| addcslashes() | Quote string with slashes in a C style. |
| addslashes() | Quote string with slashes. |
| bin2hex() | Convert binary data into hexadecimal representation. |
| 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 polynomial of a string. |
| crypt() | One-way string 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. |
| hex2bin() | Decodes a hexadecimally encoded binary string. |
| htmlentities() | Convert all applicable characters to HTML entities. |
| htmlspecialchars() | Convert special characters to HTML entities. |
| htmlspecialchars_decode() | Convert special HTML entities back to characters. |
| html_entity_decode() | Convert all HTML entities to their applicable characters. |
| implode() | Join array elements with a string. |
| 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() | Calculate the hash of a string. |
| md5_file() | Calculates the md5 hash of a given file. |
| metaphone() | Calculate the key of a string. |
| money_format() | Formats a number as a currency string. |
| nl2br() | Inserts HTML line breaks before all newlines in a string. |
| nl_langinfo() | Query language and locale information. |
| 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. |
| 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() | Calculate the hash of a string. |
| sha1_file() | Calculate the sha1 hash of a file. |
| similar_text() | Calculate the similarity between two strings. |
| soundex() | Calculate the key of a string. |
| sscanf() | Parses input from a string according to a format. |
| strcasecmp() | Binary safe case-insensitive string comparison. |
| strcmp() | Binary safe string comparison. |
| strcoll() | Locale based string comparison. |
| strcspn() | Find length of initial segment not matching mask. |
| 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. |
| strip_tags() | Strip HTML and PHP tags from a 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. |
| 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. |
| substr() | Return part of a string. |
| 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. |
| 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. |