PHP Developer’s Dictionary IT-SC book 340 Syntax int xml_get_current_line_number (int parser) Description The xml_get_current_line_number() function, which was added in PHP 3.0.6 and PHP 4.0, returns the line number that the parser is currently processing. xml_get_current_column_number() Syntax int xml_get_current_column_number (int parser) Description The xml_get_current_column_number() function, which was added in PHP 3.0.6 and PHP 4.0, returns the column number on the current line that the parser is currently processing. xml_get_current_byte_index() Syntax int xml_get_current_byte_index (int parser) Description The xml_get_current_byte_index() function, which was added in PHP 3.0.6 and PHP 4.0, returns the byte index that the parser is currently processing. xml_parser_free() Syntax string xml_parser_free (int parser) PHP Developer’s Dictionary IT-SC book 341 Description The xml_parser_free() function, which was added in PHP 3.0.6 and PHP 4.0, frees the parser and returns TRUE if successful; otherwise, it returns FALSE. xml_parser_set_option() Syntax int xml_parser_set_option (int parser, int option, mixed value) Description The xml_parser_set_option() function, which was added in PHP 3.0.6 and PHP 4.0, sets an option for the specified parser . The possible option values are XML_OPTION_CASE_FOLDING , which is an integer used to turn case-folding on and off (on by default), and XML_OPTION_TARGET_ENCODING , a string used set the target encoding type. Encoding types include ISO-8859-1 , US-ASCII , and UTF-8 . xml_parser_get_option() Syntax mixed xml_parser_get_option (int parser , int option ) The xml_parser_get_option() function, which was added in PHP 3.0.6 and PHP 4.0, returns the value of the specified option . See xml_parser_set_option() for the possible values. utf8_decode() Syntax string utf8_decode (string data) Description The utf8_decode() function, which was added in PHP 3.0.6 and PHP 4.0, decodes a character string with UTF-8 encoding to single-byte ISO-8859-1 encoding. utf8_encode() PHP Developer’s Dictionary IT-SC book 342 Syntax string utf8_encode (string data) Description The utf8_encode() function, which was added in PHP 3.0.6 and PHP 4.0, encodes a character string with ISO-8859-1 encoding to UTF-8 encoding. PHP Developer’s Dictionary IT-SC book 343 Chapter 9. System Extensions This chapter describes the PHP functions that interact with the operating system. These functions return information about users, directories, files, and processes. They provide information about the system and allow access to files and directories. This chapter also contains specific information about how to interact with NIS and retrieve information from POSIX system calls. There are also functions that enable you to manage shared memory, semaphores, and execute external scripts or programs and return the information to PHP. Directory This section describes the functions that are used to open, read, change, rewind, and close directories. Remember that permissions are important when using these functions. If the user that is running the PHP script does not have permissions to perform the operation, the function will return an error. chdir() Syntax int chdir(string directory); Description The chdir() function changes the current working directory to directory . This function returns true, 1 , if the function is successful; false, 0 , is returned if there is a problem changing directories. dir() Syntax new dir(string directory); Description The dir() function uses object-oriented methodology for creating a directory object defined by directory . This function returns two properties: handle and path . The handle property can be used with other directory functions, such as readdir() and closedir() . It behaves exactly as if the directory were opened using the opendir() function. The path property is set to the directory that was opened. This should PHP Developer’s Dictionary IT-SC book 344 always be the same as the string directory that was used to call the function. There are three methods— read , rewind , and close —available with this function. They operate the same as readdir() , rewinddir() , and closedir() . closedir() Syntax void closedir(int dir_handle); Description The closedir() function closes the directory defined by dir_handle . The stream must have previously been opened by opendir() or dir() . opendir() Syntax int opendir(string path ); Description The opendir() function opens the directory defined by path and returns a directory handle. This directory handle is used when calling closedir() , readdir() , and rewinddir() . readdir() Syntax string readdir(int dir_handle); Description The readdir() function returns the name of the next file from the directory defined by dir_handle . The filenames returned are not ordered or sorted in any particular way. rewinddir() . which was added in PHP 3.0.6 and PHP 4.0, returns the byte index that the parser is currently processing. xml_parser_free() Syntax string xml_parser_free (int parser) PHP Developer’s. utf8_decode() function, which was added in PHP 3.0.6 and PHP 4.0, decodes a character string with UTF-8 encoding to single-byte ISO-8859-1 encoding. utf8_encode() PHP Developer’s Dictionary IT-SC. The utf8_encode() function, which was added in PHP 3.0.6 and PHP 4.0, encodes a character string with ISO-8859-1 encoding to UTF-8 encoding. PHP Developer’s Dictionary IT-SC book 343 Chapter