updating the example to inlcude the correct number of appropriate parameters

The php example only has 3 params and returns an error like this:

```
[marpaia@marpaia] php (master):php example.php
Using libinjection 3.6.0pre1

Warning: Wrong parameter count for libinjection_sqli_init() in /home/marpaia/development/libinjection/php/example.php on line 15
```

Applying the submitted patch returns correct output:
```
[marpaia@marpaia] php (master):php example.php
Using libinjection 3.6.0pre1
sqli with fingerprint 1UE1c
```