The PHP String function is an integral part of PHP core. No installation is required to use these functions.
| function | describe |
|---|---|
| addcslashes() | Returns a string with a backslash preceding the specified character. |
| addslashes() | Returns a string preceded by a backslash to a predefined character. |
| bin2hex() | Converts a string of ASCII characters to a hexadecimal value. |
| chop() | Removes whitespace or other characters from the right side of a string. |
| chr() | Returns characters from the specified ASCII value. |
| chunk_split() | Split a string into a series of smaller parts. |
| convert_cyr_string() | Convert a string from one Cyrillic character set to another. |
| convert_uudecode() | Decodes a uuencoded string. |
| convert_uuencode() | Encode the string using the uuencode algorithm. |
| count_chars() | Returns information about the characters used in a string. |
| crc32() | Calculate the 32-bit CRC (cyclic redundancy check) of a string. |
| crypt() | One-way string encryption (hashing). |
| echo() | Output one or more strings. |
| explode() | Break the string into an array. |
| fprintf() | Writes a formatted string to the specified output stream. |
| get_html_translation_table() | Returns the translation table used by htmlspecialchars() and htmlentities(). |
| hebrev() | Convert Hebrew text to visible text. |
| hebrevc() | Convert Hebrew text to visible text and newlines (n) to <br>. |
| hex2bin() | Converts a string of hexadecimal values to ASCII characters. |
| html_entity_decode() | Convert HTML entities to characters. |
| htmlentities() | Convert characters to HTML entities. |
| htmlspecialchars_decode() | Convert some predefined HTML entities into characters. |
| htmlspecialchars() | Convert some predefined characters into HTML entities. |
| implode() | Returns a string composed of array elements. |
| join() | Alias for implode(). |
| lcfirst() | Converts the first character in a string to lowercase. |
| levenshtein() | Returns the Levenshtein distance between two strings. |
| localeconv() | Returns local number and currency format information. |
| ltrim() | Removes whitespace or other characters from the left side of a string. |
| md5() | Computes the MD5 hash of a string. |
| md5_file() | Calculate the MD5 hash of the file. |
| metaphone() | Calculates the metaphone key of a string. |
| money_format() | Returns a string formatted as a currency string. |
| nl_langinfo() | Returns the specified local information. |
| nl2br() | Inserts an HTML newline character before each new line in the string. |
| number_format() | Format numbers by thousands grouping. |
| ord() | Returns the ASCII value of the first character in a string. |
| parse_str() | Parse the query string into variables. |
| print() | Output one or more strings. |
| printf() | Output a formatted string. |
| quoted_printable_decode() | Convert a quoted-printable string to an 8-bit string. |
| quoted_printable_encode() | Convert an 8-bit string to a quoted-printable string. |
| quotemeta() | Quote metacharacters. |
| rtrim() | Removes whitespace or other characters from the right side of a string. |
| setlocale() | Set area information (regional information). |
| sha1() | Computes the SHA-1 hash of a string. |
| sha1_file() | Calculate the SHA-1 hash of the file. |
| similar_text() | Calculate the similarity of two strings. |
| soundex() | Calculate the soundex key of a string. |
| sprintf() | Write the formatted string into a variable. |
| sscanf() | Parses input from a string according to the specified format. |
| str_getcsv() | Parse CSV string into array. |
| str_ireplace() | Replace some characters in a string (case insensitive). |
| str_pad() | Pad the string to the new length. |
| str_repeat() | Repeat the string a specified number of times. |
| str_replace() | Replace some characters in a string (case sensitive). |
| str_rot13() | Perform ROT13 encoding on the string. |
| str_shuffle() | Randomly shuffle all characters in a string. |
| str_split() | Split the 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 within another string. (Alias for strstr().) |
| strcmp() | Compares two strings (case sensitive). |
| strcoll() | Compares two strings (according to local settings). |
| strcspn() | Returns the number of characters searched in a string before any specified character is found. |
| strip_tags() | Strip HTML and PHP tags from strings. |
| stripcslashes() | Remove backslashes added by the addcslashes() function. |
| stripslashes() | Remove backslashes added by the addslashes() function. |
| stripos() | Returns the position of the first occurrence of a string within another string (case insensitive). |
| stristr() | Finds the first occurrence of a string within another string (case insensitive). |
| strlen() | Returns the length of the string. |
| strnatcasecmp() | Compares two strings using a "natural ordering" algorithm (case-insensitive). |
| strnatcmp() | Compares two strings using a "natural ordering" algorithm (case sensitive). |
| strncasecmp() | String comparison of first n characters (case insensitive). |
| strncmp() | String comparison of first n characters (case sensitive). |
| strpbrk() | Searches a string for any of the specified characters. |
| strpos() | Returns the position of the first occurrence of a string within another string (case sensitive). |
| strrchr() | Finds the last occurrence of a string within another string. |
| strrev() | Reverse a string. |
| strripos() | Finds the last occurrence of a string within another string (case insensitive). |
| strrpos() | Finds the last occurrence of a string within another string (case sensitive). |
| strspn() | Returns the number of specific characters contained in a string. |
| strstr() | Finds the first occurrence of a string within another string (case sensitive). |
| strtok() | Split the string into smaller strings. |
| strtolower() | Convert a string to lowercase letters. |
| strtoupper() | Convert a string to uppercase letters. |
| strtr() | Convert specific characters in a string. |
| substr() | Returns part of a string. |
| substr_compare() | Compares two strings starting at a specified starting position (binary safe and optionally case-sensitive). |
| substr_count() | Counts the number of times a substring appears in a string. |
| substr_replace() | Replace part of a string with another string. |
| trim() | Removes whitespace and other characters from both sides of a string. |
| ucfirst() | Converts the first character in a string to uppercase. |
| ucwords() | Converts the first character of each word in a string to uppercase. |
| vfprintf() | Writes a formatted string to the specified output stream. |
| vprintf() | Output a formatted string. |
| vsprintf() | Write the formatted string into a variable. |
| wordwrap() | Wraps the string according to the specified length. |