1. echo strlen("Hello world!"); // 12 2. echo str_word_count("Hello world!"); // 2 3. echo strrev("Hello world!"); // !dlrow olleH 4. echo strpos("Hello world!", "world"); // 6 5. echo str_replace("world", "Dolly", "Hello world!"); // Hello Dolly! $txt1 = "Hello"; $txt2 = " world!"; $txt1 .= $txt2; echo $txt1; // Hello world! |