In what scenarios would using functions like stristr(), strpos(), and substr be appropriate for manipulating strings in PHP?
When working with strings in PHP, functions like stristr(), strpos(), and substr can be useful for manipulating strings. For example, if you need to find the position of a substring within a larger string, you can use strpos(). If you need to extract a portion of a string, you can use substr(). And if you need to perform a case-insensitive search for a substring within a string, you can use stristr().
// Example of using strpos() to find the position of a substring within a string
$string = "Hello, world!";
$substring = "world";
$position = strpos($string, $substring);
echo "Position of '$substring' in '$string' is: $position";
// Example of using substr() to extract a portion of a string
$string = "Hello, world!";
$substring = substr($string, 7);
echo "Substring: $substring";
// Example of using stristr() to perform a case-insensitive search for a substring within a string
$string = "Hello, world!";
$substring = "WORLD";
$position = stristr($string, $substring);
echo "Position of '$substring' in '$string' is: $position";