PHP String Functions Complete Reference

Strings are a collection of characters. For example, ‘G’ is the character and ‘GeeksforGeeks’ is the string. 

Installation: These functions are not required any installation. These are the part of PHP core. The complete list of PHP string functions are given below:

Example: This program helps us to calculate a 32-bit CRC for the string “Hello World”, both with %u and without %u.

PHP

<?php
// PHP program illustrate the
// crc32() function

$str1 = crc32("Hello world.");

// print without %u
echo 'Without %u: '.$str1."\n";

// print with %u
echo 'With %u: ';

printf("%u\n", $str1);
?>

Output:

Without %u: 2335835140
With %u: 2335835140

The complete list of String Functions are given below:

PHP String Functions	Description	Example
addcslashes()	Add backslashes before some specified characters in a given string.	Try
addslashes()	Returns a string with backslashes in front of predefined characters.	Try
bin2hex()	The conversion is done byte-wise with the high-nibble first.	Try
chop()	Remove white spaces or any other specified characters from the end of a string.	Try
chr()	Convert a ASCII value to a character.	Try
chunk_split()	Split a string into smaller chunks of a specific length.	Try
convert_uudecode()	Decode a uuencoded string encoded using convert_uuencode() function.	Try
convert_uuencode()	Encodes a string using the uuencode algorithm.	Try
count_chars()	Perform several operations related to string like the number of an ASCII character occurs in a string.	Try
crc32()	This function can be used to validate data integrity.	Try
PHP crypt()	Returns a hashed string using DES, Blowfish, or MD5 algorithms.	Try
password_hash()	Returns the hashed string on success or FALSE	Try
echo	Display the output of parameters that are passed to it.	Try
explode()	Explode() function splits a string based on a string delimiter	Try
hex2bin()	Decode a hexadecimally encoded binary string.	Try
implode()	Elements of an array. implode() is an alias for PHP	Try
join()	Join an array of elements that are separated by a string.	Try
lcfirst()	It takes a string as an argument	Try
levenshtein()	Calculate the levenshtein distance between two strings	Try
ltrim()	Removes whitespaces or other characters	Try
md5_file()	Generate the md5 hash value of a given file.	Try
md5()	This function can take up to a maximum of two parameters	Try
metaphone()	Calculate the metaphone key of a given string.	Try
nl2br()	Insert HTML break tags in the place of all new lines in a string.	Try
number_format()	Format a number with grouped thousands.	Try
ord()	Returns the ASCII value of the first character of a string	Try
parse_str()	parse_str() function is a built-in function in PHP which parses a query string into variables.	Try
quoted_printable_decode()	Decode a quoted printable string in PHP into an 8-bit string.	Try
quoted_printable_encode()	Convert an 8-bit string to a quoted printable string.	Try
quotemeta()	Accepts a string as an argument and returns a string	Try
rtrim()	Removes whitespaces or other characters (if specified) from the right side of a string.	Try
sha1_file()	Returns a string on success and returns FALSE otherwise.	Try
sha1()	This function an take up to a maximum of two parameters	Try
similar_text()	Returns the number of matching characters in the two strings.	Try
soundex()	Calculate the Soundex key of a given string.	Try
str_pad()	Pad a string to a given length.	Try
str_repeat()	Create a new string by repeating a given string fixed number of times.	Try
str_replace()	Replace all the occurrences of the search string or array of search strings	Try
str_rot13()	Accepts a string and shifts every alphabet present in the string by 13 places in the alphabet	Try
str_shuffle()	Randomly shuffle all the characters of a string passed to the function as a parameter.	Try
str_split()	Convert the given string into an array.	Try
str_word_count()	String like total number word in the string, positions of the words in the string etc.	Try
strcasecmp()	This is used to compare two given strings.	Try
strchr()	Search for the first occurrence of a given string	Try
strcmp()	It is used to compare two strings	Try
strcoll()	It is used to compare two strings.	Try
strcspn()	Returns the number of characters present in a string	Try
strip_tags()	This is used to strips a string from HTML, and PHP tags.	Try
stripos()	Find the position of the first occurrence of a string in another string.	Try
stripslashes()	Removes backslashes in a string.	Try
stristr()	It searches for the first occurrence of a string inside another string and displays the portion	Try
strlen()	It takes a string as a parameter and returns its length.	Try
strnatcasecmp()	This function is similar to strnatcmp()only difference being the (case-insensitivity).	Try
strnatcmp()	Return a positive integer, negative, or zero.	Try
strncasecmp()	Compare two given strings. It is case-insensitive.	Try
strncmp()	Compare the first n character of two strings.	Try
strpbrk()	Searches a string for any of the specified characters.	Try
strpos()	Find the position of the first occurrence of a string in another string.	Try
strrchr()	This function takes two arguments a string and a character.	Try
strrev()	It is used to reverse a string.	Try
strripos()	Out of the three parameters specified in the syntax, two are mandatory and one is optional	Try
strrpos()	Out of the three parameters specified in the syntax, two are mandatory and one is optional.	Try
strspn()	Finds the length of the initial segment of a string	Try
strstr()	It searches for the first occurrence of a string inside another string and displays the portion	Try
strtok()	Tokenize a string into smaller parts on the basis of given delimiters	Try
strtolower()	Convert a string into lowercase.	Try
strtoupper()	Convert a string into uppercase	Try
strtr()	Replace a substring in a string to a given string of characters.	Try
substr_compare()	Compare two strings from a specified start position upto a specified length.	Try
substr_count()	Count the number of times a substring occurs in a given string.	Try
substr_replace()	Replace a part of a string with another string.	Try
substr()	That is used to extract a part of a string.	Try
trim()	Removes whitespaces and also the predefined characters from both sides.	Try
ucfirst()	Takes a string as an argument and returns the string	Try
ucwords()	Convert the first character of every word in a string to upper-case.	Try
vprintf()	Display array values as a formatted string	Try
vsprintf()	Display array values as a formatted string.	Try
wordwrap()	Wraps a given string to a given number of characters using a string break character.	Try