Online PHP editor | output for 3F6RG

<?php $string = 'Hello {{ name }}, nice to meet you.'; define('TAG_OPEN', '{{'); define('TAG_CLOSE', '}}'); define('STATE_TEXT', 'STATE_TEXT'); define('STATE_IN_TAG', 'STATE_IN_TAG'); function isOpenTag($string, $index) { return TAG_OPEN === substr($string, $index, strlen(TAG_OPEN)); } function isCloseTag($string, $index) { return TAG_CLOSE === substr($string, $index, strlen(TAG_CLOSE)); } function isText($string, $index) { return ! (isOpenTag($string, $index) || isCloseTag($string, $index)); } $state = STATE_TEXT; for($index = 0; $index < strlen($string); $index++) { if (isText($string, $index) && $state != STATE_IN_TAG) { continue; } if (isOpenTag($string, $index)) { $state = STATE_IN_TAG; $index += strlen(TAG_OPEN); continue; } if (isText($string, $index) && $state = STATE_IN_TAG) { echo $index, ' ', $string[$index], PHP_EOL; } if (isCloseTag($string, $index)) { $state = STATE_TEXT; $index += strlen(TAG_CLOSE); continue; } }