How can the use of casing in PHP functions like getenv() impact the reliability of the code?

Using inconsistent casing in PHP functions like getenv() can impact the reliability of the code because PHP function names are case-insensitive. This means that using different casings can lead to confusion and errors in the code. To ensure reliability, it is important to use consistent casing when calling PHP functions. 

$value = getenv('MY_VARIABLE'); // Correct casing

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casing PHP functions getenv() reliability code

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