Php

Front 1

string addcslashes ( string $str , string $charlist )

Back 1

Returns a string with backslashes before characters that are listed in charlist parameter.

Front 2

string addslashes ( string $str )

Back 2

Returns a string with backslashes before characters that need to be quoted in database queries etc. These characters are single quote ('), double quote ("), backslash (\) and NUL (the NULL byte).

Front 3

string bin2hex ( string $str )

Back 3

Returns an ASCII string containing the hexadecimal representation of str . The conversion is done byte-wise with the high-nibble first.

Front 4

string chr ( int $ascii )

Back 4

Returns a one-character string containing the character specified by ascii .

Front 5

string chunk_split ( string $body [, int $chunklen [, string $end ]] )

Back 5

Can be used to split a string into smaller chunks which is useful for e.g. converting base64_encode() output to match RFC 2045 semantics. It inserts end every chunklen characters.

Front 6

string convert_cyr_string ( string $str , string $from , string $to )

Back 6

Converts from one Cyrillic character set to another.

Front 7

string convert_uudecode ( string $data )

Back 7

convert_uudecode() decodes a uuencoded string.

Front 8

string convert_uuencode ( string $data )

Back 8

convert_uuencode() encodes a string using the uuencode algorithm.

Uuencode translates all strings (including binary's ones) into printable characters, making them safe for network transmissions. Uuencoded data is about 35% larger than the original.

Front 9

mixed count_chars ( string $string [, int $mode ] )

Back 9

Counts the number of occurrences of every byte-value (0..255) in string and returns it in various ways.

Front 10

int crc32 ( string $str )

Back 10

Generates the cyclic redundancy checksum polynomial of 32-bit lengths of the str . This is usually used to validate the integrity of data being transmitted.

Because PHP's integer type is signed, and many crc32 checksums will result in negative integers, you need to use the "%u" formatter of sprintf() or printf() to get the string representation of the unsigned crc32 checksum.

Front 11

string crypt ( string $str [, string $salt ] )

Back 11

crypt() will return an encrypted string using the standard Unix DES-based encryption algorithm or alternative algorithms that may be available on the system.

Front 12

void echo ( string $arg1 [, string $... ] )

Back 12

Outputs all parameters.

echo() is not actually a function (it is a language construct), so you are not required to use parentheses with it. echo() (unlike some other language constructs) does not behave like a function, so it cannot always be used in the context of a function. Additionally, if you want to pass more than one parameter to echo(), the parameters must not be enclosed within parentheses.

Front 13

array explode ( string $delimiter , string $string [, int $limit ] )

Back 13

Returns an array of strings, each of which is a substring of string formed by splitting it on boundaries formed by the string delimiter .

Front 14

int fprintf ( resource $handle , string $format [, mixed $args [, mixed $... ]] )

Back 14

Write a string produced according to format to the stream resource specified by handle .

Front 15

array get_html_translation_table ([ int $table [, int $quote_style ]] )

Back 15

get_html_translation_table() will return the translation table that is used internally for htmlspecialchars() and htmlentities().

Front 16

string html_entity_decode ( string $string [, int $quote_style [, string $charset ]] )

Back 16

html_entity_decode() is the opposite of htmlentities() in that it converts all HTML entities to their applicable characters from string .

Front 17

string htmlentities ( string $string [, int $quote_style [, string $charset [, bool $double_encode ]]] )

Back 17

This function is identical to htmlspecialchars() in all ways, except with htmlentities(), all characters which have HTML character entity equivalents are translated into these entities.

If you're wanting to decode instead (the reverse) you can use html_entity_decode().

Front 18

string htmlspecialchars_decode ( string $string [, int $quote_style ] )

Back 18

This function is the opposite of htmlspecialchars(). It converts special HTML entities back to characters.

The converted entities are: &, " (when ENT_NOQUOTES is not set), ' (when ENT_QUOTES is set), < and >.

