PHP SplFileObject::seek方法代码示例

 /**
  * Get Code from file
  * @param $path
  * @param $line
  * @param $numLines
  * @return array|null
  */
 private function getCode($path, $line, $numLines)
 {
     if (empty($path) || empty($line) || !file_exists($path)) {
         return NULL;
     }
     try {
         // Get the number of lines in the file
         $file = new \SplFileObject($path);
         $file->seek(PHP_INT_MAX);
         $totalLines = $file->key() + 1;
         // Work out which lines we should fetch
         $start = max($line - floor($numLines / 2), 1);
         $end = $start + ($numLines - 1);
         if ($end > $totalLines) {
             $end = $totalLines;
             $start = max($end - ($numLines - 1), 1);
         }
         // Get the code for this range
         $code = array();
         $file->seek($start - 1);
         while ($file->key() < $end) {
             $code[$file->key() + 1] = rtrim($file->current());
             $file->next();
         }
         return $code;
     } catch (RuntimeException $ex) {
         return null;
     }
 }

 /**
  * {@inheritdoc}
  */
 public function offsetGet($offset)
 {
     $key = $this->file->key();
     $this->file->seek($offset);
     $log = $this->current();
     $this->file->seek($key);
     $this->file->current();
     return $log;
 }

 /**
  * {@inheritdoc}
  */
 public function countLines(\SplFileObject $file)
 {
     // Refresh file size
     clearstatcache($file->getFilename());
     $previous = $file->key();
     $file->seek($file->getSize());
     $count = $file->key();
     $file->seek($previous);
     return $count;
 }

 /**
  * {@inheritdoc}
  */
 public function read()
 {
     if ($this->file->valid()) {
         $this->file->seek($this->getContext()->getReadCount());
         $line = rtrim($this->file->current(), PHP_EOL);
         $this->getContext()->incrementReadCount();
         return json_decode($line, true);
     }
     return null;
 }

 protected function execute(InputInterface $input, OutputInterface $output)
 {
     if (parent::execute($input, $output)) {
         $this->loadOCConfig();
         $properties = array('string $id', 'string $template', 'array $children', 'array $data', 'string $output');
         // TODO: get all library classes as well, maybe extract from registry somehow...
         $searchLine = "abstract class Controller {";
         $pathToController = "engine/controller.php";
         $catalogModels = $this->getModels(\DIR_APPLICATION);
         $adminModels = $this->getModels(str_ireplace("catalog/", "admin/", \DIR_APPLICATION));
         $textToInsert = array_unique(array_merge($properties, $catalogModels, $adminModels));
         //get line number where start Controller description
         $fp = fopen(\DIR_SYSTEM . $pathToController, 'r');
         $lineNumber = $this->getLineOfFile($fp, $searchLine);
         fclose($fp);
         //regenerate Controller text with properties
         $file = new \SplFileObject(\DIR_SYSTEM . $pathToController);
         $file->seek($lineNumber);
         $tempFile = sprintf("<?php %s \t/**%s", PHP_EOL, PHP_EOL);
         foreach ($textToInsert as $val) {
             $tempFile .= sprintf("\t* @property %s%s", $val, PHP_EOL);
         }
         $tempFile .= sprintf("\t**/%s%s%s", PHP_EOL, $searchLine, PHP_EOL);
         while (!$file->eof()) {
             $tempFile .= $file->fgets();
         }
         //write Controller
         $fp = fopen(\DIR_SYSTEM . $pathToController, 'w');
         fwrite($fp, $tempFile);
         fclose($fp);
     }
 }

