Recent content by Knowledge is Key

in all my text fields on my website should I use strip_tags(mysql_real_escape_string($_POST['blah']));

when I run my php script to get the id3 of a file: <?php $tag = id3_get_tag( "song.mp3" ); print_r($tag); ?> I get the error: Fatal error: Call to undefined function id3_get_tag()

Ive mastered HTML and CSS and know the basics of PHP but im not sure if I should continue with PHP and try to get good at it or move on to ruby. I've been looking at ruby and on the face of things it looks easier than php so what should I do

I know you use php to "echo" the html but why not just make it with html