Front 19

string htmlspecialchars ( string $string [, int $quote_style [, string $charset [, bool $double_encode ]]] )

Back 19

Certain characters have special significance in HTML, and should be represented by HTML entities if they are to preserve their meanings. This function returns a string with some of these conversions made; the translations made are those most useful for everyday web programming. If you require all HTML character entities to be translated, use htmlentities() instead.

Front 20

string implode ( string $glue , array $pieces )

Back 20

Join array elements with a glue string.

Front 21

int levenshtein ( string $str1 , string $str2 [, int $cost_ins ], int $cost_rep , int $cost_del )

Back 21

This function returns the Levenshtein-Distance between the two argument strings or -1, if one of the argument strings is longer than the limit of 255 characters.

The Levenshtein distance is defined as the minimal number of characters you have to replace, insert or delete to transform str1 into str2 . The complexity of the algorithm is O(m*n), where n and m are the length of str1 and str2 (rather good when compared to similar_text(), which is O(max(n,m)**3), but still expensive).

Front 22

array localeconv ( void )

Back 22

Returns an associative array containing localized numeric and monetary formatting information.

Front 23

string ltrim ( string $str [, string $charlist ] )

Back 23

Strip whitespace (or other characters) from the beginning of a string.

Front 24

string md5_file ( string $filename [, bool $raw_output ] )

Back 24

Calculates the MD5 hash of the file specified by the filename parameter using the » RSA Data Security, Inc. MD5 Message-Digest Algorithm, and returns that hash. The hash is a 32-character hexadecimal number.

Front 25

string md5 ( string $str [, bool $raw_output ] )

Back 25

Calculates the MD5 hash of str using the » RSA Data Security, Inc. MD5 Message-Digest Algorithm, and returns that hash.

Front 26

string metaphone ( string $str [, int $phones ] )

Back 26

Calculates the metaphone key of str .

Similar to soundex() metaphone creates the same key for similar sounding words. It's more accurate than soundex() as it knows the basic rules of English pronunciation. The metaphone generated keys are of variable length.

Metaphone was developed by Lawrence Philips <lphilips at verity dot com>. It is described in ["Practical Algorithms for Programmers", Binstock & Rex, Addison Wesley, 1995].

Front 27

string money_format ( string $format , float $number )

Back 27

money_format() returns a formatted version of number . This function wraps the C library function strfmon(), with the difference that this implementation converts only one number at a time.

Front 28

string nl_langinfo ( int $item )

Back 28

nl_langinfo() is used to access individual elements of the locale categories. Unlike localeconv(), which returns all of the elements, nl_langinfo() allows you to select any specific element.

Front 29

string nl2br ( string $string )

Back 29

Returns string with '<br />' inserted before all newlines.

Front 30

string number_format ( float $number [, int $decimals [, string $dec_point ]], string $thousands_sep )

Back 30

number_format() returns a formatted version of number . This function accepts either one, two or four parameters (not three):

If only one parameter is given, number will be formatted without decimals, but with a comma (",") between every group of thousands.

If two parameters are given, number will be formatted with decimals decimals with a dot (".") in front, and a comma (",") between every group of thousands.

If all four parameters are given, number will be formatted with decimals decimals, dec_point instead of a dot (".") before the decimals and thousands_sep instead of a comma (",") between every group of thousands.

Only the first character of thousands_sep is used. For example, if you use bar as thousands_sep on the number 1000, number_format() will return 1b000.

Front 31

int ord ( string $string )

Back 31

Returns the ASCII value of the first character of string .

This function complements chr().

Front 32

void parse_str ( string $str [, array &$arr ] )

Back 32

Parses str as if it were the query string passed via a URL and sets variables in the current scope.

Front 33

int print ( string $arg )

Back 33

Outputs arg .

print() is not actually a real function (it is a language construct) so you are not required to use parentheses with its argument list.

Front 34

int printf ( string $format [, mixed $args [, mixed $... ]] )

Back 34

Produces output according to format .

Front 35

string quoted_printable_decode ( string $str )

Back 35

This function returns an 8-bit binary string corresponding to the decoded quoted printable string (according to » RFC2045, section 6.7, not » RFC2821, section 4.5.2, so additional periods are not stripped from the beginning of line).

