這篇文章主要介紹了php將文本文件轉(zhuǎn)換csv輸出的方法,通過(guò)對(duì)SplFileObject類的繼承與擴(kuò)展實(shí)現(xiàn)文本文件轉(zhuǎn)換輸出的功能,是非常實(shí)用的技巧,需要的朋友可以參考下

本文實(shí)例講述了php將文本文件轉(zhuǎn)換csv輸出的方法。分享給大家供大家參考。具體實(shí)現(xiàn)方法如下：

這個(gè)類提供了轉(zhuǎn)換成固定寬度的CSV文件,快速,簡(jiǎn)便的方法,它可將SplFileObject用于執(zhí)行迭代,使它非常高效的一個(gè)迭代只知道當(dāng)前成員,期權(quán)是提供給指定行字符和字段分隔符結(jié)束,This from CSV files.這個(gè)類是特別有用的,如果數(shù)據(jù)需要來(lái)自一個(gè)固定寬度的文件,并插入到數(shù)據(jù)庫(kù)中,因?yàn)榇蠖鄶?shù)的數(shù)據(jù)庫(kù)支持從CSV文件中的數(shù)據(jù)輸入.

這一類的方便的功能是可以跳過(guò)字段如果不是在輸出需要,該領(lǐng)域的陣列提供,提供了一個(gè)鍵/值對(duì),與主要持有的價(jià)值偏移,或啟動(dòng)領(lǐng)域的地位,和值包含的寬度,或字段的長(zhǎng)度,For example.例如,12 =“10是一個(gè)領(lǐng)域,在12位和寬度或字段的長(zhǎng)度為10個(gè)字符開(kāi)始.

底的行字符默認(rèn)成“ n”，而是可以設(shè)置為任何字符。

分隔符默認(rèn)為一個(gè)逗號(hào),但可以設(shè)置為任何字符，或字符。

從文件的輸出可以直接使用,寫(xiě)入一個(gè)文件,到數(shù)據(jù)庫(kù)或任何其他目的插入.

PHP實(shí)例代碼如下:

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

* @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

代碼如下:

<?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 ();

}

?>

希望本文所述對(duì)大家的php程序設(shè)計(jì)有所幫助。

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