PHP String Functions

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PHP String FunctionsPHP String Introduction

The string functions allow you to manipulate strings.


Installation

The string functions are part of the PHP core. There is no installation needed to use these functions.


PHP String Functions

PHP: indicates the earliest version of PHP that supports the function.

FunctionDescriptionPHP
addcslashes()Returns a string with backslashes in front of the specified characters4
addslashes()Returns a string with backslashes in front of predefined characters3
bin2hex()Converts a string of ASCII characters to hexadecimal values3
chop()Alias of rtrim()3
chr()Returns a character from a specified ASCII value3
chunk_split()Splits a string into a series of smaller parts3
convert_cyr_string()Converts a string from one Cyrillic character-set to another3
convert_uudecode()Decodes a uuencoded string5
convert_uuencode()Encodes a string using the uuencode algorithm5
count_chars()Returns how many times an ASCII character occurs within a string and returns the information4
crc32()Calculates a 32-bit CRC for a string4
crypt()One-way string encryption (hashing)3
echo()Outputs strings3
explode()Breaks a string into an array3
fprintf()Writes a formatted string to a specified output stream5
get_html_translation_table()Returns the translation table used by htmlspecialchars() and htmlentities()4
hebrev()Converts Hebrew text to visual text3
hebrevc()Converts Hebrew text to visual text and new lines (\n) into <br />3
html_entity_decode()Converts HTML entities to characters4
htmlentities()Converts characters to HTML entities3
htmlspecialchars_decode()Converts some predefined HTML entities to characters5
htmlspecialchars()Converts some predefined characters to HTML entities3
implode()Returns a string from the elements of an array3
join()Alias of implode()3
levenshtein()Returns the Levenshtein distance between two strings3
localeconv()Returns locale numeric and monetary formatting information4
ltrim()Strips whitespace from the left side of a string3
md5()Calculates the MD5 hash of a string3
md5_file()Calculates the MD5 hash of a file4
metaphone()Calculates the metaphone key of a string4
money_format()Returns a string formatted as a currency string4
nl_langinfo()Returns specific local information4
nl2br()Inserts HTML line breaks in front of each newline in a string3
number_format()Formats a number with grouped thousands3
ord()Returns the ASCII value of the first character of a string3
parse_str()Parses a query string into variables3
print()Outputs a string3
printf()Outputs a formatted string3
quoted_printable_decode()Decodes a quoted-printable string3
quotemeta()Quotes meta characters3
rtrim()Strips whitespace from the right side of a string3
setlocale()Sets locale information3
sha1()Calculates the SHA-1 hash of a string4
sha1_file()Calculates the SHA-1 hash of a file4
similar_text()Calculates the similarity between two strings3
soundex()Calculates the soundex key of a string3
sprintf()Writes a formatted string to a variable3
sscanf()Parses input from a string according to a format4
str_ireplace()Replaces some characters in a string (case-insensitive)5
str_pad()Pads a string to a new length4
str_repeat()Repeats a string a specified number of times4
str_replace()Replaces some characters in a string (case-sensitive)3
str_rot13()Performs the ROT13 encoding on a string4
str_shuffle()Randomly shuffles all characters in a string4
str_split()Splits a string into an array5
str_word_count()Count the number of words in a string4
strcasecmp()Compares two strings (case-insensitive)3
strchr()Finds the first occurrence of a string inside another string (alias of strstr())3
strcmp()Compares two strings (case-sensitive)3
strcoll()Locale based string comparison4
strcspn()Returns the number of characters found in a string before any part of some specified characters are found3
strip_tags()Strips HTML and PHP tags from a string3
stripcslashes()Unquotes a string quoted with addcslashes()4
stripslashes()Unquotes a string quoted with addslashes()3
stripos()Returns the position of the first occurrence of a string inside another string (case-insensitive)5
stristr()Finds the first occurrence of a string inside another string (case-insensitive)3
strlen()Returns the length of a string3
strnatcasecmp()Compares two strings using a “natural order” algorithm (case-insensitive)4
strnatcmp()Compares two strings using a “natural order” algorithm (case-sensitive)4
strncasecmp()String comparison of the first n characters (case-insensitive)4
strncmp()String comparison of the first n characters (case-sensitive)4
strpbrk()Searches a string for any of a set of characters5
strpos()Returns the position of the first occurrence of a string inside another string (case-sensitive)3
strrchr()Finds the last occurrence of a string inside another string3
strrev()Reverses a string3
strripos()Finds the position of the last occurrence of a string inside another string (case-insensitive)5
strrpos()Finds the position of the last occurrence of a string inside another string (case-sensitive)3
strspn()Returns the number of characters found in a string that contains only characters from a specified charlist3
strstr()Finds the first occurrence of a string inside another string (case-sensitive)3
strtok()Splits a string into smaller strings3
strtolower()Converts a string to lowercase letters3
strtoupper()Converts a string to uppercase letters3
strtr()Translates certain characters in a string3
substr()Returns a part of a string3
substr_compare()Compares two strings from a specified start position (binary safe and optionally case-sensitive)5
substr_count()Counts the number of times a substring occurs in a string4
substr_replace()Replaces a part of a string with another string4
trim()Strips whitespace from both sides of a string3
ucfirst()Converts the first character of a string to uppercase3
ucwords()Converts the first character of each word in a string to uppercase3
vfprintf()Writes a formatted string to a specified output stream5
vprintf()Outputs a formatted string4
vsprintf()Writes a formatted string to a variable4
wordwrap()Wraps a string to a given number of characters4

 


PHP String Constants

PHP: indicates the earliest version of PHP that supports the constant.

ConstantDescriptionPHP
CRYPT_SALT_LENGTHContains the length of the default encryption method for the
system. For standard DES encryption, the length is 2
CRYPT_STD_DESSet to 1 if the standard DES-based encryption with a 2 character salt is supported, 0 otherwise
CRYPT_EXT_DESSet to 1 if the extended DES-based encryption with a 9 character salt is supported, 0 otherwise
CRYPT_MD5Set to 1 if the MD5 encryption with a 12 character salt starting with $1$ is supported, 0 otherwise
CRYPT_BLOWFISHSet to 1 if the Blowfish encryption with a 16 character salt starting with $2$ or $2a$ is supported, 0 otherwise0
HTML_SPECIALCHARS
HTML_ENTITIES
ENT_COMPAT
ENT_QUOTES
ENT_NOQUOTES
CHAR_MAX
LC_CTYPE
LC_NUMERIC
LC_TIME
LC_COLLATE
LC_MONETARY
LC_ALL
LC_MESSAGES
STR_PAD_LEFT
STR_PAD_RIGHT
STR_PAD_BOTH
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