<?php
$proj_id = 42;
?>
when you are inside html:
<a href="index.php?proj_id=<?=$proj_id; ?>">back to project</a>
when you're in php:
<?php
echo "<a href='index.php?proj_id={$proj_id}'>back to project</a>";
echo "\n\nOr:\n\n";
echo "<a href='index.php?proj_id=${proj_id}'>back to project</a>";
echo "\n\nOr:\n\n";
echo "<a href='index.php?proj_id=$proj_id'>back to project</a>";
?>
If it was Twig (but it isn't):
<a href="index.php?proj_id={{proj_id}}">back to project</a>
Deprecated: Using ${var} in strings is deprecated, use {$var} instead in /in/q3vUR on line 17
when you are inside html:
<a href="index.php?proj_id=42">back to project</a>
when you're in php:
<a href='index.php?proj_id=42'>back to project</a>
Or:
<a href='index.php?proj_id=42'>back to project</a>
Or:
<a href='index.php?proj_id=42'>back to project</a>
If it was Twig (but it isn't):
<a href="index.php?proj_id={{proj_id}}">back to project</a>
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0
Deprecated: Using ${var} in strings is deprecated, use {$var} instead in /in/q3vUR on line 17
when you are inside html:
<a href="index.php?proj_id=42">back to project</a>
when you're in php:
<a href='index.php?proj_id=42'>back to project</a>
Or:
<a href='index.php?proj_id=42'>back to project</a>
Or:
<a href='index.php?proj_id=42'>back to project</a>
If it was Twig (but it isn't):
<a href="index.php?proj_id={{proj_id}}">back to project</a>
when you are inside html:
<a href="index.php?proj_id=42">back to project</a>
when you're in php:
<a href='index.php?proj_id=42'>back to project</a>
Or:
<a href='index.php?proj_id=42'>back to project</a>
Or:
<a href='index.php?proj_id=42'>back to project</a>
If it was Twig (but it isn't):
<a href="index.php?proj_id={{proj_id}}">back to project</a>