What is the difference between strpos() and stripos() functions in PHP and when should each be used?

The difference between strpos() and stripos() functions in PHP is that strpos() is case-sensitive, meaning it will return the position of the first occurrence of a substring within a string, while stripos() is case-insensitive, meaning it will perform a case-insensitive search. If you need to find the position of a substring within a string regardless of case, you should use stripos(). If you need a case-sensitive search, then use strpos(). 

// Example of using stripos() function
$string = "Hello World";
$subString = "world";

$position = stripos($string, $subString);

if($position !== false) {
    echo "Substring found at position: " . $position;
} else {
    echo "Substring not found";
}

Keywords

strpos stripos PHP string functions case-insensitive

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