What are some common pitfalls when using str_replace() in PHP?

One common pitfall when using str_replace() in PHP is not accounting for case sensitivity. By default, str_replace() is case-sensitive, so if you're trying to replace a string but the case doesn't match exactly, the replacement won't occur. To solve this issue, you can use the str_ireplace() function instead, which is case-insensitive.

// Using str_ireplace() to perform a case-insensitive replacement
$string = "Hello World";
$new_string = str_ireplace("hello", "Hi", $string);
echo $new_string; // Output: Hi World