什么是PHP中函数字符串的正确语法样式

Question

I'm learning php, and i notice its an extreme rich language with string related functions. Something i've not seen in other languages is the code below, i know its basics. But what i wonder what is the common syntax style, to use for this.

I just used f_...... to declare a function that is already usable.

And i used sf_...... to put a function into its string callable form.

I also tend to use a_ for arrays etc. But i am wondered is there some kind of popular standard. With popular i mean used often but doesnt need to be compliant to specific complex norms. i would just like to achive that other coders find it easy to read.

    function f_RedText($a){ return "<font size='+1' color='#ff0000'>$a</font>";}
    $sf_redtext = "f_RedText";
    echo $sf_redtext("Peter");

Answer 1

It doesn't exactly fit your question but is a more general approach to coding guidelines in PHP.

Have a look at PSR-1 and PSR-2

Edit

or Zend or PEAR or Nette (hat tip to @DanFromGermany for comment ;))

Answer 2

You can use what you think, keeping mind the php documentation. If you wrote function f_RedText($a) then its ok. Developers use as they want to use. There is nothing standard pattern that all good developers have to follow.