This function is similar to imap_qprint(), except this one does not require the IMAP module to work.

Front 36

string quotemeta ( string $str )

Back 36

Returns a version of str with a backslash character (\) before every character that is among these:

. \ + * ? [ ^ ] ( $ )

Front 37

string rtrim ( string $str [, string $charlist ] )

Back 37

This function returns a string with whitespace stripped from the end of str .

Front 38

string setlocale ( int $category , string $locale [, string $... ] )

Back 38

Sets locale information.

Front 39

string sha1_file ( string $filename [, bool $raw_output ] )

Back 39

Calculates the sha1 hash of filename using the » US Secure Hash Algorithm 1, and returns that hash. The hash is a 40-character hexadecimal number.

Front 40

string sha1 ( string $str [, bool $raw_output ] )

Back 40

Calculates the sha1 hash of str using the » US Secure Hash Algorithm 1,

Front 41

int similar_text ( string $first , string $second [, float &$percent ] )

Back 41

This calculates the similarity between two strings as described in Oliver [1993]. Note that this implementation does not use a stack as in Oliver's pseudo code, but recursive calls which may or may not speed up the whole process. Note also that the complexity of this algorithm is O(N**3) where N is the length of the longest string.

Front 42

string soundex ( string $str )

Back 42

Calculates the soundex key of str .

Soundex keys have the property that words pronounced similarly produce the same soundex key, and can thus be used to simplify searches in databases where you know the pronunciation but not the spelling. This soundex function returns a string 4 characters long, starting with a letter.

This particular soundex function is one described by Donald Knuth in "The Art Of Computer Programming, vol. 3: Sorting And Searching", Addison-Wesley (1973), pp. 391-392.

Front 43

string sprintf ( string $format [, mixed $args [, mixed $... ]] )

Back 43

Returns a string produced according to the formatting string format .

Front 44

mixed sscanf ( string $str , string $format [, mixed &$... ] )

Back 44

The function sscanf() is the input analog of printf(). sscanf() reads from the string str and interprets it according to the specified format , which is described in the documentation for sprintf(). If only two parameters were passed to this function, the values parsed will be returned as an array. Otherwise, if optional parameters are passed, the function will return the number of assigned values. The optional parameters must be passed by reference.

Any whitespace in the format string matches any whitespace in the input string. This means that even a tab \t in the format string can match a single space character in the input string.

Front 45

mixed str_ireplace ( mixed $search , mixed $replace , mixed $subject [, int &$count ] )

Back 45

This function returns a string or an array with all occurrences of search in subject (ignoring case) replaced with the given replace value. If you don't need fancy replacing rules, you should generally use this function instead of eregi_replace() or preg_replace() with the i modifier.

Front 46

string str_pad ( string $input , int $pad_length [, string $pad_string [, int $pad_type ]] )

Back 46

This functions returns the input string padded on the left, the right, or both sides to the specified padding length. If the optional argument pad_string is not supplied, the input is padded with spaces, otherwise it is padded with characters from pad_string up to the limit.

Front 47

string str_repeat ( string $input , int $multiplier )

Back 47

Returns input repeated multiplier times.

Front 48

mixed str_replace ( mixed $search , mixed $replace , mixed $subject [, int &$count ] )

Back 48

This function returns a string or an array with all occurrences of search in subject replaced with the given replace value.

If you don't need fancy replacing rules (like regular expressions), you should always use this function instead of ereg_replace() or preg_replace().

Front 49

string str_rot13 ( string $str )

Back 49

Performs the ROT13 encoding on the str argument and returns the resulting string.

The ROT13 encoding simply shifts every letter by 13 places in the alphabet while leaving non-alpha characters untouched. Encoding and decoding are done by the same function, passing an encoded string as argument will return the original version.

Front 50

string str_shuffle ( string $str )

Back 50

str_shuffle() shuffles a string. One permutation of all possible is created.

Front 51

array str_split ( string $string [, int $split_length ] )

Back 51

Converts a string to an array.

