Are there any potential pitfalls to avoid when comparing strings in PHP for word presence?

When comparing strings in PHP for word presence, one potential pitfall to avoid is case sensitivity. If you want to check if a specific word exists in a string regardless of its case, you should convert both the string and the word to lowercase before comparison. This ensures that the comparison is case-insensitive and will accurately detect the presence of the word. 

$string = "Hello World";
$word = "hello";

if (stripos(strtolower($string), strtolower($word)) !== false) {
    echo "The word exists in the string.";
} else {
    echo "The word does not exist in the string.";
}

Keywords

string comparison PHP strpos function case sensitivity false positives

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