PHP有效地读取csv文件

Question

有几种方法可以用PHP读取CSV文件。我以前用爆炸函数把每行放入一个数组，然后爆炸逗号并用trim删除数据周围的引号。它很凌乱...

在PHP 5中现在有fgetcsv和* str_getcsv * ...我猜这是最好的方式去做它，所以我一起搅了一些代码.. 。

$fp = fopen($csv_file['file_path'], 'r');  
while (($data = fgetcsv($fp, 0, "\r", '"', "\r")) !== FALSE) { 
    $num = count($data); 
    for ($c=0; $c < $num; $c++) { 
     print_r(str_getcsv($data[$c])); 
    } 
} 

它似乎工作，但有没有更安全的方法？例如，让它工作，无论换行符是\ n还是\ r ...

任何输入，你可以给出真棒！

Answer 1

这将CSV转换为嵌套数组。可能对你更容易处理：

<?php 
    /** 
    * 
    */ 
    function csv_entry_to_array(array $row) 
    { 
     $column_count = count($row); 
     $csv_column_values = array(); 

     // Loop through the columns of the current CSV entry and store its value 
     for ($column_index = 0; $column_index < $column_count; $column_index++) 
     { 
      // Store the value of the current CSV entry 
      $csv_column_values[] = $row[$column_index]; 
     } 

     // Return 
     return $csv_column_values;  
    } 

    /** 
    * @param string $input_file_name   Filename of input CSV 
    * @param boolean $include_header_in_output Flag indicating whether the first entry in the CSV is included in the output or not. 
    * @param integer $length      Must be greater than the longest line (in characters) to be found in the CSV file (allowing for trailing line-end characters). 
    *            It became optional in PHP 5. Omitting this parameter (or setting it to 0 in PHP 5.0.4 and later) the maximum line length is 
    *            not limited, which is slightly slower. 
    * @param string $delimeter     Set the field delimiter (one character only). 
    * @param string $enclosure     Set the field enclosure character (one character only). 
    * @param string $escape      Set the escape character (one character only). Defaults as a backslash. 
    * $return array        Nested indexed array representing the CSV. Empty array on error (e.g. input file missing, input file not a CSV). 
    */ 
    function csv_file_to_array($input_file_name, $include_header_in_output = TRUE, $length = 1000, $delimeter = ',', $enclosure = '"', $escape = '\\') 
    { 
     // NOTE: this attempts to properly recognize line endings when reading files from Mac; has small performance penalty 
     ini_set('auto_detect_line_endings', TRUE); 

     $csv_array = array(); 

     // Warnings are supressed, but that's OK since the code handles such warnings 
     if (($handle = @fopen($input_file_name, "r")) !== FALSE) 
     { 
      $row_counter  = 0; 

      // Iterate over the CSV entries 
      while (($row = fgetcsv($handle, $length, $delimeter, $enclosure, $escape)) !== FALSE) 
      {   
       if ($row_counter === 0 && $include_header_in_output === TRUE) 
       { 
        // This is the first row in the CSV and it should be included in the output 
        $csv_array[] = csv_entry_to_array($row);     
       } 
       else if ($row_counter > 0) 
       { 
        // This is a row in the CSV that needs to be stored in the return array 
        $csv_array[] = csv_entry_to_array($row); 
       } 

       $row_counter++; 
      } 

      // Close file handler 
      fclose($handle); 
     } 
     else 
     { 
      // Input file: some error occured 
      return array(); 
     } 

     return $csv_array; 
    } 

Answer 2

有一个线性读取文件的功能：file()，它也适用于两种换行类型。

和最短的方法，在整个CSV文件读的是：

$data = array_map("str_getcsv", file($filename)); 

不知道你的$num = count()约。