3v4l.org

run code in 300+ PHP versions simultaneously
<form action="" method="post"> <input type="checkbox" name="friend" value="1"> <input type="submit" value="Go"> </form> <?php if(isset($_POST)) { echo $_POST['friend']; }
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
<form action="" method="post"> <input type="checkbox" name="friend" value="1"> <input type="submit" value="Go"> </form> Warning: Undefined array key "friend" in /in/hDGVa on line 8
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.33
<form action="" method="post"> <input type="checkbox" name="friend" value="1"> <input type="submit" value="Go"> </form> Notice: Undefined index: friend in /in/hDGVa on line 8
Output for 7.3.32 - 7.3.33
<form action="" method="post"> <input type="checkbox" name="friend" value="1"> <input type="submit" value="Go"> </form>
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
<form action="" method="post"> <input type="checkbox" name="friend" value="1"> <input type="submit" value="Go"> </form> Notice: Undefined index: friend in /in/hDGVa on line 8

preferences:
220.38 ms | 402 KiB | 329 Q