save_stdin.php

#!/usr/bin/env php
<?php

/**
 * This saves the STDIN output into a file.
 * @author Svetoslav Marinov | http://orbisius.com
 * @see https://stackoverflow.com/questions/14187993/save-large-files-from-php-stdin
 * @see http://www.gregfreeman.io/2013/processing-data-with-php-using-stdin-and-piping/
 */

try {
	$exit_code = 0; // success by default
	$bytes_read = 0;

	if (php_sapi_name() == 'cli') {
		$in = fopen('php://stdin', 'rb');
	} else {
		$in = fopen('php://input', 'rb');
	}

	if (empty($in)) {
		throw new Exception("Cannot open STDIN for reading.");
	}

	$output_file = empty($argv[1]) ? dirname(__FILE__) . '/aaa_stdin_data_capture_' . microtime(true) . '.' . mt_rand(9999, 99999) . '.log' : $argv[1];

	$out = fopen($output_file, 'wb');

	if (empty($out)) {
		throw new Exception("Cannot open output file [$output_file] for writing.");
	}

	$lock_status = flock($out, LOCK_EX); // blocking?

	if (empty($lock_status)) {
		throw new Exception("Cannot lock output file for writing.");
	}

	while (!feof($in)) {
		$buff = fread($in, 8192);
		fwrite($out, $buff);
		$bytes_read += strlen($buff);
	}

	flock($out, LOCK_UN);
	fclose($in);
	fclose($out);
	fwrite(STDERR, "STDERR: Output file: [$output_file]\n");
	fwrite(STDERR, "STDERR: Bytes read: [$bytes_read]\n");
} catch (Exception $e) {
	fwrite(STDERR, $e->getMessage() . "\n");
	$exit_code = 255;
}

exit($exit_code);