The string functions allow you to manipulate strings.
The string functions are part of the PHP core. There is no installation
needed to use these functions.
| Function |
Description |
PHP |
| addcslashes() |
Returns a string with backslashes in front of the specified
characters |
4 |
| addslashes() |
Returns a string with backslashes in front of predefined
characters |
3 |
| bin2hex() |
Converts a string of ASCII characters to hexadecimal values |
3 |
| chop() |
Alias of rtrim() |
3 |
| chr() |
Returns a character from a specified ASCII value |
3 |
| chunk_split() |
Splits a string into a series of smaller parts |
3 |
| convert_cyr_string() |
Converts a string from one Cyrillic character-set to another |
3 |
| convert_uudecode() |
Decodes a uuencoded string |
5 |
| convert_uuencode() |
Encodes a string using the uuencode algorithm |
5 |
| count_chars() |
Returns how many times an ASCII character occurs within a
string and returns the information |
4 |
| crc32() |
Calculates a 32-bit CRC for a string |
4 |
| crypt() |
One-way string encryption (hashing) |
3 |
| echo() |
Outputs strings |
3 |
| explode() |
Breaks a string into an array |
3 |
| fprintf() |
Writes a formatted string to a specified output stream |
5 |
| get_html_translation_table() |
Returns the translation table used by htmlspecialchars()
and htmlentities() |
4 |
| hebrev() |
Converts Hebrew text to visual text |
3 |
| hebrevc() |
Converts Hebrew text to visual text and new lines (\n) into
<br /> |
3 |
| html_entity_decode() |
Converts HTML entities to characters |
4 |
| htmlentities() |
Converts characters to HTML entities |
3 |
| htmlspecialchars_decode() |
Converts some predefined HTML entities to characters |
5 |
| htmlspecialchars() |
Converts some predefined characters to HTML entities |
3 |
| implode() |
Returns a string from the elements of an array |
3 |
| join() |
Alias of implode() |
3 |
| levenshtein() |
Returns the Levenshtein distance between two strings |
3 |
| localeconv() |
Returns locale numeric and monetary formatting information |
4 |
| ltrim() |
Strips whitespace from the left side of a string |
3 |
| md5() |
Calculates the MD5 hash of a string |
3 |
| md5_file() |
Calculates the MD5 hash of a file |
4 |
| metaphone() |
Calculates the metaphone key of a string |
4 |
| money_format() |
Returns a string formatted as a currency string |
4 |
| nl_langinfo() |
Returns specific local information |
4 |
| nl2br() |
Inserts HTML line breaks in front
of each newline in a string |
3 |
| number_format() |
Formats a number with grouped thousands |
3 |
| ord() |
Returns the ASCII value of the first character of a string |
3 |
| parse_str() |
Parses a query string into variables |
3 |
| print() |
Outputs a string |
3 |
| printf() |
Outputs a formatted string |
3 |
| quoted_printable_decode() |
Decodes a quoted-printable string |
3 |
| quotemeta() |
Quotes meta characters |
3 |
| rtrim() |
Strips whitespace from the right side of a string |
3 |
| setlocale() |
Sets locale information |
3 |
| sha1() |
Calculates the SHA-1 hash of a string |
4 |
| sha1_file() |
Calculates the SHA-1 hash of a file |
4 |
| similar_text() |
Calculates the similarity between two strings |
3 |
| soundex() |
Calculates the soundex key of a string |
3 |
| sprintf() |
Writes a formatted string to a variable |
3 |
| sscanf() |
Parses input from a string according to a format |
4 |
| str_ireplace() |
Replaces some characters in a
string (case-insensitive) |
5 |
| str_pad() |
Pads a string to a new length |
4 |
| str_repeat() |
Repeats a string a specified number of times |
4 |
| str_replace() |
Replaces some characters in a
string (case-sensitive) |
3 |
| str_rot13() |
Performs the ROT13 encoding on a string |
4 |
| str_shuffle() |
Randomly shuffles all characters in a string |
4 |
| str_split() |
Splits a string into an array |
5 |
| str_word_count() |
Count the number of words in a string |
4 |
| strcasecmp() |
Compares two strings (case-insensitive) |
3 |
| strchr() |
Finds the first occurrence of a string inside another
string (alias of strstr()) |
3 |
| strcmp() |
Compares two strings (case-sensitive) |
3 |
| strcoll() |
Locale based string comparison |
4 |
| strcspn() |
Returns the number of characters found in a string before
any part of some specified characters are found |
3 |
| strip_tags() |
Strips HTML and PHP tags from a string |
3 |
| stripcslashes() |
Unquotes a string quoted with addcslashes() |
4 |
| stripslashes() |
Unquotes a string quoted with addslashes() |
3 |
| stripos() |
Returns the position of the first occurrence of a string
inside another string (case-insensitive) |
5 |
| stristr() |
Finds the first occurrence of a string inside another
string (case-insensitive) |
3 |
| strlen() |
Returns the length of a string |
3 |
| strnatcasecmp() |
Compares two strings using a "natural order"
algorithm (case-insensitive) |
4 |
| strnatcmp() |
Compares two strings using a "natural order"
algorithm (case-sensitive) |
4 |
| strncasecmp() |
String comparison of the first
n characters (case-insensitive) |
4 |
| strncmp() |
String comparison of the first
n characters (case-sensitive) |
4 |
| strpbrk() |
Searches a string for any of a set of characters |
5 |
| strpos() |
Returns the position of the first occurrence of a string
inside another string (case-sensitive) |
3 |
| strrchr() |
Finds the last occurrence of a string inside another
string |
3 |
| strrev() |
Reverses a string |
3 |
| strripos() |
Finds the position of the last occurrence of a
string inside another string (case-insensitive) |
5 |
| strrpos() |
Finds the position of the last occurrence of a
string inside another string (case-sensitive) |
3 |
| strspn() |
Returns the number of characters found in a string that
contains only characters from a specified charlist |
3 |
| strstr() |
Finds the first occurrence of a string inside another
string (case-sensitive) |
3 |
| strtok() |
Splits a string into smaller strings |
3 |
| strtolower() |
Converts a string to lowercase letters |
3 |
| strtoupper() |
Converts a string to uppercase letters |
3 |
| strtr() |
Translates certain characters in a string |
3 |
| substr() |
Returns a part of a string |
3 |
| substr_compare() |
Compares two strings from a specified start position (binary safe
and optionally case-sensitive) |
5 |
| substr_count() |
Counts the number of times a substring occurs in a string |
4 |
| substr_replace() |
Replaces a part of a string with another string |
4 |
| trim() |
Strips whitespace from both sides of a
string |
3 |
| ucfirst() |
Converts the first character of a string to uppercase |
3 |
| ucwords() |
Converts the first character of each word in a string to uppercase |
3 |
| vfprintf() |
Writes a formatted string to a specified output stream |
5 |
| vprintf() |
Outputs a formatted string |
4 |
| vsprintf() |
Writes a formatted string to a variable |
4 |
| wordwrap() |
Wraps a string to a given number of characters |
4 |
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