How does the use of !== false improve the reliability of strpos() function in PHP?

When using the strpos() function in PHP to find the position of a substring within a string, it is important to consider that the function may return 0 if the substring is found at the beginning of the string. However, 0 is considered falsy in PHP, so using !== false instead of just checking the return value can improve the reliability of the function by ensuring that false is only returned if the substring is not found at all. 

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

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

Keywords

PHP strpos() !== false reliability improve

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