FAQ: Intro to Built-in PHP Functions - String Functions

Frequently Asked Questions PHP FAQ
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This community-built FAQ covers the “String Functions” exercise from the lesson “Intro to Built-in PHP Functions”.

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FAQs on the exercise String Functions

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Why does str_repeat() have an underscore but strrev() and strtolower() are just words smashed together without any separation? Is there a reason the function name formatting is different?

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This bothers me too. I did a bunch of googling and I can’t find any clear answer. The PHP naming convention seems to be “Function names use underscores between words, while class names use both the camelCase and PascalCase rules.” as per their documentation. I assume variable names would be lowercase or lowercase separated by underscores as well. Either way, str_repeat() and strtolower() are functions. The “smashed together” built-in function names are breaking the language’s recommended naming conventions.