PHP String Functions

#	Function	Example	Description
1	addcslashes	addcslashes (string,charlist )	Returns a string with backslashes before characters that are listed in charlist parameter.
2	addslashes	addslashes (string)	add a backslash to any single quotes, double quotes, backslash, and NULL.
3	bin2hex	bin2hex ( string)	convert binary data into hexadecimal.
4	chop	string chop(string)	remove white space on the right end of a string
5	chr	string chr ( int $ascii )	returns a character from ASCII value.
6	chunk_split	chunk_split(string,length,end)	splits a string into parts
7	convert_cyr_string	string convert_cyr_string ( string $str , string $from , string $to )	Convert from one Cyrillic character set to another
8	convert_uudecode	string convert_uudecode ( string $data )	Decode a uuencoded string
9	convert_uuencode	string convert_uuencode ( string $data )	Uuencode a string using Uuencode algorithm
10	count_chars	mixed count_chars ( string $string [, int $mode = 0 ] )	Return information about characters used in a string
11	crc32	int crc32 ( string $str )	Calculates the crc32 polynomial of a string
12	crypt	string crypt ( string $str [, string $salt ] )	One-way string hashing
13	echo	void echo ( string $arg1 [, string $... ] )	Output one or more strings
14	explode	array explode ( string $delimiter , string $string [, int $limit ] )	Split a string by string
15	fprintf	int fprintf ( resource $handle , string $format [, mixed $args [, mixed $... ]] )	Write a formatted string to a stream
16	get_html_translation_table	ENT_HTML5)	Returns the translation table used by htmlspecialchars() and htmlentities()
17	hebrev	string hebrev ( string $hebrew_text [, int $max_chars_per_line = 0 ] )	Convert logical Hebrew text to visual text
18	hebrevc	string hebrevc ( string $hebrew_text [, int $max_chars_per_line = 0 ] )	Convert logical Hebrew text to visual text with newline conversion
19	hex2bin	string hex2bin ( string $data )	Decodes a hexadecimally encoded binary string
20	html_entity_decode	$b = html_entity_decode($a)	Convert all HTML entities to their applicable characters
21	htmlentities	echo htmlentities($str)	Convert all applicable characters to HTML entities
22	htmlspecialchars_decode	echo htmlspecialchars_decode($str)	Convert special HTML entities back to characters
23	htmlspecialchars	$new = htmlspecialchars("Test", ENT_QUOTES)	Convert special characters to HTML entities
24	implode	string implode ( string $glue , array $pieces )	Join array elements with a string
25	join	$comma_separated = join(",", $array)	Alias of implode()
26	lcfirst	string lcfirst ( string $str )	Make a string's first character lowercase
27	levenshtein	int levenshtein ( string $str1 , string $str2 )	Calculate Levenshtein distance between two strings
28	localeconv	array localeconv ( void )	Returns an associative array containing localized numeric and monetary formatting information
29	ltrim	string ltrim ( string $str [, string $charlist ] )	Strip whitespace (or other characters) from the beginning of a string
30	md5_file	string md5_file ( string $filename [, bool $raw_output = false ] )	Calculates the md5 hash of a given file
31	md5	string md5 ( string $str [, bool $raw_output = false ] )	Calculate the md5 hash of a string
32	metaphone	string metaphone ( string $str [, int $phonemes = 0 ] )	Calculate the metaphone key of a string
33	money_format	string money_format ( string $format , float $number )	Formats a number as a currency string
34	nl_langinfo	string nl_langinfo ( int $item )	Query language and locale information
35	nl2br	string nl2br ( string $string [, bool $is_xhtml = true ] )	Inserts HTML line breaks before all newlines in a string
36	number_format	string number_format ( float $number [, int $decimals = 0 ] )	Format a number with grouped thousands
37	ord	int ord ( string $string )	Returns the ASCII value of the first character of string
38	parse_str	void parse_str ( string $str [, array &$arr ] )	Parses the string into variables
39	print	print("Hello World")	Output a string
40	printf	printf("%d", "17,999")	Output a formatted string
41	quoted_printable_decode	string quoted_printable_decode ( string $str )	Convert a quoted-printable string to an 8 bit string
42	quoted_printable_encode	string quoted_printable_encode ( string $str )	Convert a 8 bit string to a quoted-printable string
43	quotemeta	string quotemeta ( string $str )	Quote meta characters
44	rtrim	string rtrim ( string $str [, string $charlist ] )	Strip whitespace (or other characters) from the end of a string
45	setlocale	string setlocale ( int $category , array $locale )	Set locale information
46	sha1_file	string sha1_file ( string $filename [, bool $raw_output = false ] )	Calculate the sha1 hash of a file
47	sha1	string sha1 ( string $str [, bool $raw_output = false ] )	Calculate the sha1 hash of a string
48	similar_text	int similar_text ( string $first , string $second [, float &$percent ] )	Calculate the similarity between two strings
49	soundex	string soundex ( string $str )	Calculate the soundex key of a string
50	sprintf	string sprintf ( string $format [, mixed $args [, mixed $... ]] )	Returns a string produced according to the formatting string format
