addcslashes  Quote string with slashes in a C style
addslashes  Quote string with slashes
bin2hex  Convert binary data into hexadecimal representation 
chop  Alias of rtrim()
chr  Return a specific character
chunk_split  Split a string into smaller chunks
convert_cyr_string  Convert from one Cyrillic character set to another 
count_chars  Return information about characters used in a string 
crc32  Calculates the crc32 polynomial of a string
crypt  One-way string encryption (hashing)
echo  Output one or more strings
explode  Split a string by string
get_html_translation_table  Returns the translation table used by htmlspecialchars() and htmlentities() 
get_meta_tags  Extracts all meta tag content attributes from a file and returns an array 
hebrev  Convert logical Hebrew text to visual text 
hebrevc  Convert logical Hebrew text to visual text with newline conversion 
htmlentities  Convert all applicable characters to HTML entities 
htmlspecialchars  Convert special characters to HTML entities 
implode  Join array elements with a string
join  Join array elements with a string
levenshtein  Calculate Levenshtein distance between two strings 
localeconv  Get numeric formatting information
ltrim  Strip whitespace from the beginning of a string 
md5_file  Calculates the md5 hash of a given filename
md5  Calculate the md5 hash of a string
metaphone  Calculate the metaphone key of a string
nl_langinfo  Query language and locale information 
nl2br  Inserts HTML line breaks before all newlines in a string 
ord  Return ASCII value of character
parse_str  Parses the string into variables
print  Output a string
printf  Output a formatted string
quoted_printable_decode  Convert a quoted-printable string to an 8 bit string 
quotemeta  Quote meta characters
rtrim  Strip whitespace from the end of a string 
setlocale  Set locale information
similar_text  Calculate the similarity between two strings 
soundex  Calculate the soundex key of a string
sprintf  Return a formatted string
sscanf  Parses input from a string according to a format 
str_pad  Pad a string to a certain length with another string 
str_repeat  Repeat a string
str_replace  Replace all occurrences of the search string with the replacement string 
str_rot13  Perform the rot13 transform on a string
strcasecmp  Binary safe case-insensitive string comparison 
strchr  Find the first occurrence of a character 
strcmp  Binary safe string comparison
strcoll  Locale based string comparison
strcspn  Find length of initial segment not matching mask 
strip_tags  Strip HTML and PHP tags from a string
stripcslashes  Un-quote string quoted with addcslashes() 
stripslashes  Un-quote string quoted with addslashes() 
stristr  Case-insensitive strstr() 
strlen  Get string length
strnatcasecmp  Case insensitive string comparisons using a "natural order" algorithm 
strnatcmp  String comparisons using a "natural order" algorithm 
strncasecmp  Binary safe case-insensitive string comparison of the first n characters 
strncmp  Binary safe string comparison of the first n characters 
strpos  Find position of first occurrence of a string 
strrchr  Find the last occurrence of a character in a string 
strrev  Reverse a string
strrpos  Find position of last occurrence of a char in a string 
strspn  Find length of initial segment matching mask 
strstr  Find first occurrence of a string
strtok  Tokenize string
strtolower  Make a string lowercase
strtoupper  Make a string uppercase
strtr  Translate certain characters
substr_count  Count the number of substring occurrences
substr_replace  Replace text within a portion of a string
substr  Return part of a string
trim  Strip whitespace from the beginning and end of a string 
ucfirst  Make a string's first character uppercase
ucwords  Uppercase the first character of each word in a string 
vprintf  Output a formatted string
vsprintf  Return a formatted string
wordwrap  Wraps a string to a given number of characters using a string break character.
