csv.php

<?php
// A wrapper around PHP's native CSV functions to allow CSV manipulation without using real files
// Copyright (c) 2017 Daniel Klein

class CSV {
  protected $delimiter;
  protected $enclosure;
  protected $escape;

  protected $data;

  public function __construct($delimiter = ',', $enclosure = '"', $escape = '\\') {
    $this->delimiter = $delimiter;
    $this->enclosure = $enclosure;
    $this->escape = $escape;
  }

  public function fetch_line() {
  }

  public function put_line() {
  }

  public function set_contents($contents, $length = 0) {
    if (!is_string($contents)) {
      throw new Exception('The contents must be a string');
    }
    $fh = fopen('php://temp', 'rw');
    fwrite($fh, $contents);
    rewind($fh);
    $this->data = array();
    $line = fgetcsv($fh, $length, $this->delimiter, $this->enclosure, $this->escape);
    while ($line !== false) {
      $this->data[] = $line;
      $line = fgetcsv($fh, $length, $this->delimiter, $this->enclosure, $this->escape);
    }
    if (!feof($fh)) {
      throw new Exception('An error occurred before the end of the data');
    }
    fclose($fh);
  }

  public function get_contents() {
    $fh = fopen('php://temp', 'rw');
    foreach ($this->data as $datum) {
      fputcsv($fh, $datum, $this->delimiter, $this->enclosure, $this->escape);
    }
    rewind($fh);
    $contents = '';
    while (!feof($fh)) {
      $contents .= fread($fh, 65536);
    }
    fclose($fh);
    return $contents;
  }

  public function set_all($data) {
    if (!is_array($data)) {
      throw new Exception('The data must be an array');
    }
    foreach ($data as $datum) {
      if (!is_array($datum)) {
        throw new Exception('Each line in the data must be an array');
      }
      foreach ($datum as $item) {
        if (!is_string($item)) {
          throw new Exception('Each field must be a string');
        }
      }
    }
    $this->data = $data;
  }

  public function get_all() {
    if (!is_array($this->data)) {
      throw new Exception('No data has been set');
    }
    return $this->data;
  }
}