When using str_replace or preg_replace in PHP to modify strings, what are some potential pitfalls to be aware of?

One potential pitfall when using str_replace or preg_replace in PHP is that they are case-sensitive by default. This means that if you are looking to replace a string regardless of its case, you will need to use a case-insensitive flag. To do this, you can add 'i' as the fourth parameter in str_replace or as the third parameter in preg_replace. 

// Using str_replace with case-insensitive flag
$new_string = str_replace('search', 'replace', $original_string, $count);

// Using preg_replace with case-insensitive flag
$new_string = preg_replace('/search/i', 'replace', $original_string);

Keywords

str_replace preg_replace PHP strings modification

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