3v4l.org

run code in 300+ PHP versions simultaneously
<?php $A=$_REQUEST['A']; $B=$_REQUEST['B']; $C=$_REQUEST['C']; $X=0; &X=(-$B+sqrt($B*$B-4*$A*$C))/(2*$A); echo "El resultado es: $X" ?>
Output for 5.3.0 - 5.3.27, 5.4.0 - 5.4.21
Parse error: syntax error, unexpected '&' in /in/90ei5 on line 7
Process exited with code 255.
preferences:
197.75 ms | 1395 KiB | 57 Q