php操作共享内存shmop类及简单使用测试（代码）

<?php//类对象namespace Simple\SHM;class Block{ ???/** ????* Holds the system id for the shared memory block ????* ????* @var int ????* @access protected ????*/ ???protected $id; ???/** ????* Holds the shared memory block id returned by shmop_open ????* ????* @var int ????* @access protected ????*/ ???protected $shmid; ???/** ????* Holds the default permission (octal) that will be used in created memory blocks ????* ????* @var int ????* @access protected ????*/ ???protected $perms = 0644; ???/** ????* Shared memory block instantiation ????* ????* In the constructor we‘ll check if the block we‘re going to manipulate ????* already exists or needs to be created. If it exists, let‘s open it. ????* ????* @access public ????* @param string $id (optional) ID of the shared memory block you want to manipulate ????*/ ???public function __construct($id = null) ???{ ???????if($id === null) { ???????????$this->id = $this->generateID(); ???????} else { ???????????$this->id = $id; ???????} ???????if($this->exists($this->id)) { ???????????$this->shmid = shmop_open($this->id, "w", 0, 0); ???????} ???} ???/** ????* Generates a random ID for a shared memory block ????* ????* @access protected ????* @return int System V IPC key generated from pathname and a project identifier ????*/ ???protected function generateID() ???{ ???????$id = ftok(__FILE__, "b"); ???????return $id; ???} ???/** ????* Checks if a shared memory block with the provided id exists or not ????* ????* In order to check for shared memory existance, we have to open it with ????* reading access. If it doesn‘t exist, warnings will be cast, therefore we ????* suppress those with the @ operator. ????* ????* @access public ????* @param string $id ID of the shared memory block you want to check ????* @return boolean True if the block exists, false if it doesn‘t ????*/ ???public function exists($id) ???{ ???????$status = @shmop_open($id, "a", 0, 0); ???????return $status; ???} ???/** ????* Writes on a shared memory block ????* ????* First we check for the block existance, and if it doesn‘t, we‘ll create it. Now, if the ????* block already exists, we need to delete it and create it again with a new byte allocation that ????* matches the size of the data that we want to write there. We mark for deletion, ?close the semaphore ????* and create it again. ????* ????* @access public ????* @param string $data The data that you wan‘t to write into the shared memory block ????*/ ???public function write($data) ???{ ???????$size = mb_strlen($data, ‘UTF-8‘); ???????if($this->exists($this->id)) { ???????????shmop_delete($this->shmid); ???????????shmop_close($this->shmid); ???????????$this->shmid = shmop_open($this->id, "c", $this->perms, $size); ???????????shmop_write($this->shmid, $data, 0); ???????} else { ???????????$this->shmid = shmop_open($this->id, "c", $this->perms, $size); ???????????shmop_write($this->shmid, $data, 0); ???????} ???} ???/** ????* Reads from a shared memory block ????* ????* @access public ????* @return string The data read from the shared memory block ????*/ ???public function read() ???{ ???????$size = shmop_size($this->shmid); ???????$data = shmop_read($this->shmid, 0, $size); ???????return $data; ???} ???/** ????* Mark a shared memory block for deletion ????* ????* @access public ????*/ ???public function delete() ???{ ???????shmop_delete($this->shmid); ???} ???/** ????* Gets the current shared memory block id ????* ????* @access public ????*/ ???public function getId() ???{ ???????return $this->id; ???} ???/** ????* Gets the current shared memory block permissions ????* ????* @access public ????*/ ???public function getPermissions() ???{ ???????return $this->perms; ???} ???/** ????* Sets the default permission (octal) that will be used in created memory blocks ????* ????* @access public ????* @param string $perms Permissions, in octal form ????*/ ???public function setPermissions($perms) ???{ ???????$this->perms = $perms; ???} ???/** ????* Closes the shared memory block and stops manipulation ????* ????* @access public ????*/ ???public function __destruct() ???{ ???????shmop_close($this->shmid); ???}}

<?php//测试使用代码namespace Simple\SHM\Test;use Simple\SHM\Block;class BlockTest extends \PHPUnit_Framework_TestCase{ ???public function testIsCreatingNewBlock() ???{ ???????$memory = new Block; ???????$this->assertInstanceOf(‘Simple\\SHM\\Block‘, $memory); ???????$memory->write(‘Sample‘); ???????$data = $memory->read(); ???????$this->assertEquals(‘Sample‘, $data); ???} ???public function testIsCreatingNewBlockWithId() ???{ ???????$memory = new Block(897); ???????$this->assertInstanceOf(‘Simple\\SHM\\Block‘, $memory); ???????$this->assertEquals(897, $memory->getId()); ???????$memory->write(‘Sample 2‘); ???????$data = $memory->read(); ???????$this->assertEquals(‘Sample 2‘, $data); ???} ???public function testIsMarkingBlockForDeletion() ???{ ???????$memory = new Block(897); ???????$memory->delete(); ???????$data = $memory->read(); ???????$this->assertEquals(‘Sample 2‘, $data); ???} ???public function testIsPersistingNewBlockWithoutId() ???{ ???????$memory = new Block; ???????$this->assertInstanceOf(‘Simple\\SHM\\Block‘, $memory); ???????$memory->write(‘Sample 3‘); ???????unset($memory); ???????$memory = new Block; ???????$data = $memory->read(); ???????$this->assertEquals(‘Sample 3‘, $data); ???}}

<?php $memory = new SimpleSHM;$memory->write(‘Sample‘);echo $memory->read(); ?>

<?php $new = new SimpleSHM(897);$new->write(‘Sample‘);echo $new->read(); ?>

<?php require(‘SimpleSHM.class.php‘); $results = array( ???‘user‘ => ‘John‘, ???‘password‘ => ‘123456‘, ???‘posts‘ => array(‘My name is John‘, ‘My name is not John‘)); $data = json_encode($results); $memory = new SimpleSHM;$memory->write($data);$storedarray = json_decode($memory->read()); print_r($storedarray); ?>