php將文本文件轉(zhuǎn)換csv輸出的方法

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    這篇文章主要介紹了php將文本文件轉(zhuǎn)換csv輸出的方法,通過對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:
    這個類提供了轉(zhuǎn)換成固定寬度的CSV文件,快速,簡便的方法,它可將SplFileObject用于執(zhí)行迭代,使它非常高效的一個迭代只知道當(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.這個類是特別有用的,如果數(shù)據(jù)需要來自一個固定寬度的文件,并插入到數(shù)據(jù)庫中,因?yàn)榇蠖鄶?shù)的數(shù)據(jù)庫支持從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,提供了一個鍵/值對,與主要持有的價值偏移,或啟動領(lǐng)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(lǐng)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(rèn)成“ n”,而是可以設(shè)置為任何字符。
    分隔符默認(rèn)為一個逗號,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,寫入一個文件,到數(shù)據(jù)庫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 ();
    }
    ?>
    希望本文所述對大家的php程序設(shè)計(jì)有所幫助。