Name of PHP function [closed]

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Is there a PHP function that replaces - with _ (underscores) ?

Like

my-name

with

my_name 

---

str_replace('-', '_', $name)

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You need to use the return of str_replace!

$name = str_replace('-', '_', $name);

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There's, but it's not called replace_hyphen, it's str_replace

str_replace('-', '_', $str);

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Use this

str_replace("-", "_", "my-name");