<?php
$line = __LINE__ + 1; // use this right before the line you want to tag
// tagged line goes here
echo "the line number we refer to is ".$line;
PD9waHAKICRsaW5lID0gX19MSU5FX18gKyAxOyAvLyB1c2UgdGhpcyByaWdodCBiZWZvcmUgdGhlIGxpbmUgeW91IHdhbnQgdG8gdGFnCiAvLyB0YWdnZWQgbGluZSBnb2VzIGhlcmUKIGVjaG8gInRoZSBsaW5lIG51bWJlciB3ZSByZWZlciB0byBpcyAiLiRsaW5lOw==