3v4l.org

run code in 300+ PHP versions simultaneously
<?php function foo() { $var = 'help'; $string = "${var}"; }
Output for 8.2.0 - 8.2.29, 8.3.0 - 8.3.27, 8.4.1 - 8.4.14
Deprecated: Using ${var} in strings is deprecated, use {$var} instead in /in/Tj2U5 on line 5
Output for 7.4.0 - 7.4.33, 8.0.1 - 8.0.30, 8.1.0 - 8.1.33
preferences:
143.92 ms | 407 KiB | 5 Q