Use <?php as plain text in a .php file? -

i have this.php:

<?php  //some code  ?> here goes text plain text. whenever use <?php in .php file precedes php code parsed , interpreted php. 

as may have guessed, file gives error , refuses run correctly. don't want use html entities result file isn't used html. options other storing string <?php in variable?

generate programatically using string literal.

<?php echo "<?php"; ?>