3v4l.org

run code in 300+ PHP versions simultaneously
<html> <head> <title>Online PHP Script Execution</title> </head> <body> <form method="POST"> <input type="text" name="txt"> <input type="submit" name="sub"> </form> <?php $var=$_POST['txt']; echo "Hello".$var; ?> </body> </html>
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
<html> <head> <title>Online PHP Script Execution</title> </head> <body> <form method="POST"> <input type="text" name="txt"> <input type="submit" name="sub"> </form> Warning: Undefined array key "txt" in /in/LPMQf on line 11 Hello</body> </html>
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.33
<html> <head> <title>Online PHP Script Execution</title> </head> <body> <form method="POST"> <input type="text" name="txt"> <input type="submit" name="sub"> </form> Notice: Undefined index: txt in /in/LPMQf on line 11 Hello</body> </html>
Output for 7.3.32 - 7.3.33
<html> <head> <title>Online PHP Script Execution</title> </head> <body> <form method="POST"> <input type="text" name="txt"> <input type="submit" name="sub"> </form> Hello</body> </html>
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
<html> <head> <title>Online PHP Script Execution</title> </head> <body> <form method="POST"> <input type="text" name="txt"> <input type="submit" name="sub"> </form> Notice: Undefined index: txt in /in/LPMQf on line 11 Hello</body> </html>

preferences:
246.39 ms | 402 KiB | 456 Q