The PHP string functions are part of the PHP core. No installation is required to use these functions.
addcslashes — Quote string replace with slashes in a C style
addslashes — Quote string replace with slashes
bin2hex — Convert string binary data into hexadecimal representation
chop — Alias of rtrim remove blank space in last string
chr — Generate a single-byte string from a number
chunk_split — Split a string into smaller chunks
convert_cyr_string — Convert from one Cyrillic character set to another
convert_uudecode — Decode a uuencoded string
convert_uuencode — Uuencode a string
count_chars — Return information about characters used in a string
crc32 — Calculates the crc32 polynomial of a string
crypt — One-way string hashing
echo — Output one or more strings
explode — Split a string by a string
fprintf — Write a formatted string to a stream
get_html_translation_table — Returns the translation table used by htmlspecialchars and htmlentities
hebrev — Convert logical Hebrew text to visual text
hebrevc — Convert logical Hebrew text to visual text with newline conversion
hex2bin — Decodes a hexadecimally encoded binary string
html_entity_decode — Convert html entities to their corresponding characters
htmlentities — Convert all applicable characters to HTML entities
htmlspecialchars_decode — Convert special HTML entities back to characters
htmlspecialchars — Convert special characters to HTML entities
implode — Join array elements with a string
join — Alias of implode
lcfirst — Make a string's first character lowercase
levenshtein — Calculate Levenshtein distance between two strings
localeconv — Get numeric formatting information
ltrim — Strip whitespace (or other characters) from the beginning of a string
md5_file — Calculates the md5 hash of a given file
md5 — Calculate the md5 hash of a string
metaphone — Calculate the metaphone key of a string
money_format — Formats a number as a currency string
nl_langinfo — Query language and locale information
nl2br — Inserts HTML line breaks before all newlines in a string
number_format — Format a number with grouped thousands
ord — Convert the first byte of a string to a value between 0 and 255
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
quoted_printable_encode — Convert a 8 bit string to a quoted-printable string
quotemeta — Quote meta characters
rtrim — Strip whitespace (or other characters) from the end of a string
setlocale — Set locale information
sha1_file — Calculate the sha1 hash of a file
sha1 — Calculate the sha1 hash of a string
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_contains — Determine if a string contains a given substring
str_ends_with — Checks if a string ends with a given substring
str_getcsv — Parse a CSV string into an array
str_ireplace — Case-insensitive version of str_replace
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
str_shuffle — Randomly shuffles a string
str_split — Convert a string to an array
str_starts_with — Checks if a string starts with a given substring
str_word_count — Return information about words used in a string
strcasecmp — Binary safe case-insensitive string comparison
strchr — Alias of strstr
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
stripos — Find the position of the first occurrence of a case-insensitive substring in a string
stripslashes — Un-quotes a quoted string
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
strpbrk — Search a string for any of a set of characters
strpos — Find the position of the first occurrence of a substring in a string
strrchr — Find the last occurrence of a character in a string
strrev — Reverse a string
strripos — Find the position of the last occurrence of a case-insensitive substring in a string
strrpos — Find the position of the last occurrence of a substring in a string
strspn — Finds the length of the initial segment of a string consisting entirely of characters contained within a given mask
strstr — Find the first occurrence of a string
strtok — Tokenize string
strtolower — Make a string lowercase
strtoupper — Make a string uppercase
strtr — Translate characters or replace substrings
substr_compare — Binary safe comparison of two strings from an offset, up to length 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 (or other characters) 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
vfprintf — Write a formatted string to a stream
vprintf — Output a formatted string
vsprintf — Return a formatted string
wordwrap — Wraps a string to a given number of characters