/**
 * 返回文件从X行到Y行的内容(支持php5、php4)
 * @param  String  $filename  文件名
 * @param  integer $startLine 开始行
 * @param  integer $endLine   结束行
 * @param  string  $method    方法
 * @return array() 返回数组
 */
function readFileByLines($filename, $startLine = 1, $endLine = 50, $method = 'rb')
{
    $content = array();
    $count = $endLine - $startLine;
    // 判断php版本（因为要用到SplFileObject，PHP>=5.1.0）
    if (version_compare(PHP_VERSION, '5.1.0', '>=')) {
        $fp = new SplFileObject($filename, $method);
        // 转到第N行, seek方法参数从0开始计数
        $fp->seek($startLine - 1);
        for ($i = 0; $i <= $count; ++$i) {
            // current()获取当前行内容
            $content[] = $fp->current();
            // 下一行
            $fp->next();
        }
    } else {
        //PHP<5.1
        $fp = fopen($filename, $method);
        if (!$fp) {
            return 'error:can not read file';
        }
        // 跳过前$startLine行
        for ($i = 1; $i < $startLine; ++$i) {
            fgets($fp);
        }
        // 读取文件行内容
        for ($i; $i <= $endLine; ++$i) {
            $content[] = fgets($fp);
        }
        fclose($fp);
    }
    // array_filter过滤：false,null,''
    return array_filter($content);
}

 /**
  * @param \ReflectionFunctionAbstract $reflection
  */
 public function setBodyFromReflection(\ReflectionFunctionAbstract $reflection)
 {
     /** @var $reflection \ReflectionMethod */
     if (is_a($reflection, '\\ReflectionMethod') && $reflection->isAbstract()) {
         $this->_code = null;
         return;
     }
     $file = new \SplFileObject($reflection->getFileName());
     $file->seek($reflection->getStartLine() - 1);
     $code = '';
     while ($file->key() < $reflection->getEndLine()) {
         $code .= $file->current();
         $file->next();
     }
     $begin = strpos($code, 'function');
     $code = substr($code, $begin);
     $begin = strpos($code, '{');
     $end = strrpos($code, '}');
     $code = substr($code, $begin + 1, $end - $begin - 1);
     $code = preg_replace('/^\\s*[\\r\\n]+/', '', $code);
     $code = preg_replace('/[\\r\\n]+\\s*$/', '', $code);
     if (!trim($code)) {
         $code = null;
     }
     $this->setCode($code);
 }

 protected function export($var, $return = false)
 {
     if ($var instanceof Closure) {
         /* dump anonymous function in to plain code.*/
         $ref = new ReflectionFunction($var);
         $file = new SplFileObject($ref->getFileName());
         $file->seek($ref->getStartLine() - 1);
         $result = '';
         while ($file->key() < $ref->getEndLine()) {
             $result .= $file->current();
             $file->next();
         }
         $begin = strpos($result, 'function');
         $end = strrpos($result, '}');
         $result = substr($result, $begin, $end - $begin + 1);
     } elseif (is_object($var)) {
         /* dump object with construct function. */
         $result = 'new ' . get_class($var) . '(' . $this->export(get_object_vars($var), true) . ')';
     } elseif (is_array($var)) {
         /* dump array in plain array.*/
         $array = array();
         foreach ($var as $k => $v) {
             $array[] = var_export($k, true) . ' => ' . $this->export($v, true);
         }
         $result = 'array(' . implode(', ', $array) . ')';
     } else {
         $result = var_export($var, true);
     }
     if (!$return) {
         print $result;
     }
     return $result;
 }

function modifyFileLine($filename, $linenum, $lineText)
{
    $fp = new SplFileObject($filename);
    $fp->seek($linenum);
    $line = $fp->current();
    $fp->fseek($linenum, SEEK_CUR);
    $fp->fwrite($lineText);
}

 /**
  * @param string $expectedContent
  * @param integer $zeroBasedLineNumber
  * @param boolean $trimLine
  * @return void
  */
 private function assertSameContentAtLine($expectedContent, $zeroBasedLineNumber, $trimLine = true)
 {
     $this->fileObject->seek($zeroBasedLineNumber);
     $actualContent = $this->fileObject->current();
     if ($trimLine) {
         $actualContent = trim($actualContent);
     }
     $this->assertSame($expectedContent, $actualContent);
 }

