Auto POST to CSV

post-csv.php

<?php
	function append($data, $i){
		//determine whether this line should have a comma or a newline character
		if ($i != count($data) - 1 ) {
			$append = ',';
		}
		else {
			$append = "\n";
		}

		return $append;
	}

	$redirect = 'http://example.com'; //where the form gets sent on success
	$csvPath = getcwd() . 'example.csv'; // make sure this file exists and is writable

	//check stuffs
	if (!file_exists($csvPath)) {
		die ('File '.$csvPath.' does not exist!');
	}
	if (!is_writable($csvPath)) {
		die ('File '.$csvPath.' must be writable!');
	}

	$fp = fopen($csvPath, 'a');
	$output = ''; //write to this string	

	//asort($_POST);

	if (filesize($csvPath) == 0){
		//this is an empty file, we need to add the column names to the top!
		$i = 0;
		foreach ($_POST as $key => $value) {
			$output .= $key . append($_POST, $i);
			$i++;
		}
	}

	//now write the values
	foreach ($_POST as $key => $value) {
		$i = 0;
		$output .= $value . append($_POST, $i);
		$i++;
	}

	if (fwrite($fp, $output)) {
		fclose($fp);
		header('Location: ' . $redirect);
	}
	else {
		die ('There was an error writing to the file');
	}

?>