51	sscanf	mixed sscanf ( string $str , string $format [, mixed &$... ] )	Parses input from a string according to a format
52	str_getcsv	$Data = str_getcsv($CsvString, "\n")	Parse a CSV string into an array
53	str_ireplace	mixed str_ireplace ( mixed $search , mixed $replace , mixed $subject [, int &$count ] )	Case-insensitive version of str_replace()
54	str_pad	echo str_pad($input, 10)	Pad a string to a certain length with another string
55	str_repeat	string str_repeat ( string $input , int $multiplier )	Returns input repeated multiplier times
56	str_replace	$bodytag = str_replace("%body%", "black", "")	Replace all occurrences of the search string with the replacement string
57	str_rot13	string str_rot13 ( string $str )	Perform the rot13 transform on a string
58	str_shuffle	string str_shuffle ( string $str )	Randomly shuffles a string
59	str_split	array str_split ( string $string [, int $split_length = 1 ] )	Convert a string to an array
60	str_word_count	mixed str_word_count ( string $string [, int $format = 0 [, string $charlist ]] )	Return information about words used in a string
61	strcasecmp	int strcasecmp ( string $str1 , string $str2 )	Binary safe case-insensitive string comparison
62	strchr	$result_string = substr("$string1",0,$position_num)	Alias of strstr()
63	strcmp	int strcmp ( string $str1 , string $str2 )	Binary safe string comparison
64	strcoll	int strcoll ( string $str1 , string $str2 )	Locale based string comparison
65	strcspn	$c = strcspn('hello', 'l')	Find length of initial segment not matching mask
66	strip_tags	string strip_tags ( string $str [, string $allowable_tags ] )	Strip HTML and PHP tags from a string
67	stripcslashes	string stripcslashes ( string $str )	Returns a string with backslashes stripped off
68	stripos	$pos1 = stripos("apple", "pl")	Find the position of the first occurrence of a case-insensitive substring in a string
69	stripslashes	string stripslashes ( string $str )	Un-quotes a quoted string
70	stristr	echo stristr('[email protected], 'e')	Case-insensitive php strstr
71	strlen	int strlen ( string $string )	Get string length
72	strnatcasecmp	int strnatcasecmp ( string $str1 , string $str2 )	Case insensitive string comparisons using a "natural order" algorithm
73	strnatcmp	int strnatcmp ( string $str1 , string $str2 )	String comparisons using a "natural order" algorithm
74	strncasecmp	int strncasecmp ( string $str1 , string $str2 , int $len )	Binary safe case-insensitive string comparison of the first n characters
75	strncmp	int strncmp ( string $str1 , string $str2 , int $len )	Binary safe string comparison of the first n characters
76	strpbrk	string strpbrk ( string $haystack , string $char_list )	Search a string for any of a set of characters
77	strpos	int strpos ( string $haystack , mixed $needle [, int $offset = 0 ] )	Find the position of the first occurrence of a substring in a string
78	strrchr	string strrchr ( string $haystack , mixed $needle )	Find the last occurrence of a character in a string
79	strrev	string strrev ( string $string )	Reverse a string
80	strripos	int strripos ( string $haystack , string $needle [, int $offset = 0 ] )	Find the position of the last occurrence of a case-insensitive substring in a string
81	strrpos	int strrpos ( string $haystack , string $needle [, int $offset = 0 ] )	Find the position of the last occurrence of a substring in a string
82	strspn	var_dump(strspn("foo", "o"))	Finds the length of the initial segment of a string consisting entirely of characters contained within a given mask
83	strstr	$domain = strstr('[email protected]', '@');	Find the first occurrence of a string
84	strtok	string strtok ( string $token )	Tokenize string
85	strtolower	string strtolower ( string $str )	Make a string lowercase
86	strtoupper	string strtoupper ( string $string )	Make a string uppercase
87	strtr	string strtr ( string $str , string $from , string $to ) or string strtr ( string $str , array $replace_pairs )	Translate characters or replace substrings
88	substr_compare	echo substr_compare("abcde", "bc", 1, 2)	Binary safe comparison of two strings from an offset, up to length characters
89	substr_count	int substr_count ( string $haystack , string $needle [, int $offset = 0 [, int $length ]] )	Count the number of substring occurrences
90	substr_replace	mixed substr_replace ( mixed $string , mixed $replacement , mixed $start [, mixed $length ])	Replace text within a portion of a string
91	substr	string substr ( string $string , int $start [, int $length ] )	Return part of a string
92	trim	string trim ( string $str , $charlist)	Strip whitespace (or other characters) from the beginning and end of a string
93	ucfirst	string ucfirst ( string $str )	Make a string's first character uppercase
94	ucwords	string ucwords ( string $str )	Uppercase the first character of each word in a string
95	vfprintf	int vfprintf ( resource $handle , string $format , array $args )	Write a formatted string to a stream
96	vprintf	int vprintf (format , array $args )	Output a formatted string
97	vsprintf	string vsprintf (format , array $args )	writes a formatted string to a variable.
98	wordwrap	wordwrap(string,width,break,cut);	Wraps a string to a given number of characters