如何在 PHP 中从 csv 文件中提取数据

Question

我有一个 csv 文件，看起来像这样

$lines[0] = "text, with commas", "another text", 123, "text",5;
$lines[1] = "some without commas", "another text", 123, "text";
$lines[2] = "some text with commas or no",, 123, "text";

我想要一张桌子：

$t[0] = array("text, with commas", "another text", "123", "text","5");
$t[1] = array("some without commas", "another text", "123", "text");
$t[2] = array("some text, with comma,s or no", NULL , "123", "text");

如果我使用split($lines[0],",")，我会得到"text" ,"with commas" ... 有什么优雅的方法吗？

Answer 1

您可以使用fgetcsv 解析CSV 文件，而不必担心自己解析它。

PHP 手册中的示例：

$row = 1;
if (($handle = fopen("test.csv", "r")) !== FALSE) {
    while (($data = fgetcsv($handle, 1000, ",")) !== FALSE) {
        $num = count($data);
        echo "<p> $num fields in line $row: <br /></p>\n";
        $row++;
        for ($c=0; $c < $num; $c++) {
            echo $data[$c] . "<br />\n";
        }
    }
    fclose($handle);
}

Answer 2

除了Matt's suggestion，还可以使用SplFileObject读入文件：

$file = new SplFileObject("data.csv");
$file->setFlags(SplFileObject::READ_CSV);
$file->setCsvControl(',', '"', '\\'); // this is the default anyway though
foreach ($file as $row) {
    list ($fruit, $quantity) = $row;
    // Do something with values
}

^{来源：http://de.php.net/manual/en/splfileobject.setcsvcontrol.php}

Answer 3

这里也是获取读取csv文件的简单方法。

$sfp = fopen('/path/to/source.csv','r'); $dfp = fopen('/path/to/destination.csv','w'); 而 ($row = fgetcsv($sfp,10000,",","")) { $goodstuff = ""; $goodstuff = str_replace("¦",",",$row[2]); $goodstuff .= "\n"; fwrite($dfp,$goodstuff); } fclose($sfp); fclose($dfp);

Answer 4

您可以使用以下函数读取数据。

  function readCSV() {
    $csv = array_map('str_getcsv', file('data.csv'));
    array_shift($csv); //remove headers


}

http://www.pearlbells.co.uk/how-to-sort-a1a2-z9z10aa1aa2-az9az10-using-php/

Answer 5

也许我的代码可以解决你的问题：

// Parse all content from csv file and generate array from line.
function csv_content_parser($content) {
  foreach (explode("\n", $content) as $line) {
    // Generator saves state and can be resumed when the next value is required.
    yield str_getcsv($line);
  }
}
// Get content from csv file.
$content = file_get_contents('your_file.csv');
// Create one array from csv file's lines.
$data = array();
foreach (csv_content_parser($content) as $fields) {
  array_push($data, $fields);
}

结果你有一个包含来自 csv 的所有值的数组。 它会是这样的：

Array
(
    [0] => Array
        (
            [0] => text, with commas
            [1] => another text
            [2] => 123
            [3] => text
            [4] => 5
        )

    [1] => Array
        (
            [0] => some without commas
            [1] => another text
            [2] => 123
            [3] => text
        )

    [2] => Array
        (
            [0] => some text, with comma,s or no
            [1] =>  NULL 
            [2] => 123
            [3] => text
        )

)

Answer 6

假设你有一个创建相同事物的函数，那么它应该看起来像

function csvtoarray($filename='', $delimiter){

    if(!file_exists($filename) || !is_readable($filename)) return FALSE;
    $header = NULL;
    $data = array();

    if (($handle = fopen($filename, 'r')) !== FALSE ) {
        while (($row = fgetcsv($handle, 1000, $delimiter)) !== FALSE)
        {   
            if(!$header){
                $header = $row;
            }else{
                $data[] = array_combine($header, $row);
            }
        }
        fclose($handle);
    }
    if(file_exists($filename)) @unlink($filename);

    return $data;
}

$data = csvtoarray('file.csv', ',');

print_r($data);

Answer 7

您可以使用类似https://github.com/htmlburger/carbon-csv 的东西来允许列映射：

$csv = new \Carbon_CSV\CsvFile('path-to-file/filename.csv');
$csv->set_column_names([
    0 => 'first_name',
    1 => 'last_name',
    2 => 'company_name',
    3 => 'address',
]);
foreach ($csv as $row) {
    print_r($row);
}

下面代码的结果是这样的：

Array
(
    [0] => Array
        (
            [first_name] => John
            [last_name] => Doe
            [company_name] => Simple Company Name
            [address] => Street Name, 1234, City Name, Country Name
        )
    [1] => Array
        (
            [first_name] => Jane
            [last_name] => Doe
            [company_name] => Nice Company Name
            [address] => Street Name, 5678, City Name, Country Name
        )
)

另一个做同样事情（甚至更多）的库是http://csv.thephpleague.com/9.0/reader/

Answer 8

当你想为多维结果数组保留索引（第一行）时，你可以使用：

$delim      = ';';
$csvFile    = file($csv_file);
$firstline  = str_getcsv($csvFile[0], $delim);
$data       = array();
foreach ($csvFile as $line) {
    $line   = str_getcsv($line, $delim);
    $data[] = array_combine($firstline, $line);
}

Answer 9

我已经构建了一个从 CSV 文件中提取数据的应用程序，这个 php 应用程序用于为用户显示每日报价。

github上的完整项目：365-quotes-php-csv.

