本文实例讲述了php将文本文件转换csv输出的方法。分享给大家供大家参考。具体实现方法如下:
这个类提供了转换成固定宽度的CSV文件,快速,简便的方法,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.
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.
底的行字符默认成“ n”,而是可以设置为任何字符。
分隔符默认为一个逗号,但可以设置为任何字符,或字符。
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实例代码如下:
<?php <br />/** <br />* Class to convert fixed width files into CSV format <br />* Allows to set fields, separator, and end-of-line character <br />* <br />* @author Kevin Waterson <br />* @url http://phpro.org <br />* @version $Id$ <br />* <br />*/ <br />class fixed2CSV extends SplFileObject <br />{ <br />/** <br />* <br />* Constructor, duh, calls the parent constructor <br />* <br />* @access public <br />* @param string The full path to the file to be converted <br />* <br />*/ <br />public function __construct ( $filename ) <br />{ <br />parent :: __construct ( $filename ); <br />} <br /> <br />/* <br />* Settor, is called when trying to assign a value to non-existing property <br />* <br />* @access public <br />* @param string $name The name of the property to set <br />* @param mixed $value The value of the property <br />* @throw Excption if property is not able to be set <br />* <br />*/ <br />public function __set ( $name , $value ) <br />{ <br />switch( $name ) <br />{ <br />case 'eol' : <br />case 'fields' : <br />case 'separator' : <br />$this -> $name = $value ; <br />br<div>本文#来源gaodai.ma#com搞##代!^码7网</div><pre>搞代gaodaima码
eak;
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 $csv ;
}
return false ;
}
} // end of class
?>
Example Usage示例用法
<?php <br />try <br />{ <br />/*** the fixed width file to convert ***/ <br />$file = new fixed2CSV ( 'my_file.txt' ); <br /> <br />/*** The start position=>width of each field ***/ <br />$file -> fields = array( 0 => 10 , 10 => 15 , 25 => 20 , 45 => 25 ); <br /> <br />/*** output the converted lines ***/ <br />foreach( $file as $line ) <br />{ <br />echo $line ; <br />} <br /> <br />/*** a new instance ***/ <br />$new = new fixed2CSV ( 'my_file.txt' ); <br /> <br />/*** get only first and third fields ***/ <br />$new -> fields = array( 0 => 10 , 25 => 20 ); <br />/*** output only the first and third fields ***/ <br />foreach( $new as $line ) <br />{ <br />echo $line ; <br />} <br /> <br />} <br />catch( Exception $e ) <br />{ <br />echo $e -> getMessage (); <br />} <br />?>
希望本文所述对大家的php程序设计有所帮助。