Javascript debugger
Website design
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These functions all manipulate strings in various ways. Some more
specialized sections can be found in the regular expression and
URL handling sections.
For information on how strings behave, especially with regard to
usage of single quotes, double quotes, and escape sequences, see
the Strings entry in
the Types section of the
manual.
No external libraries are needed to build this extension.
There is no installation needed to use these
functions; they are part of the PHP core.
The constants below are defined by this extension, and
will only be available when the extension has either
been compiled into PHP or dynamically loaded at runtime.
CRYPT_SALT_LENGTH
integer
CRYPT_STD_DES
integer
CRYPT_EXT_DES
integer
CRYPT_MD5
integer
CRYPT_BLOWFISH
integer
HTML_SPECIALCHARS
(integer )
HTML_ENTITIES
(integer )
ENT_COMPAT
(integer )
ENT_QUOTES
(integer )
ENT_NOQUOTES
(integer )
CHAR_MAX
(integer )
LC_CTYPE
(integer )
LC_NUMERIC
(integer )
LC_TIME
(integer )
LC_COLLATE
(integer )
LC_MONETARY
(integer )
LC_ALL
(integer )
LC_MESSAGES
(integer )
STR_PAD_LEFT
(integer )
STR_PAD_RIGHT
(integer )
STR_PAD_BOTH
(integer )
Table of Contents
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 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 encryption (hashing) echo — Output one or more strings explode — Split a string by 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 html_entity_decode — Convert all HTML entities to their applicable 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() 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 — 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 (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_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_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 position of first occurrence of a case-insensitive string 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 strpbrk — Search a string for any of a set of 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 strripos — Find position of last occurrence of a case-insensitive string in 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_compare — Binary safe comparison of 2 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