Bash on Ubuntu on Windows php problem

I've tried using PHP, installed in the Ubuntu subsystem on Windows 10, but it works partially.

I create the php.cmd file in PATH, which redirects the PHP command from the command line to bash Ubuntu (after replacing C:\ with /mnt/c/, replacing \ with / and escaping " characters). php.cmd:

@ECHO off
SET cmd=%*
SET cmd=%cmd:C:\=/mnt/c/%
SET cmd=%cmd:\=/%
SET cmd=%cmd:"=\"%
SET cmd=C:\Windows\System32\bash.exe -c "php %cmd%"
CALL %cmd%

This allows me to call from the command line (Windows) any php command (php -v; php "path_to_file"). However, this does not work with the code-runner, it outputs:

[Running] php "c:\temp\test.php"
"C:\Windows\System32\bash.exe" is not recognized as an internal or external command, 
operable program or batch file.

[Done] exited with code=1 in 0.028 seconds

In Windows shell (cmd, powershell) command php "c:\temp\test.php" works fine. What could be the reason?