What potential pitfalls should be considered when using the strpos function in PHP?

One potential pitfall when using the strpos function in PHP is that it returns 0 if the substring is found at the beginning of the string. This can lead to incorrect conditional checks if not handled properly. To avoid this issue, you should use the strict comparison operator (===) to check the return value of strpos against false. 

$string = "Hello, world!";
$substring = "Hello";

if (strpos($string, $substring) !== false) {
    echo "Substring found in the string.";
} else {
    echo "Substring not found in the string.";
}

Keywords

strpos PHP string manipulation error handling edge cases

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