What are some common methods to remove specific characters from a PHP string?

One common method to remove specific characters from a PHP string is to use the `str_replace()` function. This function allows you to specify the characters you want to remove and replace them with an empty string. Another method is to use the `preg_replace()` function with a regular expression pattern to match and remove the specific characters. Both of these methods provide flexibility in removing characters based on specific criteria.

// Using str_replace() to remove specific characters from a string
$string = "Hello, World!";
$chars_to_remove = array(",", "!");
$new_string = str_replace($chars_to_remove, "", $string);
echo $new_string;

// Using preg_replace() with a regular expression to remove specific characters from a string
$string = "Hello, World!";
$chars_to_remove = "/[,!]/";
$new_string = preg_replace($chars_to_remove, "", $string);
echo $new_string;