mock_php_input_stream.php

<?php

class MockPhpStream
{
	protected $index = 0;
	protected $length = null;
	protected $data = '';

	public $context;

	function __construct()
	{
		if (file_exists($this->buffer_filename())) {
			$this->data = file_get_contents($this->buffer_filename());
		} else {
			$this->data = '';
		}
		$this->index = 0;
		$this->length = strlen($this->data);
	}

	protected function buffer_filename()
	{
		return sys_get_temp_dir() . '\php_input.txt';
	}

	function stream_open($path, $mode, $options, &$opened_path)
	{
		return true;
	}

	function stream_close()
	{
	}

	function stream_stat()
	{
		return array();
	}

	function stream_flush()
	{
		return true;
	}

	function stream_read($count)
	{
		if (is_null($this->length) === TRUE) {
			$this->length = strlen($this->data);
		}
		$length = min($count, $this->length - $this->index);
		$data = substr($this->data, $this->index);
		$this->index = $this->index + $length;
		return $data;
	}

	function stream_eof()
	{
		return ($this->index >= $this->length ? TRUE : FALSE);
	}

	function stream_write($data)
	{
		return file_put_contents($this->buffer_filename(), $data);
	}

	function unlink()
	{
		if (file_exists($this->buffer_filename())) {
			unlink($this->buffer_filename());
		}
		$this->data = '';
		$this->index = 0;
		$this->length = 0;
	}
}

$existed = in_array('php', stream_get_wrappers());
if ($existed) {
	stream_wrapper_unregister('php');
}
stream_wrapper_register('php', 'MockPhpStream');
$input_data = 'test';
file_put_contents('php://input', $input_data);
$read_data = file_get_contents('php://input');
stream_wrapper_restore('php');

var_dump($read_data);