3v4l.org

run code in 300+ PHP versions simultaneously
<?php $foo = 'foo var'; const foo = 'foo_const'; $foo_const = 'dynamic var lookup'; var_dump("${foo}"); var_dump("${(foo)}");
Output for 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
Deprecated: Using ${var} in strings is deprecated, use {$var} instead in /in/uqcjf on line 7 Deprecated: Using ${expr} (variable variables) in strings is deprecated, use {${expr}} instead in /in/uqcjf on line 8 string(7) "foo var" string(18) "dynamic var lookup"
Output for 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33
string(7) "foo var" string(18) "dynamic var lookup"
preferences:
133.69 ms | 408 KiB | 5 Q