Generate a string for testing truncation by bytes/characters

index.php

<?php
/**
 * Generate strings for testing truncation by bytes/characters
 *
 * E.g. paste this into a form field:
 * "€€€€€.... 10....... 20....... 30....... 40....... 50....... 60....... 70....... 80......."
 *
 * If this is returned: "€€€€€.... 10....... 20...." you'll know the system is truncating to either
 * 26 UTF-8 characters or 36 bytes (the five Euros comprise 15 bytes).
 */

$minChars = 150;
$euro = "\xE2\x82\xAC";
$s = str_repeat($euro, 5) . ".... ";
$chars = 10;

while ($chars < $minChars) {
    $s .= (str_pad($chars, 9, '.', STR_PAD_RIGHT) . " ");
    $chars += 10;
}

echo $s;