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PHP string function reference

addcslashes()  Returns a string with backslashes in front of the specified characters
addslashes()  Returns a string with backslashes in front of predefined characters
bin2hex()  Converts a string of ASCII characters to hexadecimal values
chop()  Removes whitespace or other characters from the right end of a string
chr()  Returns a character from a specified ASCII value
chunk_split()  Splits a string into a series of smaller parts
convert_cyr_string()  Converts a string from one Cyrillic character-set to another
convert_uudecode()  Decodes a uuencoded string
convert_uuencode()  Encodes a string using the uuencode algorithm
count_chars()  Returns information about characters used in a string
crc32()  Calculates a 32-bit CRC for a string
crypt()  One-way string encryption (hashing)
echo()  Outputs one or more strings
explode()  Breaks a string into an array
fprintf()  Writes a formatted string to a specified output stream
get_html_translation_table()  Returns the translation table used by htmlspecialchars() and htmlentities()
hebrev()  Converts Hebrew text to visual text
hebrevc()  Converts Hebrew text to visual text and new lines (\n) into <br>
hex2bin()  Converts a string of hexadecimal values to ASCII characters
html_entity_decode()  Converts HTML entities to characters
htmlentities()  Converts characters to HTML entities
htmlspecialchars_decode()  Converts some predefined HTML entities to characters
htmlspecialchars()  Converts some predefined characters to HTML entities
implode()  Returns a string from the elements of an array
join()  Alias of implode()
lcfirst()  Converts the first character of a string to lowercase
levenshtein()  Returns the Levenshtein distance between two strings
localeconv()  Returns locale numeric and monetary formatting information
ltrim()  Removes whitespace or other characters from the left side of a string
md5()  Calculates the MD5 hash of a string
md5_file()  Calculates the MD5 hash of a file
metaphone()  Calculates the metaphone key of a string
money_format()  Returns a string formatted as a currency string
nl_langinfo()  Returns specific local information
nl2br()  Inserts HTML line breaks in front of each newline in a string
number_format()  Formats a number with grouped thousands
ord()  Returns the ASCII value of the first character of a string
parse_str()  Parses a query string into variables
print()  Outputs one or more strings
printf()  Outputs a formatted string
quoted_printable_decode()  Converts a quoted-printable string to an 8-bit string
quoted_printable_encode()  Converts an 8-bit string to a quoted printable string
quotemeta()  Quotes meta characters
rtrim()  Removes whitespace or other characters from the right side of a string
setlocale()  Sets locale information
sha1()  Calculates the SHA-1 hash of a string
sha1_file()  Calculates the SHA-1 hash of a file
similar_text()  Calculates the similarity between two strings
soundex()  Calculates the soundex key of a string
sprintf()  Writes a formatted string to a variable
sscanf()  Parses input from a string according to a format
str_getcsv()  Parses a CSV string into an array
str_ireplace()  Replaces some characters in a string (case-insensitive)
str_pad()  Pads a string to a new length
str_repeat()  Repeats a string a specified number of times
str_replace()  Replaces some characters in a string (case-sensitive)
str_rot13()  Performs the ROT13 encoding on a string
str_shuffle()  Randomly shuffles all characters in a string
str_split()  Splits a string into an array
str_word_count()  Count the number of words in a string
strcasecmp()  Compares two strings (case-insensitive)
strchr()  Finds the first occurrence of a string inside another string (alias of strstr())
strcmp()  Compares two strings (case-sensitive)
strcoll()  Compares two strings (locale based string comparison)
strcspn()  Returns the number of characters found in a string before any part of some specified characters are found
strip_tags()  Strips HTML and PHP tags from a string
stripcslashes()  Unquotes a string quoted with addcslashes()
stripslashes()  Unquotes a string quoted with addslashes()
stripos()  Returns the position of the first occurrence of a string inside another string (case-insensitive)
stristr()  Finds the first occurrence of a string inside another string (case-insensitive)
strlen()  Returns the length of a string
strnatcasecmp()  Compares two strings using a “natural order” algorithm (case-insensitive)
strnatcmp()  Compares two strings using a “natural order” algorithm (case-sensitive)
strncasecmp()  String comparison of the first n characters (case-insensitive)
strncmp()  String comparison of the first n characters (case-sensitive)
strpbrk()  Searches a string for any of a set of characters
strpos()  Returns the position of the first occurrence of a string inside another string (case-sensitive)
strrchr()  Finds the last occurrence of a string inside another string
strrev()  Reverses a string
strripos()  Finds the position of the last occurrence of a string inside another string (case-insensitive)
strrpos()  Finds the position of the last occurrence of a string inside another string (case-sensitive)
strspn()  Returns the number of characters found in a string that contains only characters from a specified charlist
strstr()  Finds the first occurrence of a string inside another string (case-sensitive)
strtok()  Splits a string into smaller strings
strtolower()  Converts a string to lowercase letters
strtoupper()  Converts a string to uppercase letters
strtr()  Translates certain characters in a string
substr()  Returns a part of a string
substr_compare()  Compares two strings from a specified start position (binary safe and optionally case-sensitive)
substr_count()  Counts the number of times a substring occurs in a string
substr_replace()  Replaces a part of a string with another string
trim()  Removes whitespace or other characters from both sides of a string
ucfirst()  Converts the first character of a string to uppercase
ucwords()  Converts the first character of each word in a string to uppercase
vfprintf()  Writes a formatted string to a specified output stream
vprintf()  Outputs a formatted string
vsprintf()  Writes a formatted string to a variable
wordwrap()  Wraps a string to a given number of characters
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