php将文本文件转换csv输出的方法
《PHP实例:php将文本文件转换csv输出的方法》要点: 本篇章节讲解php将文本文件转换csv输出的办法.分享给大家供大家参考.具体实现办法如下:PHP实例 这个类提供了转换成固定宽度的CSV文件,快速,简便的办法,它可将SplFileObject用于执行迭代,使它非常高效的一个迭代只知道当前成员,期权是提供给指定行字符和字段分隔符结束,This from CSV files.这个类是特别有用的,如果数据需要来自一个固定宽度的文件,并插入到数据库中,因为大多数的数据库支持从CSV文件中的数据输入.PHP实例 这一类的方便的功能是可以跳过字段如果不是在输出需要,该领域的阵列提供,提供了一个键/值对,与主要持有的价值偏移,或启动领域的地位,和值包含的宽度,或字段的长度,For example.例如,12 =“10是一个领域,在12位和宽度或字段的长度为10个字符开始.PHP实例 底的行字符默认成“ n”,而是可以设置为任何字符.PHP实例 分隔符默认为一个逗号,但可以设置为任何字符,或字符.PHP实例 从文件的输出可以直接使用,写入一个文件,到数据库或任何其他目的插入.PHP实例 PHP实例代码如下:
代码如下:
<?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
代码如下:
<?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 ); /*** output only the first and third fields ***/? foreach( $new as $line )? {? echo $line ;? } ? }? catch( Exception $e )? {? echo $e -> getMessage ();? } ?> 希望本文所述对大家的php程序设计有所赞助.PHP实例 《PHP实例:php将文本文件转换csv输出的方法》是否对您有启发,欢迎查看更多与《PHP实例:php将文本文件转换csv输出的方法》相关教程,学精学透。编程之家 52php.cn为您提供精彩教程。 (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |