A detailed description of string functions
Addcslashes-adds a backslash escape character for some characters inside a string
Grammar:
String Addcslashes (String $str, string $charlist);
Returns a string that has a backslash in front of the character in the parameter charlist list.
addslashes-characters inside a string are escaped in the specified manner
Grammar:
String addslashes (STRING$STR);
Returns a string that, for the purposes of the database query statement, is preceded by a backslash in front of some characters.
bin2hex-converts binary data to hexadecimal notation
Grammar:
String Bin2Hex (STRING$STR);
Returns an ASCII string that is the hexadecimal representation of the parameter str.
alias function for Chop-rtrim ()
chr-returns the ASCII code of a character
Grammar:
String chr (int $ascII);
Returns the character specified by the corresponding ASCII.
Chunk_split-divide a string into small pieces at a certain length of character
Grammar:
String Chunk_split (String $str [, int$length=7[,string $end = "\ r \ n"]);
Use this function to split a string into small chunks.
Convert_cyr_string-converting Slavic characters to other characters
Description
String convert_cyr_string (String $str, String $from, string $to);
This function converts the given string from one Cyrillic character to another, returning the converted string.
convert_uudecode-decrypting a string
Description
String Convert_uudecode (String $data)
Convert_uudecode () decodes a uuencode encoded string.
convert_uuencode-Encrypt a string
Description
String Convert_uuencode (String $data)
Convert_uuencode () encodes a string using the uuencode algorithm.
The uuencode algorithm converts all (including binary) strings into characters that can be output and can be safely applied to network transmissions. Data encoded using Uuencode will be about 35% larger than the source data.
count_chars-returns the character usage information for a string
Description
Mixed Count_chars (string $string [, int $mode = 0])
Counts each byte value in a string (0: 255) The number of occurrences, using multiple modes to return results.
crc32-computes a crc32 polynomial of a string
Description
int Crc32 (String $str)
Generates a 32-bit cyclic redundancy check code polynomial for str . This is typically used to check the integrity of the data being transmitted.
crypt-one-way hash encryption function
Description
String crypt (String $str [, String $salt])
Crypt () returns a hash string based on the standard UNIX DES algorithm or other available alternative algorithms on the system.
Echo-used to display some content
Description
void Echo (String $arg 1 [, String $ ...])
Output all parameters.
Echo is not a function (it's a language structure), so you don't have to use parentheses to indicate arguments, single quotes, double quotes. Echo (unlike other language constructs) does not behave like a function, so it is not always possible to use the context of a function. Also, if you want to pass multiple arguments to echo, you cannot use parentheses.
Explode-converts a string into an array form with a separator
Description
Array explode (string $delimiter, string $string [, int $limit])
This function returns an array of strings, each of which is a substring of string, separated by the delimiter of the strings as the boundary points.
fprintf-returns data as required and writes directly to the document stream
Description
int fprintf (Resource $handle, String $format [, Mixed $args [, mixed $ ...])
Writes a string that is formatted according to format into the stream opened by the handle handle.
Get_html_translation_table-returning HTML entities that can be converted
Description
Array get_html_translation_table ([int $table =html_specialchars [, int $flags = Ent_compat | ent_html401 [, String $encoding = ' UTF-8 ']])
Get_html_translation_table () returns the converted table after Htmlspecialchars () and htmlentities () processing.
Note:
Special characters can be used in a variety of ways. For example: " can be converted into ", & #34; or & #x22. Get_html_translation_table () returns one of the most commonly used.
hebrev-converting Hebrew encoded strings to visual text
Description
String Hebrev (String $hebrew _text [, int $max _chars_per_line = 0])
Convert logical Order Hebrew (logical-hebrew) to Visual Order Hebrew (visual-hebrew)
The function will try to avoid breaking words.
hebrevc-converting Hebrew encoded strings to visual text
Description
String Hebrevc (String $hebrew _text [, int $max _chars_per_line = 0])
The only difference between this function and Hebrev () is that this function converts additional line characters (\ n) to "<br>\n".
The function will try to avoid breaking words.
Inverse of the html_entity_decode-htmlentities () function to convert HTML entities to characters
Description
String Html_entity_decode (string $string [, int $flags =ent_compat | ent_html401 [, String $encoding =ini_get ("Default_charset")])
Html_entity_decode () is htmlentities () instead, it puts all the HTML entities in the string with its applicable characteristics.
Rather, this function will necessarily effectively select the file type-that is, the XML, which does not decode entities that may be in some DTD definitions and B-named) characters in the character set with the selected encoding and is allowed in the selected file type, for all entities (including all numeric entities). All the other entities are left behind.
htmlentities-convert some characters in a string to HTML entities
Description
String Htmlentities (string $string [, int $flags =ent_compat | ent_html401 [, String$encoding =ini_get ("Default_charset") [, BOOL $double _encode =true]])
This feature is Htmlspecialchars () in various ways the same, except Htmlentities (), all characters are translated into these entities as HTML character entity equivalents.
If you want to decode the opposite (reverse) you can use Html_entity_decode ().
Inverse of the htmlspecialchars_decode-htmlspecialchars () function to convert HTML entities to characters
Description
String Htmlspecialchars_decode (string $string [, int $flags =ent_compat | ENT_HTML401])
This function is exactly the opposite of Htmlspecialchars (). It converts special HTML entities back to normal characters.
The entities being converted are: &, " (when no ent_noquotes is set), & #039; (set Ent_ QUOTES ), < and >.
htmlspecialchars-convert some characters in a string to HTML entities
Description
String Htmlspecialchars (string $string [, int $flags =ent_compat | ent_html401 [, String$encoding =ini_get ("Default_charset") [, BOOL $double _encode =true]])
Some of the attributes in HTML have special meanings that should be given to HTML entities if they maintain their meaning. This function returns a string with these conversions. If you need to have the associated named entity translate all the substring of the input string, instead of using htmlentities ().
If the input string is passed to this function and the last file shares the same character set, this feature is fully prepared to contain the input most in an HTML document. If, however, the input can represent characters that are not encoded in the final Document character set, and you want to retain these characters (such as numbers or named entities), this feature and Htmlentities () (encoded only, named entity equivalents) may not be sufficient. You can use Mb_encode_numericentity () instead.
Translation methods:
' and ' (&) become "&"
"" (double quotes) becomes ' " when Ent_noquotes is not set.
"'" (single quote) becomes ' and # 039; "(or" only if ent_quotes is set;).
"<" (less than) becomes "<<"
">" (Greater Than) becomes ">"
implode-to convert an array to a string with a specific separator character
Description
String implode (string $glue, array $pieces)
String implode (array $pieces)
join-convert an array to a string, alias of the Implode () function
levenshtein-Calculate the difference size of two words
Description
int Levenshtein (String $str 1, String $str 2)
int Levenshtein (String $str 1, String $str 2, int $cost _ins, int $cost _rep, Int$cost_del)
Edit distance refers to the minimum number of characters required to str1 a string to be converted to a str2 by substitution, insertion, deletion, etc. between two strings. The complexity of the algorithm is O (m*n), where n and m are the lengths of str1 and str2 respectively (when and algorithm complexity is O (max (n,m) **3) Similar_text (), this function is quite good, although it is still time consuming. )。
In its simplest form, the function takes only two strings as arguments, and calculates the number of operations required to convert str1 to str2 by inserting, replacing, and deleting operations.
The second variant takes three additional parameters to define the number of INSERT, replace, and delete operations. This variant is more versatile and adaptable than the first, but less efficient.
localeconv-getting a number-related format definition
Description
Array localeconv (void)
Returns an array that contains localized numeric and currency formatting information.
ltrim-to remove whitespace to the left of a string or to a specified character
Description
String LTrim (String $str [, String $character _mask])
Remove whitespace characters (or other characters) at the beginning of a string
md5_file-a file for MD5 algorithm encryption
Description
String Md5_file (String $filename [, bool $raw _output =false])
Calculates the MD5 hash value of the filename file and returns it using the»RSA data security Company's MD5 message algorithm. The hash value is a hexadecimal number of 32 characters.
md5-a string for MD5 algorithm encryption
Description
String MD5 (string $str [, bool $raw _output =false])
The MD5 hash value of str is computed using the»RSA data security Company's MD5 message algorithm.
Metaphone-judging the pronunciation rules of a string
Description
String Metaphone (string $str [, int $phonemes = 0])
Calculate the Metaphone key for a structure
Similar soundex () Metaphone Create the same key for pronouncing similar words. It is more accurate than soundex () because it understands the basic rules of English pronunciation. The key length generated by the Metaphone is variable.
Voice is developed by Lawrence at <<lphilips Philips Real dot com >. It describes the ["utility algorithm", Binstock & Rex, Eddison, 1995].
money_format-output of numbers formatted according to parameters
Description
String Money_format (String $format, float)
Money_format () returns the version number of a format. The C library function of this feature Pack Strfmon (), this implementation will have only one number at a time difference.
nl_langinfo-querying language and local information
nl2br-replacing the newline character "\ n" in a string with "<br/>"
number_format-output of numbers formatted according to parameters
ord-converts an ASCII code to one character
parse_str-Convert a string of a certain format into a variable and a value
Print-used to output a single value
printf-data Display as required
Quoted_printable_decode-to encrypt a string into a 8-bit binary string
Quotemeta-to escape a number of specific characters
rtrim-remove whitespace to the right of a string or a specified character
setlocale-setting local formats for numbers, dates, and so on
sha1_file-a file for SHA1 algorithm encryption
Sha1-a string for SHA1 algorithm encryption
Similar_text-compares two strings and returns the number of similar characters that the system thinks
Soundex-judging the pronunciation rules of a string
The sprintf-returns the data as required, but does not output
sscanf-can format a string
str_ireplace-matches and replaces strings like the Str_replace () function, but is case insensitive
str_pad-padding on both sides of a string
str_repeat-repeating combinations of strings
str_replace-matching and replacing strings
str_rot13-string for ROT13 encryption processing
str_shuffle-random ordering of characters inside a string
str_split-splits a string into an array by character spacing
str_word_count-get the English word information inside the string
strcasecmp-size comparison of strings, case insensitive
Strchr-the alias of a partial strstr () function that returns a string by comparison
strcmp-size comparison of strings
strcoll– size comparison of strings based on local settings
strcspn-returns the value of a continuous non-matching length of characters
strip_tags-remove HTML and PHP code from a string
stripcslashes-inverse literal addcslashes () function escapes processed strings
Stripos-finds and returns the position of the first occurrence, matching is case-insensitive
stripslashes-inverse literal addslashes () function escapes processed strings
stristr-returns a portion of a string by comparison, case-insensitive compared
Strlen-gets the encoded length of a string
strnatcasecmp-the size comparison of strings using natural sorting, case-insensitive
strnatcmp-the size comparison of strings using the natural sort method
strncasecmp-size comparison of the first n characters of a string, case insensitive
strncmp-size comparison of the first n characters of a string
strpbrk-returns a portion of a string by comparison
strpos-Find and return the position of the first occurrence
strrchr-returns a part of a string by comparing it from backward to forward
strrev-all letters inside the string in reverse order
Strripos-finds and returns the position of the first match from the back, matching is case insensitive
strrpos– Find and return the position of the first match from behind
strspn-matches and returns the value of the character continuous occurrence length
strstr-returns a portion of a string by comparison
strtok-to split a string with a specified number of characters
strtolower-converting a string to lowercase
strtoupper– converting a string to uppercase
strtr-to string comparison substitution
Substr_compare-Comparison of strings after interception
substr_count-count occurrences of a character segment in a string
substr_replace-to replace part of a character in a string
substr-to intercept a string
trim-remove whitespace or specified characters on either side of a string
Ucfirst-converts the first letter of a given string to uppercase
ucwords-the first letter of each English word of the given string into uppercase
vfprintf-returns data as required and writes directly to the document stream
vprintf-data Display as required
The vsprintf-returns the data as required, but does not output
wordwrap-to divide a string by a certain character length
Summary of String functions