 public function actionIndex()
 {
     Yii::import("application.models.*");
     //get the latest idle cron job
     /* @var $latestidle JobQueue*/
     $latestidle = JobQueue::model()->findByAttributes(array("status" => JobQueue::$JOBQUEUE_STATUS_IDLE));
     if (!$latestidle) {
         echo "No file queued";
         die;
     }
     //set status to on-going
     $latestidle->status = JobQueue::$JOBQUEUE_STATUS_ON_GOING;
     $latestidle->save(false);
     //retrieve file
     $queueFile = new SplFileObject($latestidle->filename);
     //read file
     $queueFile->setFlags(SplFileObject::READ_CSV | SplFileObject::READ_AHEAD | SplFileObject::DROP_NEW_LINE | SplFileObject::SKIP_EMPTY);
     $queueFile->next();
     // Total_records ,
     $queueFile->seek(PHP_INT_MAX);
     $linesTotal = $queueFile->key();
     $latestidle->total_records = $linesTotal;
     $latestidle->save(false);
     $index = 0;
     foreach ($queueFile as $currentLine) {
         //iterate content
         if ($queueFile->key() === 0) {
             continue;
         }
         //TODO: processed_record
         $latestidle->processed_record = ++$index;
         $latestidle->save(false);
         $currentMobile = $currentLine[0];
         $newBlackListedmobile = new BlackListedMobile();
         //cleaning time
         $currentMobile = trim($currentMobile);
         $currentMobile = rtrim($currentMobile);
         $currentMobile = ltrim($currentMobile);
         $newBlackListedmobile->mobile_number = $currentMobile;
         $newBlackListedmobile->queue_id = $latestidle->queue_id;
         //set queueid
         if ($newBlackListedmobile->save()) {
             //save content
             echo "{$newBlackListedmobile->mobile_number} : Saved \n";
         } else {
             echo "{$newBlackListedmobile->mobile_number} : Failed \n";
         }
     }
     //when done
     //set status to done
     $latestidle->status = JobQueue::$JOBQUEUE_STATUS_DONE;
     $latestidle->date_done = date("Y-m-d H:i:s");
     //set done datetime to now()
     $latestidle->save();
     echo "Queue DONE \n";
 }

 /**
  * This method returns the element at the the specified index.
  *
  * @access public
  * @param integer $index                                    the index of the element
  * @return mixed                                            the element at the specified index
  * @throws Throwable\InvalidArgument\Exception              indicates that an index must be an integer
  * @throws Throwable\OutOfBounds\Exception                  indicates that the index is out of bounds
  */
 public function getValue($index)
 {
     if (!$this->hasIndex($index)) {
         throw new Throwable\OutOfBounds\Exception('Unable to get element. Undefined index at ":index" specified', array(':index' => $index));
     }
     $this->reader->seek($index);
     $line = $this->reader->current();
     $value = unserialize($line);
     return $value;
 }

 public function read($id)
 {
     $file = new \SplFileObject($this->filename, "r");
     if ($file->flock(LOCK_EX)) {
         $file->seek($id);
         $data = $file->current();
         $file->flock(LOCK_UN);
     } else {
         return false;
     }
     return $this->mapStringDataToObject($data);
 }

 /**
  * @param $fileName
  * @param $page
  * @param $rows
  * @param string $methord
  * @return array
  */
 public static function getContents($fileName, $page, $rows, $methord = 'rb')
 {
     $content = array();
     $start = ($page - 1) * $rows;
     $fp = new \SplFileObject($fileName, $methord);
     $fp->seek($start);
     for ($i = 0; $i < $rows; ++$i) {
         $content[] = $fp->current();
         $fp->next();
     }
     return array_filter($content);
 }

 public static function setUpBeforeClass()
 {
     $reflection = new ReflectionClass(__NAMESPACE__ . '\\TestClass');
     self::$startLine = $reflection->getStartLine();
     self::$endLine = $reflection->getEndLine();
     self::$testClassCode = NULL;
     /* GetCode as String */
     $file = new \SplFileObject($reflection->getFileName());
     $file->seek(self::$startLine - 1);
     while ($file->key() < $reflection->getEndLine()) {
         self::$testClassCode .= $file->current();
         $file->next();
     }
     self::$testClassCode = rtrim(self::$testClassCode, "\n");
     unset($file);
 }