Nginx serves .php files as downloads, instead of executing them

I solved my problem now with this code (change your IP):

location / {
access_log off;
log_not_found off;
client_max_body_size 2000m;
client_body_buffer_size 512k;
proxy_buffering on;
proxy_send_timeout 300s;
proxy_read_timeout 300s;
proxy_buffer_size 64k;
proxy_buffers 32 64k;
proxy_busy_buffers_size 128k;
proxy_temp_file_write_size 128k;
proxy_connect_timeout 300s;
proxy_http_version 1.1;
proxy_set_header Range "";
proxy_pass

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;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $scheme;
proxy_redirect off;
}