PHP 5 StringFunctions
PHP 5 String Functions
PHP String functions are part of the PHP core. No installation is required to use these functions.
| Function | Description |
|---|---|
| addcslashes() | Returns a string with backslashes added before specified characters. |
| addslashes() | Returns a string with backslashes added before predefined characters. |
| bin2hex() | Converts a string of ASCII characters to hexadecimal values. |
| chop() | Removes whitespace or other characters from the right side of a string. |
| chr() | Returns a character from a specified ASCII value. |
| chunk_split() | Splits a string into a series of smaller parts. |
| convert_cyr_string() | Converts a string from one Cyrillic character set to another. |
| convert_uudecode() | Decodes a uuencoded string. |
| convert_uuencode() | Encodes a string using the uuencode algorithm. |
| count_chars() | Returns information about characters used in a string. |
| crc32() | Calculates a 32-bit CRC (Cyclic Redundancy Checksum) for a string. |
| crypt() | One-way string hashing. |
| echo() | Outputs one or more strings. |
| explode() | Breaks a 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() | Converts Hebrew text to visible text. |
| hebrevc() | Converts Hebrew text to visible text and converts newlines (\n) to <br>. |
| hex2bin() | Converts a string of hexadecimal values to ASCII characters. |
| html_entity_decode() | Converts HTML entities to characters. |
| htmlentities() | Converts characters to HTML entities. |
| htmlspecialchars_decode() | Converts some predefined HTML entities to characters. |
| htmlspecialchars() | Converts some predefined characters to HTML entities. |
| implode() | Returns a string composed of array elements. |
| join() | Alias of implode(). |
| lcfirst() | Converts the first character of a string to lowercase. |
| levenshtein() | Returns the Levenshtein distance between two strings. |
| localeconv() | Returns local numeric and currency formatting information. |
| ltrim() | Removes whitespace or other characters from the left side of a string. |
| md5() | Calculates the MD5 hash of a string. |
| md5_file() | Calculates the MD5 hash of a file. |
| metaphone() | Calculates the metaphone key of a string. |
| money_format() | Returns a string formatted as a currency string. |
| nl_langinfo() | Returns the specified locale information. |
| nl2br() | Inserts HTML line breaks before each newline in a string. |
| number_format() | Formats a number with grouped thousands. |
| ord() | Returns the ASCII value of the first character of a string. |
| parse_str() | Parses a query string into variables. |
| print() | Outputs one or more strings. |
| printf() | Outputs a formatted string. |
| quoted_printable_decode() | Converts a quoted-printable string to an 8-bit string. |
| quoted_printable_encode() | Converts an 8-bit string to a quoted-printable string. |
| quotemeta() | Quotes meta characters. |
| rtrim() | Removes whitespace or other characters from the right side of a string. |
| setlocale() | Sets locale information. |
| sha1() | Calculates the SHA-1 hash of a string. |
| sha1_file() | Calculates the SHA-1 hash of a file. |
| similar_text() | Calculates the similarity between two strings. |
| soundex() | Calculates the soundex key of a string. |
| sprintf() | Writes a formatted string to a variable. |
| sscanf() | Parses input from a string according to a specified format. |
| str_getcsv() | Parses a CSV string into an array. |
| str_ireplace() | Replaces some characters in a string (case-insensitive). |
| str_pad() | Pads a string to a new length. |
| str_repeat() | Repeats a string a specified number of times. |
| str_replace() | Replaces some characters in a string (case-sensitive). |
| str_rot13() | Performs ROT13 encoding on a string. |
| str_shuffle() | Shuffles all characters in a string randomly. |
| str_split() | Splits a string into an array. |
| str_word_count() | Counts the number of words in a string. |
| strcasecmp() | Compares two strings (case-insensitive). |
| strchr() | Finds the first occurrence of a string in another string. (Alias of strstr().) |
| strcmp() | Compares two strings (case-sensitive). |
| strcoll() | Compares two strings (according to locale settings). |
| strcspn() | Returns the number of characters found in a string before any of the specified characters are found. |
| strip_tags() | Strips HTML and PHP tags from a string. |
| stripcslashes() | Removes backslashes added by the addcslashes() function. |
| stripslashes() | Removes backslashes added by the addslashes() function. |
| stripos() | Returns the position of the first occurrence of a string in another string (case-insensitive). |
| stristr() | Finds the position of the first occurrence of a string in another string (case-insensitive). |
| strlen() | Returns the length of a string. For handling Chinese strings, usemb_strlen() function。 |
| strnatcasecmp() | Compares two strings using a "natural order" algorithm (case-insensitive). |
| strnatcmp() | Compares two strings using a "natural order" algorithm (case-sensitive). |
| strncasecmp() | Compares the first n characters of strings (case-insensitive). |
| strncmp() | Compares the first n characters of strings (case-sensitive). |
| strpbrk() | Searches a string for any of the specified characters. |
| strpos() | Returns the position of the first occurrence of a string in another string (case-sensitive). |
| strrchr() | Finds the last occurrence of a string in another string. |
| strrev() | Reverses a string. |
| strripos() | Finds the position of the last occurrence of a string in another string (case-insensitive). |
| strrpos() | Finds the position of the last occurrence of a string in another string (case-sensitive). |
| strspn() | Returns the number of specified characters contained in a string. |
| strstr() | Finds the first occurrence of a string in another string (case-sensitive). |
| strtok() | Splits a string into smaller strings. |
| strtolower() | Converts a string to lowercase letters. |
| strtoupper() | Converts a string to uppercase letters. |
| strtr() | Translates specified characters in a string. |
| substr() | Returns a part of a string. |
| mb_substr() | Returns a part of a Chinese string. |
| substr_compare() | Compares two strings from a specified start position (binary-safe and optionally case-sensitive). |
| substr_count() | Counts the number of substring occurrences in a string. |
| substr_replace() | Replaces a part of a string with another string. |
| trim() | Removes whitespace and other characters from both sides of a string. |
| ucfirst() | Converts the first character of 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() | Outputs a formatted string. |
| vsprintf() | Writes a formatted string to a variable. |
| wordwrap() | Wraps a string to a specified length. |