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<?php
declare(strict_types=1);
class FileUtil
{
/**
* Return contents of given file as string, but only read up to maxBytes bytes.
*
* @param string $file file to read
* @param int $maxBytes maximum length to read
* @return false|string data, false on error
*/
public static function readFile(string $file, int $maxBytes = 1000)
{
$fh = @fopen($file, 'rb');
if ($fh === false)
return false;
$data = fread($fh, $maxBytes);
fclose($fh);
return $data;
}
/**
* Read a file of key=value lines to assoc array.
*
* @param string $file Filename
* @return ?array assoc array, null on error
*/
public static function fileToArray(string $file): ?array
{
$data = self::readFile($file, 2000);
if ($data === false)
return null;
$data = explode("\n", str_replace("\r", "\n", $data));
$ret = array();
foreach ($data as $line) {
if (preg_match('/^(\w+)\s*=\s*(.*?)\s*$/', $line, $out)) {
$ret[$out[1]] = $out[2];
}
}
return $ret;
}
/**
* Write given associative array to file as key=value pairs.
*
* @param string $file Filename
* @param array $array Associative array to write
* @return boolean success of operation
*/
public static function arrayToFile(string $file, array $array): bool
{
$fh = fopen($file, 'wb');
if ($fh === false)
return false;
foreach ($array as $key => $value) {
if (false === fwrite($fh, $key . ' = ' . preg_replace('/[\x00-\x1F]/s', '', (string)$value) . "\n")) {
fclose($fh);
return false;
}
}
fclose($fh);
return true;
}
}
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