File

File.php

<?php
function rstrpos ($haystack, $needle) {
  $size = strlen ($haystack);
  $pos = strpos(strrev($haystack), $needle);
  if ($pos === false) {
    return false;
  }
  return $size - $pos;
}

class File {
  protected $value; // string
  function __construct(string $value) {
    $this->value = $value;
  }
  public function getValue(): string {
    return $this->value;
  }

  // get 'name.txt' when value is './path/to/file/name.txt'
  // get null when value is './path/to/file'. (not has dot in last segment name)
  function get_file_name(): ?string {
    $ary = explode('/', $this->value);
    $result = $ary[count($ary) - 1];
    if(strpos($result, '.') === false) {
      return null;
    }
    return $result;
  }

  // get './path/to/file' when value is './path/to/file/name.txt'
  function get_dir_path(): string {
    if($this->get_file_name() === null) {
      return $this->getValue();
    }
    $last_index = rstrpos($this->getValue(), '/');
    if($last_index === false || $last_index == 0) {
      return $this->getValue();
    }
    return substr($this->getValue(), 0, $last_index - 1);
  }

  function mkdirs_if_not_exists(): bool {
    $p = $this->get_dir_path();
    if(file_exists($p)) {
      return true;
    }
    return mkdir($p, 0777, true);
  }

  function save_text(string $text) {
    if(file_exists($this->getValue())) {
      unlink($this->getValue());
    }
    $this->mkdirs_if_not_exists();
    file_put_contents($this->getValue(), $text);
    chmod($this->getValue(), '0777');
  }

  function exists() {
    return file_exists($this->getValue());
  }

  function load_text() {
    return file_get_contents($this->getValue());
  }
}