Front 52

mixed str_word_count ( string $string [, int $format [, string $charlist ]] )

Back 52

Counts the number of words inside string . If the optional format is not specified, then the return value will be an integer representing the number of words found. In the event the format is specified, the return value will be an array, content of which is dependent on the format . The possible value for the format and the resultant outputs are listed below.

For the purpose of this function, 'word' is defined as a locale dependent string containing alphabetic characters, which also may contain, but not start with "'" and "-" characters.

Front 53

int strcasecmp ( string $str1 , string $str2 )

Back 53

Binary safe case-insensitive string comparison.

Front 54

int strcmp ( string $str1 , string $str2 )

Back 54

Note that this comparison is case sensitive.

Front 55

int strcoll ( string $str1 , string $str2 )

Back 55

Note that this comparison is case sensitive, and unlike strcmp() this function is not binary safe.

strcoll() uses the current locale for doing the comparisons. If the current locale is C or POSIX, this function is equivalent to strcmp().

Front 56

int strcspn ( string $str1 , string $str2 [, int $start [, int $length ]] )

Back 56

Returns the length of the initial segment of str1 which does not contain any of the characters in str2 .

Front 57

string strip_tags ( string $str [, string $allowable_tags ] )

Back 57

This function tries to return a string with all HTML and PHP tags stripped from a given str . It uses the same tag stripping state machine as the fgetss() function.

Front 58

string stripcslashes ( string $str )

Back 58

Returns a string with backslashes stripped off. Recognizes C-like \n, \r ..., octal and hexadecimal representation.

Front 59

int stripos ( string $haystack , string $needle [, int $offset ] )

Back 59

Returns the numeric position of the first occurrence of needle in the haystack string.

Unlike strpos(), stripos() is case-insensitive.

Front 60

string stripslashes ( string $str )

Back 60

Un-quotes a quoted string.

Front 61

string stristr ( string $haystack , string $needle , bool $before_needle )

Back 61

Returns all of haystack from the first occurrence of needle to the end.

Front 62

int strlen ( string $string )

Back 62

Returns the length of the given string .

Front 63

int strnatcasecmp ( string $str1 , string $str2 )

Back 63

This function implements a comparison algorithm that orders alphanumeric strings in the way a human being would. The behaviour of this function is similar to strnatcmp(), except that the comparison is not case sensitive. For more information see: Martin Pool's » Natural Order String Comparison page.

Front 64

int strnatcmp ( string $str1 , string $str2 )

Back 64

This function implements a comparison algorithm that orders alphanumeric strings in the way a human being would, this is described as a "natural ordering". Note that this comparison is case sensitive.

Front 65

int strncasecmp ( string $str1 , string $str2 , int $len )

Back 65

This function is similar to strcasecmp(), with the difference that you can specify the (upper limit of the) number of characters from each string to be used in the comparison.

Front 66

int strncmp ( string $str1 , string $str2 , int $len )

Back 66

This function is similar to strcmp(), with the difference that you can specify the (upper limit of the) number of characters from each string to be used in the comparison.

Note that this comparison is case sensitive.

Front 67

string strpbrk ( string $haystack , string $char_list )

Back 67

strpbrk() searches the haystack string for a char_list .

Front 68

int strpos ( string $haystack , mixed $needle [, int $offset ] )

Back 68

Returns the numeric position of the first occurrence of needle in the haystack string. Unlike the strrpos() before PHP 5, this function can take a full string as the needle parameter and the entire string will be used.

Front 69

string strrchr ( string $haystack , string $needle )

Back 69

This function returns the portion of haystack which starts at the last occurrence of needle and goes until the end of haystack .

Front 70

string strrev ( string $string )

Back 70

Returns string , reversed.

Front 71

int strripos ( string $haystack , string $needle [, int $offset ] )

Back 71

Find position of last occurrence of a case-insensitive string in a string. Unlike strrpos(), strripos() is case-insensitive.

Front 72

int strrpos ( string $haystack , string $needle [, int $offset ] )

Back 72

Returns the numeric position of the last occurrence of needle in the haystack string. Note that the needle in this case can only be a single character in PHP 4. If a string is passed as the needle, then only the first character of that string will be used.

