PHP String Functions

PHP provides various string functions to access and manipulate strings.

A list of PHP string functions are given below.

addcslashes()It is used to return a string with backslashes.addslashes()It is used to return a string with backslashes.bin2hex()It is used to converts a string of ASCII characters to hexadecimal values.chop()It removes whitespace or other characters from the right end of a stringchr()It is used to return a character from a specified ASCII value.chunk_split()It is used to split a string into a series of smaller parts.convert_cyr_string()It is used to convert a string from one Cyrillic character-set to another.convert_uudecode()It is used to decode a uuencoded string.convert_uuencode()It is used to encode a string using the uuencode algorithm.count_chars()It is used to return information about characters used in a string.crc32()It is used to calculate a 32-bit CRC for a string.crypt()It is used to create hashing string One-way.echo()It is used for output one or more strings.explode()It is used to break a string into an array.fprint()It is used to write a formatted string to a stream.get_html_translation_table()Returns translation table which is used by htmlspecialchars() and htmlentities().hebrev()It is used to convert Hebrew text to visual text.hebrevc()It is used to convert Hebrew text to visual text and new lines (\n) into <br>.hex2bin()It is used to convert string of hexadecimal values to ASCII characters.htmlentities()It is used to convert character to HTML entities.html_entity_decode()It is used to convert HTML entities to characters.htmlspecialchars()Converts the special characters to html entities.htmlspecialchars_decode()Converts the html entities back to special characters.Implode()It is used to return a string from the elements of an array.Join()It is the Alias of implode() function.Levenshtein()It is used to return the Levenshtein distance between two strings.Lcfirst()It is used to convert the first character of a string to lowercase.localeconv()Get numeric formatting informationltrim()It is used to remove whitespace from the left side of a string.md5()It is used to calculate the MD5 hash of a string.md5_files()It is used to calculate MD5 hash of a file.metaphone()It is used to calculate the metaphone key of a string.money_format()It is used to return a string formatted as a currency string.nl2br()It is used to insert HTML line breaks in front of each newline in a string.nl_langinfo()Query language and locale informationnumber_format()It is used to format a number with grouped thousands.ord()It is used to return ASCII value of the first character of a string.parse_str()It is used to parse a query string into variables.print()It is used for output one or more strings.printf()It is used to show output as a formatted string.quoted_printable_decode()Converts quoted-printable string to an 8-bit stringquoted_printable_encode()Converts the 8-bit string back to quoted-printable stringquotemeta()Quote meta charactersrtrim()It is used to remove whitespace from the right side of a string.setlocale()It is used to set locale information.sha1()It is used to return the SHA-1 hash of a string.sha1_file()It is used to return the SHA-1 hash of a file.similar_text()It is used to compare the similarity between two strings.Soundex()It is is used to calculate the soundex key of a string.sprintf()Return a formatted stringsscanf()It is used to parse input from a string according to a format.strcasecmp()It is used to compare two strings.strchr()It is used to find the first occurrence of a string inside another string.strcmp()Binary safe string comparison (case-sensitive)strcoll()Locale based binary comparison(case-sensitive)strcspn()It is used to reverses a string.stripcslashes()It is used to unquote a string quoted with addcslashes().stripos()It is used to return the position of the first occurrence of a string inside another string.stristr()Case-insensitive strstrstrlen()It is used to return the length of a string.strncasecmp()Binary safe case-insensitive string comparisonstrnatcasecmp()It is used for case-insensitive comparison of two strings using a "natural order" algorithmstrnatcmp()It is used for case-sensitive comparison of two strings using a "natural order" algorithmstrncmp()It is used to compare of the first n characters.strpbrk()It is used to search a string for any of a set of characters.strripos()It finds the position of the last occurrence of a case-insensitive substring in a string.strrpos()It finds the length of the last occurrence of a substring in a string.strpos()It is used to return the position of the first occurrence of a string inside another string.strrchr()It is used to find the last occurrence of a string inside another string.strrev()It is used to reverse a string.strspn()Find the initial length of the initial segment of the stringstrstr()Find the occurrence of a string.strtok()Splits the string into smaller stringsstrtolower()Convert the string in lowercasestrtoupper()Convert the strings in uppercasestrtr()Translate certain characters in a string or replace the substringstr_getcsv()It is used to parse a CSV string into an array.str_ireplace()It is used to replace some characters in a string (case-insensitive).str_pad()It is used to pad a string to a new length.str_repeat()It is used to repeat a string a specified number of times.str_replace()It replaces all occurrences of the search string with the replacement string.str_rot13()It is used to perform the ROT13 encoding on a string.str_shuffle()It is used to randomly shuffle all characters in a string.str_split()It is used to split a string into an array.strcoll()It is locale based string comparison.strip_tags()It is used to strip HTML and PHP tags from a string.str_word_count()It is used to count the number of words in a string.substr()Return the part of a stringsubstr_compare()Compares two strings from an offset up to the length of characters. (Binary safe comparison)substr_count()Count the number of times occurrence of a substringsubstr_replace()Replace some part of a string with another substringtrim()Remove whitespace or other characters from the beginning and end of the string.ucfirst()Make the first character of the string to uppercaseucwords()Make the first character of each word in a string to uppercasevfprintf()Write a formatted string to a streamvprintf()Display the output as a formatted string according to formatvsprintf()It returns a formatted stringwordwrap()Wraps a string to a given number of characters

PHP String Function Examples

1) PHP strtolower() function

The strtolower() function returns string in lowercase letter.

Syntax

HTML Tutorial

1. string strtolower ( string $string )  

Example

1. <?php  
2. $str="My name is KHAN";  
3. $str=strtolower($str);  
4. echo $str;  
5. ?>  

Output:

my name is khan

2) PHP strtoupper() function

The strtoupper() function returns string in uppercase letter.

Syntax

1. string strtoupper ( string $string )  

Example

1. <?php  
2. $str="My name is KHAN";  
3. $str=strtoupper($str);  
4. echo $str;  
5. ?>  

Output:

MY NAME IS KHAN

3) PHP ucfirst() function

The ucfirst() function returns string converting first character into uppercase. It doesn't change the case of other characters.

Syntax

1. string ucfirst ( string $str )  

Example

1. <?php  
2. $str="my name is KHAN";  
3. $str=ucfirst($str);  
4. echo $str;  
5. ?>  

Output:

My name is KHAN

4) PHP lcfirst() function

The lcfirst() function returns string converting first character into lowercase. It doesn't change the case of other characters.

Syntax

1. string lcfirst ( string $str )  

Example

1. <?php  
2. $str="MY name IS KHAN";  
3. $str=lcfirst($str);  
4. echo $str;  
5. ?>  

Output:

mY name IS KHAN

5) PHP ucwords() function

The ucwords() function returns string converting first character of each word into uppercase.

Syntax

1. string ucwords ( string $str )  

Example

1. <?php  
2. $str="my name is Sonoo jaiswal";  
3. $str=ucwords($str);  
4. echo $str;  
5. ?>  

Output:

My Name Is Sonoo Jaiswal

6) PHP strrev() function

The strrev() function returns reversed string.

Syntax

1. string strrev ( string $string )  

Example

1. <?php  
2. $str="my name is Sonoo jaiswal";  
3. $str=strrev($str);  
4. echo $str;  
5. ?>  

Output:

lawsiaj oonoS si eman ym

7) PHP strlen() function

The strlen() function returns length of the string.

Syntax

1. int strlen ( string $string )  

Example

1. <?php  
2. $str="my name is Sonoo jaiswal";  
3. $str=strlen($str);  
4. echo $str;  
5. ?>  

Output:

24