Is it necessary to check for !== false when using strpos in PHP, or can it be omitted?

When using strpos in PHP to check for the existence of a substring within a string, it is necessary to explicitly check for !== false to ensure accurate results. This is because strpos returns false if the substring is not found, but it may also return 0 if the substring is found at the beginning of the string. Therefore, using !== false ensures that you are checking for the specific false value. 

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

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

Keywords

strpos PHP boolean comparison optimization

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