String in PHP

String Functions
str_replace ->
strpos ->
str_repeat ->
strrev ->
implode ->
strstr ->
strtolower ->
strtoupper ->
rand ->
unique ->
number_format ->
ciel ->
floor ->
abs ->
round ->
add_slashes ->
strip_slashes ->
strip_tags ->
strip ->
nl2br -> convert "\n" into html <br> tag
strlen -> Get the length of string, its retutn type is Int
ucwords -> Uppercase First Char of every word
ucfirst -> Uppercase first char of string