject::offsetGet -- Returns the value at the specified $index
- ArrayObject::offsetSet -- Sets the value at the specified $index to $newval
- ArrayObject::offsetUnset -- Unsets the value at the specified $index
- CachingIterator::hasNext -- Check whether the inner iterator has a valid next element
- CachingIterator::next -- Move the iterator forward
- CachingIterator::rewind -- Rewind the iterator
- CachingIterator::__toString -- Return the string representation of the current element
- CachingIterator::valid -- Check whether the current element is valid
- CachingRecursiveIterator::getChildren -- Return the inner iterator's children as a CachingRecursiveIterator
- CachingRecursiveIterator::hasChildren -- Check whether the current element of the inner iterator has children
- DirectoryIterator::__construct -- Constructs a new dir iterator from a path
- DirectoryIterator::current -- Return this (needed for Iterator interface)
- DirectoryIterator::getATime -- Get last access time of file
- DirectoryIterator::getCTime -- Get inode modification time of file
- DirectoryIterator::getChildren -- Returns an iterator for the current entry if it is a directory
- DirectoryIterator::getFilename -- Return filename of current dir entry
- DirectoryIterator::getGroup -- Get file group
- DirectoryIterator::getInode -- Get file inode
- DirectoryIterator::getMTime -- Get last modification time of file
- DirectoryIterator::getOwner -- Get file owner
- DirectoryIterator::getPath -- Return directory path
- DirectoryIterator::getPathname -- Return path and filename of current dir entry
- DirectoryIterator::getPerms -- Get file permissions
- DirectoryIterator::getSize -- Get file size
- DirectoryIterator::getType -- Get file type
- DirectoryIterator::isDir -- Returns true if file is directory
- DirectoryIterator::isDot -- Returns true if current entry is '.' or '..'
- DirectoryIterator::isExecutable -- Returns true if file is executable
- DirectoryIterator::isFile -- Returns true if file is a regular file
- DirectoryIterator::isLink -- Returns true if file is symbolic link
- DirectoryIterator::isReadable -- Returns true if file can be read
- DirectoryIterator::isWritable -- Returns true if file can be written
- DirectoryIterator::key -- Return current dir entry
- DirectoryIterator::next -- Move to next entry
- DirectoryIterator::rewind -- Rewind dir back to the start
- DirectoryIterator::valid -- Check whether dir contains more entries
- FilterIterator::current -- Get the current element value
- FilterIterator::getInnerIterator -- Get the inner iterator
- FilterIterator::key -- Get the current key
- FilterIterator::next -- Move the iterator forward
- FilterIterator::rewind -- Rewind the iterator
- FilterIterator::valid -- Check whether the current element is valid
- LimitIterator::getPosition -- Return the current position
- LimitIterator::next -- Move the iterator forward
- LimitIterator::rewind -- Rewind the iterator to the specified starting offset
- LimitIterator::seek -- Seek to the given position
- LimitIterator::valid -- Check whether the current element is valid
- ParentIterator::getChildren -- Return the inner iterator's children contained in a ParentIterator
- ParentIterator::hasChildren -- Check whether the inner iterator's current element has children
- ParentIterator::next -- Move the iterator forward
- ParentIterator::rewind -- Rewind the iterator
- RecursiveDirectoryIterator::getChildren -- Returns an iterator for the current entry if it is a directory
- RecursiveDirectoryIterator::hasChildren -- Returns whether current entry is a directory and not '.' or '..'
- RecursiveDirectoryIterator::key -- Return path and filename of current dir entry
- RecursiveDirectoryIterator::next -- Move to next entry
- RecursiveDirectoryIterator::rewind -- Rewind dir back to the start
- RecursiveIteratorIterator::current -- Access the current element value
- RecursiveIteratorIterator::getDepth -- Get the current depth of the recursive iteration
- RecursiveIteratorIterator::getSubIterator -- The current active sub iterator
- RecursiveIteratorIterator::key -- Access the current key
- RecursiveIteratorIterator::next -- Move forward to the next element
- RecursiveIteratorIterator::rewind -- Rewind the iterator to the first element of the top level inner iterator
- RecursiveIteratorIterator::valid -- Check whether the current position is valid
- SimpleXMLIterator::current -- Return current SimpleXML entry
- SimpleXMLIterator::getChildren -- Returns an iterator for the current entry if it is a SimpleXML object
- SimpleXMLIterator::hasChildren -- Returns whether current entry is a SimpleXML object
- SimpleXMLIterator::key -- Return current SimpleXML key
- SimpleXMLIterator::next -- Move to next entry
- SimpleXMLIterator::rewind -- Rewind SimpleXML back to the start
- SimpleXMLIterator::valid -- Check whether SimpleXML contains more entries
- class_implements -- Return the interfaces which are implemented by the given class
- class_parents -- Return the parent classes of the given class
- iterator_count -- Count the elements in an iterator
- iterator_to_array -- Copy the iterator into an array
- spl_classes -- Return available SPL classes
| Poprzedni | Spis treści | Następny |
| socket_write | Początek rozdziału | ArrayIterator::current |
Język PHP to dzisiaj powszechnie przyjęty standard, podstawa tworzenia dynamicznych stron WWW, opartych na bazach danych.
PHP to język skryptowy. Znaczy to, że jest to język nie kompilowalny. Program jest wykonywany przez interpreter na podstawie jego kodu źródłowego. Język PHP to element technologii internetowej SERVER-SIDE. Znaczy to, że kod języka jest wykonywany od strony serwera (na serwerze).
W jakim celu używac PHP? Po co to komu?
Załóżmy, że potrzebujemy takiej strony internetowej, która wyświetli zawsze bieżącą datę. Dzięki technologii PHP, datę i godzinę odczytywać można z miejsca gdzie wykonuje się skrypt, np. gdy serwer znajduje się w USA a my w Polsce to widoczna jest różnica w czasie który zostanie wyświetlony.
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