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How can unexpected characters in strings affect PHP array operations and comparisons?

Unexpected characters in strings can affect PHP array operations and comparisons by causing unexpected behavior due to differences in character encoding or formatting. To solve this issue, it is important to normalize the strings before performing any array operations or comparisons. This can be done by using functions like `mb_convert_encoding()` or `utf8_encode()` to ensure that the strings are in the same format.

php 
$string1 = "Hello, world!";
$string2 = "Hello, world!";

// Normalize strings
$normalized_string1 = utf8_encode($string1);
$normalized_string2 = utf8_encode($string2);

// Perform array operations or comparisons with normalized strings
if ($normalized_string1 === $normalized_string2) {
    echo "Strings are equal.";
} else {
    echo "Strings are not equal.";
}

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