What resources are available in PHP for working with strings?

PHP provides a wide range of built-in functions for working with strings. Some commonly used functions include `strlen()` to get the length of a string, `substr()` to extract a part of a string, `strpos()` to find the position of a substring within a string, `str_replace()` to replace a substring with another substring, and `strtolower()` and `strtoupper()` to convert a string to lowercase or uppercase. 

$string = "Hello, World!";
echo strlen($string); // Output: 13
echo substr($string, 0, 5); // Output: Hello
echo strpos($string, "World"); // Output: 7
echo str_replace("World", "PHP", $string); // Output: Hello, PHP!
echo strtolower($string); // Output: hello, world!
echo strtoupper($string); // Output: HELLO, WORLD!

Keywords

PHP strings functions libraries manipulation

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