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How does the str_replace() function in PHP work for finding and replacing specific substrings within a string?

The str_replace() function in PHP works by taking three parameters: the substring to find, the substring to replace it with, and the original string. It then searches for all occurrences of the substring to find within the original string and replaces them with the specified replacement substring. This function is useful for making bulk replacements within a string.

php 
// Example of using str_replace() function
$original_string = "Hello, World!";
$replaced_string = str_replace("Hello", "Hi", $original_string);

echo $replaced_string; // Output: Hi, World!

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