string functions in PHP

Function	Description
addcslashes	adds backslashes in front of the specified characters and returns the string
addslashes	adds backslashes in front of predefined characters and returns string
bin2hex	a string of ASCII characters is converted to hexadecimal values
chop	alias to rtrim()
chr	converts a specified ASCII value to character and returns it
chunk-split	specified string is divided into a series of smaller parts
convert-cyr-string	one Cyrillic character-set from specified string is converted to another
convert-uudecode	a uuencoded string is decoded
convert-uuencode	using the uuencode algorithm, a specified string is encoded
count-chars	returns the count of an ASCII character occurrence within a specified string and returns the information
crc32	a 32-bit CRC is calculated for a specified string
crypt	string is encrypted in one-way (hashing)
echo	prints string
explode	returns an array formed from a specified string
fprintf	allows to write a formatted string to a specified output stream
get-html-translation-table	returns the translation table used by htmlspecialchars() and htmlentities()
hebrev	Hebrew text is converted to visual text
hebrevc	Hebrew text is converted to visual text and also new lines (\n) are converted to <br />
html-entity-decode	HTML entities are converted to characters
htmlentities	characters are converted to HTML entities
htmlspecialchars-decode	some predefined HTML entities are converted to characters
htmlspecialchars	some predefined characters are converted to HTML entities
implode	returns a string formed from the elements of an array
join	alias to implode()
levenshtein	calculates the Levenshtein distance between two strings and returns
ltrim	whitespace from the left side of a specified string is striped
md5	returns the calculated MD5 hash of a specified string
md5-file	returns the calculated MD5 hash of a specified file
metaphone	returns a calculated metaphone key of a specified string
nl2br	adds HTML line breaks (\n) in front of each newline in a specified string
number-format	returns a formatted number with grouped thousands
ord	calculates the ASCII value of the first character of a specified string and returns
parse-str	a query string is parsed into variables and returned
print	prints a string
printf	prints a formatted string
quoted-printable-decode	returns a decoded string from quoted-printable string
quotemeta	quotes meta characters from specified string and returns
rtrim	whitespace from the right side of a specified string is striped
setlocale	locale information is set
sha1	returns a calculated SHA-1 hash of a specified string
sha1-file	returns a calculated SHA-1 hash of a specified file
similar-text	returns the calculated similarity between two specified strings
soundex	returns a calculated soundex key of a specified string
sprintf	writes a formatted string to a variable
sscanf	Parses input from a string according to a format
str-ireplace	returns a string by replacing some characters in a specified string (case-insensitive)
str-pad	returns a string by padding a specified string to a new length
str-repeat	returns a string by repeating a specified string for a specified number of times
str-replace	returns a string by replacing some characters in a specified string (case-sensitive)
str-rot13	returns a calculated ROT13 encoded of a specified string
str-shuffle	returns a string by Randomly shuffling all characters in a specified string
str-split	returns an array by splitting a specified string into an array
str-word-count	calculates the number of words in a specified string and returns
strcasecmp	returns the comparison of two specified strings (case-insensitive)
strchr	finds the first occurrence of a string inside another string (alias of strstr()) and returns the rest of the string
strcmp	returns the comparison of two specified strings (case-sensitive)
strcoll	returns the result of locale based string comparison
strcspn	Returns the number of characters found in a string before any part of some specified characters are found
strip-tags	returns a string by removing HTML and PHP tags from a specified string
stripcslashes	returns a string by removing backslashes added by the addcslashes() function
stripslashes	returns a string by removing backslashes added by the addslashes() function
stripos	calculates the position of first occurrence of a string inside another string and returns it (case-insensitive)
stristr	calculates the first occurrence of a string inside another string (case-insensitive)
strlen	calculates the length of a string and returns
strnatcasecmp	returns the comparison of two strings using a "natural order" algorithm (case-insensitive)
strnatcmp	returns the comparison of two strings using a "natural order" algorithm (case-sensitive)
strncasecmp	returns the result of string comparison of the first n characters (case-insensitive)
strncmp	returns the result of string comparison of the first n characters (case-sensitive)
strpbrk	searches a string for any of a set of characters and returns the rest of string
strpos	calculates the position of first occurrence of a string inside another string and returns it(case-sensitive)
strrchr	calculates the last occurrence of a string inside another string
strrev	returns a string after reversing
strripos	calculates the position of the last occurrence of a string inside another string and returns it(case-insensitive)
strrpos	calculates the position of the last occurrence of a string inside another string and returns it(case-sensitive)
strspn	returns the number of characters found in a string that contains only characters from a specified charlist
strstr	calculates the first occurrence of a string inside another string and returns it(case-sensitive)
strtok	divides a string into smaller strings and returns it
strtolower	returns a string after converting to lowercase letters
strtoupper	returns a string after converting to uppercase letters
strtr	returns a string after translating certain characters in a specified string
substr	returns a specified part of a string
substr-compare	returns a result of comparison of two strings from a specified start position (binary safe and optionally case-sensitive)
substr-count	returns the count of number of times a substring occurs in a string
substr-replace	returns a modified string after replacing a part of a specified string with another specified string
trim	returns a string after removing whitespace from both sides of a specified string
ucfirst	returns a string after changing a first character of a specified string to uppercase
ucwords	returns a string after changing the first character of each word in a specified string to uppercase
vfprintf	writes a formatted string to a specified stream
vprintf	prints a formatted string
vsprintf	returns a formatted string
wordwrap	wraps a string to a given number of characters