If needle is not found, returns FALSE.

It is easy to mistake the return values for "character found at position 0" and "character not found". Here's how to detect the difference:

Front 73

int strspn ( string $str1 , string $str2 [, int $start [, int $length ]] )

Back 73

Finds the length of the initial segment matching mask.

Front 74

string strstr ( string $haystack , string $needle , bool $before_needle )

Back 74

Returns part of haystack string from the first occurrence of needle to the end of haystack .

Front 75

string strtok ( string $str , string $token )

Back 75

strtok() splits a string (str ) into smaller strings (tokens), with each token being delimited by any character from token . That is, if you have a string like "This is an example string" you could tokenize this string into its individual words by using the space character as the token.

Front 76

string strtolower ( string $str )

Back 76

Returns string with all alphabetic characters converted to lowercase.

Note that 'alphabetic' is determined by the current locale. This means that in i.e. the default "C" locale, characters such as umlaut-A (Ä) will not be converted.

Front 77

string strtoupper ( string $string )

Back 77

Returns string with all alphabetic characters converted to uppercase.

Note that 'alphabetic' is determined by the current locale. For instance, in the default "C" locale characters such as umlaut-a (ä) will not be converted.

Front 78

string strtr ( string $str , string $from , string $to )

Back 78

This function returns a copy of str , translating all occurrences of each character in from to the corresponding character in to .

If from and to are different lengths, the extra characters in the longer of the two are ignored.

Front 79

int substr_compare ( string $main_str , string $str , int $offset [, int $length [, bool $case_insensitivity ]] )

Back 79

substr_compare() compares main_str from position offset with str up to length characters.

Front 80

int substr_count ( string $haystack , string $needle [, int $offset [, int $length ]] )

Back 80

substr_count() returns the number of times the needle substring occurs in the haystack string. Please note that needle is case sensitive.

Front 81

mixed substr_replace ( mixed $string , string $replacement , int $start [, int $length ] )

Back 81

substr_replace() replaces a copy of string delimited by the start and (optionally) length parameters with the string given in replacement .

Front 82

string substr ( string $string , int $start [, int $length ] )

Back 82

Returns the portion of string specified by the start and length parameters.

Front 83

string trim ( string $str [, string $charlist ] )

Back 83

This function returns a string with whitespace stripped from the beginning and end of str . Without the second parameter, trim() will strip these characters:

* " " (ASCII 32 (0x20)), an ordinary space.
* "\t" (ASCII 9 (0x09)), a tab.
* "\n" (ASCII 10 (0x0A)), a new line (line feed).
* "\r" (ASCII 13 (0x0D)), a carriage return.
* "\0" (ASCII 0 (0x00)), the NUL-byte.
* "\x0B" (ASCII 11 (0x0B)), a vertical tab.

Front 84

string ucfirst ( string $str )

Back 84

Returns a string with the first character of str capitalized, if that character is alphabetic.

Note that 'alphabetic' is determined by the current locale. For instance, in the default "C" locale characters such as umlaut-a (ä) will not be converted.

Front 85

string ucwords ( string $str )

Back 85

Returns a string with the first character of each word in str capitalized, if that character is alphabetic.

The definition of a word is any string of characters that is immediately after a whitespace (These are: space, form-feed, newline, carriage return, horizontal tab, and vertical tab).

Front 86

int vfprintf ( resource $handle , string $format , array $args )

Back 86

Write a string produced according to format to the stream resource specified by handle .

Operates as fprintf() but accepts an array of arguments, rather than a variable number of arguments.

Front 87

int vprintf ( string $format , array $args )

Back 87

Display array values as a formatted string according to format (which is described in the documentation for sprintf()).

Operates as printf() but accepts an array of arguments, rather than a variable number of arguments.

Front 88

string vsprintf ( string $format , array $args )

Back 88

Operates as sprintf() but accepts an array of arguments, rather than a variable number of arguments.

Front 89

string wordwrap ( string $str [, int $width [, string $break [, bool $cut ]]] )

Back 89

Wraps a string to a given number of characters using a string break character.