flatpress/fp-includes/core/core.fileio.php

<?php

// fileio.php
// low-level io-handling functions
function io_write_file($filename, $data) {
	@umask(0);
	$dir = dirname($filename);
	if (fs_mkdir($dir)) {
		$f = fopen($filename, "w");
		if ($f) {

			if (!flock($f, LOCK_EX))
				return -1;

			$length = strlen($data);
			$done = fwrite($f, $data);

			flock($f, LOCK_UN);

			fclose($f);

			@chmod($filename, FILE_PERMISSIONS);

			// returns true on success

			return ($length == $done);
		}
	}

	return false;
}

function io_load_file($filename) {
	if (file_exists($filename)) {
		if (function_exists('file_get_contents'))
			return file_get_contents($filename);

		$f = fopen($filename, "r");
		if ($f) {
			if (!flock($f, LOCK_SH))
				return -1;
			$contents = fread($f, filesize($filename));
			flock($f, LOCK_UN);
			fclose($f);

			// returns contents as string on success
			return ($contents);
		}
	}
	// trigger_error("io_load_file: $filename does not exists", E_USER_ERROR);
	return false;
}

function io_delete_file($filename) {
	if (!file_exists($filename)) {
		return false;
	}
	return unlink($filename);
}