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PHP String Functions

PHP provides various string functions to access and manipulate strings. A list of important PHP string functions are given below.

PHP STRING FUNTIONS

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 string
chr() 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.
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.
print() It is used for output one or more strings.
fprint() It is used to write a formatted string to a stream.
nl2br() It is used to insert HTML line breaks in front of each newline in a string.
number_format() It is used to format a number with grouped thousands.
htmlentities() It is used to convert character to HTML entities.
html_entity_decode() It is used to convert HTML entities to characters.
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.
Implode() It is used to return a string from the elements of an array.
Lcfirst() It is used to convert the first character of a string to lowercase.
Join() It is the Alias of implode() function.
Levenshtein() It is used to return the Levenshtein distance between two strings.
trim() It is used to remove whitespace.
ltrim() It is used to remove whitespace from the left side of a string.
rtrim() It is used to remove whitespace from the right 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.
Soundex() It is is used to calculate the soundex key of a string.
setlocale() It is used to set locale information.
money_format() It is used to return a string formatted as a currency string.
printf() It is used to show output as a formatted string.
sha1() It is used to return the SHA-1 hash of a string.
sscanf() It is used to parse input from a string according to a format.
str_getcsv() It is used to parse a CSV string into an array.
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.
str_pad() It is used to pad a string to a new length.
str_ireplace() It is used to replace some characters in a string (case-insensitive).
str_repeat() It is used to repeat a string a specified number of times.
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.
str_word_count() It is used to count the number of words in a string.
strcasecmp() It is used to compare two strings.
strchr() It is used to find the first occurrence of a string inside another string.
stscroll() It is locale based string comparison.
strcmp() It is binary safe string comparison.
strcspn() It is used to reverses a string.
strip_tags() It is used to strip HTML and PHP tags from 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.
strlen() It is used to return the length of a string.
strnatcasecmp() It is used to compare two strings using a "natural order" algorithm.
strnatcmp() It is used to compare two strings using a "natural order" algorithm.
strncmp() 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.
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.

1) PHP strtolower() function

The strtolower() function returns string in lowercase letter.

Syntax

Example

Output:

my name is khan

2) PHP strtoupper() function

The strtoupper() function returns string in uppercase letter.

Syntax

Example

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

Example

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

Example

Output:

mY name IS KHAN

5) PHP ucwords() function

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

Syntax

Example

Output:

My Name Is Sonoo Jaiswal

6) PHP strrev() function

The strrev() function returns reversed string.

Syntax

Example

Output:

lawsiaj oonoS si eman ym

7) PHP strlen() function

The strlen() function returns length of the string.

Syntax

Example

Output:

24
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