String functions in PHP

Function(Parameters)	Description
ltrim(string)	Strips Whitespace From the Left Side of a String
rtrim(string)	Strips Whitespace From the Right Side of a String
trim(string)	Strips Whitespace From Both Sides of a String
lcfirst(string)	Makes a String's First Character Lowercase
ucfirst(string)	Makes a String's First Character Uppercase
strtolower(string)	Converts a String to Lowercase Letters
strtoupper(string)	Converts a String to Uppercase Letters
str_word_count(string)	Count the Number of Words In a String
ucwords(string)	Makes the First Character of Each Word In a String Uppercase
wordwrap(string, width, break)	Wraps a String to a Given Number of Characters (Default Width: 75) (Default Break: \n)
count_chars(string)	Returns How Many Times an ASCII Character Occurs Within a String & Returns the Information
substr_count(string, substring)	Counts the Number of Times a Substring Occurs In a String
strlen(string)	Returns the Length of a String
substr(string, start)	Returns a Part of a String (Start Value of "0" to Begin at First Character)
strrev(string)	Reverses a String
str_shuffle(string)	Randomly Shuffles All Characters In a String
str_repeat(string, repeat)	Repeats a String a Specified Number of Times ("Repeat" Is Number of Times to Repeat)
strpbrk(string, characters)	Searches a String For Any of a Set of Characters
str_replace(find, replace, string)	Replaces Some Characters In a String (Case-Sensitive)
substr_replace(string, replacement, start)	Replaces a Part of a String With Another String
stristr(string, search)	Finds the First Occurrence of a String Inside Another String (Case-Insensitive)
strstr(string, search)	Finds the First Occurrence of a String Inside Another String (Case-Sensitive)
strrchr(string, char)	Finds the Last Occurrence of a String Inside Another String
stripos(string, find)	Returns the Position of the First Occurrence of a String Inside Another String (Case-Insensitive)
strpos(string, find)	Returns the Position of the First Occurrence of a String Inside Another String (Case-Sensitive)
strripos(string, find)	Returns the Position of the Last Occurrence of a String Inside Another String (Case-Insensitive)
strrpos(string, find)	Returns the Position of the Last Occurrence of a String Inside Another String (Case-Sensitive)
strcasecmp(string1, string2)	Compares Two Strings (Case-Insensitive)
strcmp(string1, string2)	Compares Two Strings (Case-Sensitive)
strtok(string, split)	Splits a String Into Smaller Strings
chunk_split(string, length)	Splits a String Into a Series of Smaller Parts (Default Length Is 76)
str_split(string, length)	Splits a String Into an Array
explode(separator, string)	Breaks a String Into an Array
implode(separator, array)	Returns a String From the Elements of an Array

ltrim(string)

O/P

rtrim(string)

O/P

trim(string)

O/P

lcfirst(string)

ucfirst(string)

strtolower(string)

strtoupper(string)

str_word_count(string)

count_chars(string,.mode)

substr_count(string,substring)

strlen(string)

substr(string,start)

srrrev(string)

str_shuffle(string)

str_repeat(string,repeat)

str_replace(find,replace,string)

stristr(string,search)

strrchar(string,char)

chunk_split(string,length)

O/P

strpos(string,find)

strripos(string,find)

strcmp(string1,string2)

strpbrk(string,character)

strncmp(string1,string2,length)

implode(separator,Array)

explode(separator,string)

str_split(string,split)

subtok(string,start)

O/P