這個類提供了轉換成固定寬度的CSV文件,快速,簡便的方法,它可將SplFileObject用于執行迭代,使它非常高效的一個迭代只知道當前成員,期權是提供給指定行字符和字段分隔符結束,This from CSV files.這個類是特別有用的,如果數據需要來自一個固定寬度的文件,并插入到數據庫中,因為大多數的數據庫支持從CSV文件中的數據輸入.
這一類的方便的功能是可以跳過字段如果不是在輸出需要,該領域的陣列提供,提供了一個鍵/值對,與主要持有的價值偏移,或啟動領域的地位,和值包含的寬度,或字段的長度,For example.例如,12 =“10是一個領域,在12位和寬度或字段的長度為10個字符開始.
底的行字符默認成“ n”,而是可以設置為任何字符。
分隔符默認為一個逗號,但可以設置為任何字符,或字符。
.從文件的輸出可以直接使用,寫入一個文件,到數據庫或任何其他目的插入.
PHP實例代碼如下:
- <?php
- /**
- * Class to convert fixed width files into CSV format
- * Allows to set fields, separator, and end-of-line character
- *
- * @author Kevin Waterson
- * @url http://phpro.org
- * @version $Id$
- *
- */
- class fixed2CSV extends SplFileObject
- {
- /**
- *
- * Constructor, duh, calls the parent constructor
- *
- * @access public
- * @param string The full path to the file to be converted
- *
- */
- public function __construct ( $filename )
- {
- parent :: __construct ( $filename );
- }
- /*
- * Settor, is called when trying to assign a value to non-existing property
- *
- * @access public
- * @param string $name The name of the property to set
- * @param mixed $value The value of the property
- * @throw Excption if property is not able to be set
- *
- */
- public function __set ( $name , $value )
- {
- switch( $name )
- {
- case 'eol' :
- case 'fields' :
- case 'separator' :
- $this -> $name = $value ;
- break;
- default:
- throw new Exception ( "Unable to set $name " );
- }
- }
- /**
- *
- * Gettor This is called when trying to access a non-existing property
- *
- * @access public
- * @param string $name The name of the property
- * @throw Exception if proplerty cannot be set
- * @return string
- *
- */
- public function __get ( $name )
- {
- switch( $name )
- {
- case 'eol' :
- return " " ;
- case 'fields' :
- return array();
- case 'separator' :
- return ',' ;
- default:
- throw new Exception ( " $name cannot be set" );
- }
- }
- /**
- *
- * Over ride the parent current method and convert the lines
- *
- * @access public
- * @return string The line as a CSV representation of the fixed width line, false otherwise
- *
- */
- public function current ()
- {
- if( parent :: current () )
- {
- $csv = '' ;
- $fields = new cachingIterator ( new ArrayIterator ( $this -> fields ) );
- foreach( $fields as $f )
- {
- $csv .= trim ( substr ( parent :: current (), $fields -> key (), $fields -> current () ) );
- $csv .= $fields -> hasNext () ? $this -> separator : $this -> eol ;
- }
- return $csv ;
- }
- return false ;
- }
- } // end of class
- ?>
- Example Usage示例用法
- <?php
- try
- {
- /*** the fixed width file to convert ***/
- $file = new fixed2CSV ( 'my_file.txt' );
- /*** The start position=>width of each field ***/
- $file -> fields = array( 0 => 10 , 10 => 15 , 25 => 20 , 45 => 25 );
- /*** output the converted lines ***/
- foreach( $file as $line )
- {
- echo $line ;
- }
- /*** a new instance ***/
- $new = new fixed2CSV ( 'my_file.txt' );
- /*** get only first and third fields ***/
- $new -> fields = array( 0 => 10 , 25 => 20 );
- //開源代碼Vevb.com
- /*** output only the first and third fields ***/
- foreach( $new as $line )
- {
- echo $line ;
- }
- }
- catch( Exception $e )
- {
- echo $e -> getMessage ();
- }
- ?>
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