3v4l.org

run code in 300+ PHP versions simultaneously
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Output for 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.31, 8.2.0 - 8.2.27, 8.3.0 - 8.3.17, 8.4.1 - 8.4.4
.a { // rules } .a-b, .a-b .b, .a-b.s .x .y, .x { // rules } @a { // rules } @k { // rules }

preferences:
137.34 ms | 412 KiB | 5 Q