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diff --git a/user_guide_src/source/helpers/string_helper.rst b/user_guide_src/source/helpers/string_helper.rst new file mode 100644 index 000000000..b8a69e036 --- /dev/null +++ b/user_guide_src/source/helpers/string_helper.rst @@ -0,0 +1,167 @@ +############# +String Helper +############# + +The String Helper file contains functions that assist in working with +strings. + +.. contents:: Page Contents + +Loading this Helper +=================== + +This helper is loaded using the following code + +:: + + $this->load->helper('string'); + +The following functions are available: + +random_string() +=============== + +Generates a random string based on the type and length you specify. +Useful for creating passwords or generating random hashes. + +The first parameter specifies the type of string, the second parameter +specifies the length. The following choices are available: + +alpha, alunum, numeric, nozero, unique, md5, encrypt and sha1 + +- **alpha**: A string with lower and uppercase letters only. +- **alnum**: Alpha-numeric string with lower and uppercase characters. +- **numeric**: Numeric string. +- **nozero**: Numeric string with no zeros. +- **unique**: Encrypted with MD5 and uniqid(). Note: The length + parameter is not available for this type. Returns a fixed length 32 + character string. +- **sha1**: An encrypted random number based on do_hash() from the + :doc:`security helper <security_helper>`. + +Usage example + +:: + + echo random_string('alnum', 16); + +increment_string() +================== + +Increments a string by appending a number to it or increasing the +number. Useful for creating "copies" or a file or duplicating database +content which has unique titles or slugs. + +Usage example + +:: + + echo increment_string('file', '_'); // "file_1" + echo increment_string('file', '-', 2); // "file-2" + echo increment_string('file-4'); // "file-5" + +alternator() +============ + +Allows two or more items to be alternated between, when cycling through +a loop. Example + +:: + + for ($i = 0; $i < 10; $i++) + { + echo alternator('string one', 'string two'); + } + +You can add as many parameters as you want, and with each iteration of +your loop the next item will be returned. + +:: + + for ($i = 0; $i < 10; $i++) + { + echo alternator('one', 'two', 'three', 'four', 'five'); + } + +.. note:: To use multiple separate calls to this function simply call the + function with no arguments to re-initialize. + +repeater() +========== + +Generates repeating copies of the data you submit. Example + +:: + + $string = "\n"; echo repeater($string, 30); + +The above would generate 30 newlines. + +reduce_double_slashes() +======================= + +Converts double slashes in a string to a single slash, except those +found in http://. Example + +:: + + $string = "http://example.com//index.php"; + echo reduce_double_slashes($string); // results in "http://example.com/index.php" + +trim_slashes() +============== + +Removes any leading/trailing slashes from a string. Example + +:: + + $string = "/this/that/theother/"; + echo trim_slashes($string); // results in this/that/theother + + +reduce_multiples() +================== + +Reduces multiple instances of a particular character occuring directly +after each other. Example:: + + $string = "Fred, Bill,, Joe, Jimmy"; + $string = reduce_multiples($string,","); //results in "Fred, Bill, Joe, Jimmy" + +The function accepts the following parameters: + +:: + + reduce_multiples(string: text to search in, string: character to reduce, boolean: whether to remove the character from the front and end of the string) + +The first parameter contains the string in which you want to reduce the +multiplies. The second parameter contains the character you want to have +reduced. The third parameter is FALSE by default; if set to TRUE it will +remove occurences of the character at the beginning and the end of the +string. Example: + +:: + + $string = ",Fred, Bill,, Joe, Jimmy,"; + $string = reduce_multiples($string, ", ", TRUE); //results in "Fred, Bill, Joe, Jimmy" + + +quotes_to_entities() +==================== + +Converts single and double quotes in a string to the corresponding HTML +entities. Example + +:: + + $string = "Joe's \"dinner\""; + $string = quotes_to_entities($string); //results in "Joe's "dinner"" + +strip_quotes() +============== + +Removes single and double quotes from a string. Example:: + + $string = "Joe's \"dinner\""; + $string = strip_quotes($string); //results in "Joes dinner" + |