小于和大于不输出PHP之间的文本

Question

i use (str_replace) function to replace ##ID## in youtube url with this regular expression : (?P<id>[a-z-A-Z_0-9]+) so i use this code to do this :

<?php
  $urlbase = 'https://www.youtube.com/watch?v=##ID##';
  $lastchange = str_replace('##ID##', '(<id>[a-z-A-Z_0-9]+)', $urlbase);
  echo $lastchange;
?>

i get the output in the browser like this : https://www.youtube.com/watch?v=(?P[a-z-A-Z_0-9]+), its looks like <id> not show up !

i try this simple code :

<?php
 echo "This is my <id>";
?>

but i just get this is my in the browser !

What's the probleme ? and how i can fix it , thanks

Answer 1

is being interpreted as HTML so your browser is parsing it and since it is not a renderable element, it shows nothing. Try:

<?php
  echo "This is my &lt;id&gt;
?>

As for the str_replace, it's doing exactly what the function is supposed to be doing. If you're looking to use regular expressions in string replacements, use preg_replace