Delete invisible ASCII chars which can generate errors.

del_invisible_ascii_chars.php

<?php

gc_disable();

$content = file_get_contents("db.csv");
if ($content === false) {
	echo "ERROR: impossible to read the file.";
	die();
}

for($i = 0; $i < strlen($content); $i++) {
	$ascii = ord($content[$i]);

	if (($ascii < 32 or $ascii > 126) and $ascii != 10) {
		$content[$i] = "?";
	}
}

if (file_put_contents("new.csv", $content) === false) {
	echo "ERROR: impossible to write the new file.";
}