strlen() - Return the Length of a String

                                
<?php 
echo strlen(" Hi Hello NUV! "); // outputs 12 
?>

str_word_count() - Count Words in a String

 
<?php 
echo str_word_count(" Hi Hello NUV! "); // outputs 2 
?> 

strrev() - Reverse a String

                             
<?php 
echo strrev(" Hi Hello NUV!"); // outputs !dlrow olleH 
?>

strpos() - Search For a Text Within a String

                               
<?php 
echo strpos(" Hi Hello NUV! ", "NUV"); // outputs 6 
?>

str_replace() - Replace Text Within a String

                               
<?php 
echo str_replace("Nuv", "NUV", " Hi Hello Nuv!!"); // outputs Hello NUV! 
?>