这也是我构建的应用程序的类代码

  <?php
/*
Main Class 
please note :
1- the CSV file must be comma separated (,) and each line must End with (;).
2- Feel free to edit the all.CSV file and add all of your 366 New Quotes.
3- don't change any thing specially the CSV file Location.
---------------------------------------------------------------------------
RISS.WORK all copy rights reserved 2018
please Don't Remove
Github/RissWork
Email : info@riss.work
*/
class Quote{

    //properties
        private $_quote,$_allQuotes;
        private static $_instance = null;

    //Constructor
        private function __construct(){
            //Day Count
            $dayCount = date(z);

            if($this->readCsvAndGetQuote($dayCount)){
                return $this->getQuote();
            }else{
                echo 'Error Cannot open the .CSV File';
            }
        }





    //Methods

    //get Instance
    public function getInstance(){
            if(!isset(self::$_instance)){
                self::$_instance = new Quote();
            }
            return self::$_instance;
        }//end of get Instance




    //get daily Quote   
    public function getQuote(){
            return $this->_quote;
        }//end of get Quote




    //Read CSV
    private function readCsvAndGetQuote($dayCount = 1 ){

        if(($handel = fopen("csv/all.csv" , "r")) !== false){
            $this->_allQuotes = fgetcsv($handel,1000000,';');
            $this->_quote = explode(',',$this->_allQuotes[$dayCount]);
            return true;
        }
        return false;

    }//end of read CSV



}//end of Class

Answer 10

返回一个带有兴趣列的 php 映射数组：

public function extractCSVDatas($file_uri) {
    $AliasToSystemPathMappingArray = [];
    if (($handle = fopen($file_uri, "r")) !== FALSE) {
      $csv = array_map('str_getcsv', file($file_uri));

      //remove header and choose columns among the list:
      foreach((array_slice($csv,1)) as $line) {
        list($id, $alias, $systemPath) = explode(';',$line[0]);
        $AliasToSystemPathMappingArray[] = [$alias, $systemPath];
      }
      fclose($handle);
    }
    return $AliasToSystemPathMappingArray;
  }

Answer 11

/**
 * @return mixed[]
 */
public function csvToArray(string $delimiter, string $filename = ''): array
{
    $data = [];
    if (file_exists($filename) && is_readable($filename)) {
        $header = null;

        if (($handle = fopen($filename, 'r')) !== false) {
            while (($row = fgetcsv($handle, 1000, $delimiter)) !== false) {
                if (!$header) {
                    $header = $row;
                } else {
                    $data[] = array_combine($header, $row);
                }
            }
            fclose($handle);
        }
    }

    return $data;
}

Answer 12

既然可以复杂，为什么一定要简单？

别开玩笑了，这里有一个使用 PHP 函数 str_getcsv() 的快速简单的解决方案

这是一个例子：

function parse_csv( $filename_or_text, $delimiter=',', $enclosure='"', $linebreak="\n" )
{
    $return = array();
    
    if(false !== ($csv = (filter_var($filename_or_text, FILTER_VALIDATE_URL) ? file_get_contents($filename_or_text) : $filename_or_text)))
    {
        $csv = trim($csv);
        $csv = mb_convert_encoding($csv, 'UTF-16LE');   
        
        foreach(str_getcsv($csv, $linebreak, $enclosure) as $row){
            $col = str_getcsv($row, $delimiter, $enclosure);
            $col = array_map('trim', $col);
            $return[] = $col;
        }
    }
    else
    {
        throw new \Exception('Can not open the file.');
        $return = false;
    }
    
    return $return;
}

想象一下，您需要一个同时处理 URL 和逗号分隔文本的函数。这正是这样工作的功能。只需插入一个 CSV URL 或逗号分隔的文本，它就可以很好地工作。

Answer 13

刚刚创建了一个函数，它从 .csv 文件或 csv 格式的文本中提取数据，然后对其进行解析以便更方便地使用（假设第一行是列）。无论您想要/拥有多少行/列，只需简单地将函数指向文件位置/字符串，它就会返回结果！

function csvParse($input, $callback = false){
    $results = [];
    $raw_array = (is_file($input)) ? array_map('str_getcsv', file($input)) : array_map('str_getcsv', explode("\n", $input));
    $array = array_splice($raw_array, 1, count($raw_array));
    foreach($raw_array[0] as $c) $columns[] = $c;
    foreach($array as $key0 => $val0) 
        foreach($val0 as $key1 => $val1) 
            $results[$key0][$columns[$key1]] = $val1;
    if(is_callable($callback)) call_user_func_array($callback, array($results));
    else return $results;
}

# Either One Would Work
$input = "dir/file.csv";
$input = "name,age,occupation,city\nCrimin4L,24,Programmer,New York\nMrAwesome,20,Gamer,Los Angeles";

# Usage #1
$array = csvParse($input);
var_export($array);

# Usage #2
csvParse($input, function($array){
    var_export($array);
});

输入：

name,age,occupation,city
Crimin4L,24,Programmer,New York
MrAwesome,20,Gamer,Los Angeles

数组输出：

array (
  0 => 
  array (
    'name' => 'Crimin4L',
    'age' => '24',
    'occupation' => 'programmer',
    'city' => 'New York',
  ),
  1 => 
  array (
    'name' => 'MrAwesome',
    'age' => '20',
    'occupation' => 'gamer',
    'city' => 'Los Angeles',
  ),
)

现场演示：https://ideone.com/Sa1aMO