PHP coding standards

While we create applications in any language, we tend to follow certain coding conventions. So does this apply to creating applications in PHP as well.

Here is a list of few coding standards that i follow:
1. Use camelCaps for Variable Names
2. Use lowercase for method / function names. For functions with multiple words, an underscore is used as a separator. For e.g. function get_display_text();
3. Use class constants instead of global constants wherever possible, by using the const modifier.
4. Use descriptive variable names in for loops as well.
For e.g. $count instead of $j
for($count=0;$count < 10;$count++){
your code here
}

and many more....

It would also be great if you could also pour in your thoughts on the coding conventions you follow while writing applications in php.