3v4l.org

run code in 300+ PHP versions simultaneously
<?php $name='foo'; $param_foo='hello'; var_dump(${'param_' . $name}, "${'param_' . $name}", "{${'param_' . $name}}");
Output for 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Deprecated: Using ${expr} (variable variables) in strings is deprecated, use {${expr}} instead in /in/aRMaq on line 7 string(5) "hello" string(5) "hello" string(5) "hello"
Output for 7.4.0 - 7.4.33, 8.0.1 - 8.0.30, 8.1.0 - 8.1.28
string(5) "hello" string(5) "hello" string(5) "hello"
preferences:
108.8 ms | 402 KiB | 121 Q