PHP CSV iterator

csv-iterator.php

<?php
class CsvIterator implements \Iterator
{
    const ROW_SIZE = 4096;

    /**
    * The pointer to the cvs file.
    * @var resource
    * @access protected
    */
    protected $filePointer = NULL;

    /**
    * The current element, which will
    * be returned on each iteration.
    * @var array
    * @access protected
    */
    protected $currentElement = NULL;

    /**
    * The row counter.
    * @var int
    * @access protected
    */
    protected $rowCounter = NULL;

    /**
    * The delimiter for the csv file.
    * @var str
    * @access protected
    */
    protected $delimiter = NULL;

    /**
    * This is the constructor.It try to open the csv file.The method throws an exception
    * on failure.
    *
    * @access public
    * @param str $file The csv file.
    * @param str $delimiter The delimiter.
    *
    * @throws Exception
    */
    public function __construct($file, $delimiter = ',')
    {
        try {
            $this->filePointer = fopen($file, 'rb');
            $this->delimiter = $delimiter;
        } catch (\Exception $e) {
            throw new \Exception('The file "' . $file . '" cannot be read.');
        }
    }

    /**
    * This method resets the file pointer.
    *
    * @access public
    */
    public function rewind()
    {
        $this->rowCounter = 0;
        rewind($this->filePointer);
    }

    /**
    * This method returns the current csv row as a 2 dimensional array
    *
    * @access public
    * @return array The current csv row as a 2 dimensional array
    */
    public function current()
    {
        $this->currentElement = fgetcsv($this->filePointer, self::ROW_SIZE, $this->delimiter);
        $this->rowCounter++;
        
        return $this->currentElement;
    }
    
    /**
    * This method returns the current row number.
    *
    * @access public
    * @return int The current row number
    */
    public function key()
    {
        return $this->rowCounter;
    }
    
    /**
    * This method checks if the end of file is reached.
    *
    * @access public
    * @return boolean Returns true on EOF reached, false otherwise.
    */
    public function next()
    {
        if (is_resource($this->filePointer)) {
            return !feof($this->filePointer);
        }

        return false;
    }
    
    /**
    * This method checks if the next row is a valid row.
    *
    * @access public
    * @return boolean If the next row is a valid row.
    */
    public function valid()
    {
        if (!$this->next()) {
            if (is_resource($this->filePointer)) {
                fclose($this->filePointer);
            }

            return false;
        }

        return true;
    }
}`

You can iterate over a CSV with SplFileObject

This doesn't implement the Iterator interface correctly. Reading the next line should happen in next(), not in current(). This way if someone calls current() twice, they'll get the wrong result.