3v4l.org

run code in 300+ PHP versions simultaneously
<pre> <?php $a='うえお'; $b='あい'; //あいうえお と出力するためにこの下に処理を追加してください。 $b=$a+$b; echo $b; ?> </pre>
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.7
<pre> Fatal error: Uncaught TypeError: Unsupported operand types: string + string in /in/hu2ne:6 Stack trace: #0 {main} thrown in /in/hu2ne on line 6
Process exited with code 255.
Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
<pre> Warning: A non-numeric value encountered in /in/hu2ne on line 6 Warning: A non-numeric value encountered in /in/hu2ne on line 6 0</pre>
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20
<pre> 0</pre>

preferences:
188.09 ms | 402 KiB | 229 Q