使用php和mysql创建csv文件时是否有文件大小限制？

Question

我正在尝试创建一个csv文件来更新我在Magento中的库存。我的代码如下：

<?php 
require_once ('../db.php'); 

$conn = db_connect(); 
$inventory = array(); 
$csvContent = ""; 
$n=0; 


$result = $conn->query("select inventory.sku, book.author, book.title, 
book.publisher,  book.pub_date, book.edition, 
inventory.isbn13, book.binding, book_condition.book_condition, defect.defect, note,  
feature, inventory.ourPrice, inventory.cost, inventory.quantity, subtitle, weight 
from inventory 
LEFT JOIN book on book.isbn13 = inventory.isbn13 
LEFT JOIN defect on inventory.defect_id = defect.defect_id 
LEFT JOIN note on inventory.note_id = note.note_id 
LEFT JOIN feature on inventory.feature_id = feature.feature_id 
LEFT JOIN book_condition on book_condition.condition_id = defect.condition_id 
where inventory.quantity >0"); 

$num_rows = $result->num_rows; 

if($num_rows > 0) 
{ 
while($row = $result->fetch_assoc()) 
{ 
$inventory[$n] = array('sku' => $row['sku'], 
     'author' => $row['author'], 
        /*'title' => $row['title'], 
        'publisher' => $row['publisher'], 
        'pub_date' => $row['pub_date'], 
        'edition' => $row['edition'], 
        'publisher' => $row['publisher'], 
        //'isbn10' => $isbn10, 
        'isbn13' => $row['isbn13'], 
        'binding' => $row['binding'], 
        'condition' => $row['condition'], 
        'defects' => $row['defect'], 
        'notes' => $row['note'], 
        'feature' => $row['feature'], 
        'price' => number_format($row['ourPrice'], 2, '.', ''), 
     'cost' => $row['cost'], 
        'description' => $row['defect'], 
        'quantity' => $row['quantity'], 
     'store' => "default", 
     'websites' => "base", 
     'attribute_set' => "books", 
     'type' => "simple", 
     'category' => "6", 
     'type' => "simple", 
     'image' => "/bcpics/".$row['isbn13'].".gif", 
     'small_image' => "/bcpics/".$row['isbn13'].".gif", 
     'thumbnail' => "/bcpics/".$row['isbn13'].".gif", 
     'page_layout' => "No Layout updates", 
     'options_container' => "Block after Info Column", 
     'weight' => $row['weight'], 
      'status' =>"Enables", 
     'tax_class_id' =>"Taxable Goods", 
     'visibility' =>"Catalog, Search", 
     'enable_googlecheckout' =>"yes", 
     'is_recurring' =>"no", 
     'min_qty' =>"0",*/ 
     'use_config_min_qty' =>"1", 
     'is_qty_decimal' =>"0", 
     'backorders' =>"0", 
     'use_config_backorders' =>"1", 
     'min_sale_qty' =>"1", 
     'use_config_min_sale_qty' =>"1", 
     'max_sale_qty' =>"0", 
     'use_config_max_sale_qty' =>"1", 
     'is_in_stock' =>"1", 
     'use_config_notify_stock_qty' =>"1", 
     'manage_stock' =>"0", 
     'use_config_manage_stock' =>"1", 
     'stock_status_changed_automatically' =>"0", 
     'use_config_qty_increments' =>"1", 
     'qty_increments' =>"0", 
     'use_config_enable_qty_increments' =>"1", 
     'enable_qty_increments' =>"0", 
     'store_id' =>"1", 
     'product_type_id' =>"simple", 
     'add_delete' => "", 
     'url_key' => "", 
     'gift_message_available' => "", 
     'Topic' => "", 
     'Subtitle'=> $row['subtitle'], 
     'meta_title' => "", 
     'meta_description' => "", 
     'custom_design' => "", 
     'url_path' => "", 
     'special_price' => "", 
     'meta_keyword' => "", 
     'custom_layout_update' => "", 
     'news_from_date' => "", 
     'news_to_date' => "", 
     'special_from_date' => "", 
     'special_to_date' => "", 
     'custom_design_from' => "", 
     'custom_design_to' => "", 
     'low_stock_date' => "", 
     'notify_stock_qty' => "", 
     'product_status_changed' => "", 
     'product_changed_websites'=> "", 
     'has_options'=> "0" 

      ); 
    //print_r($inventory);die; 
    $n++; 
    } //end of while loop 
} // end of if statement 

$csvInventory = to_csv($inventory); 

function to_csv($array) { 
$csv = ""; 

if (count($array) == 0) return "No SKU's found"; 

## Grab the first element to build the header 
$arr = array_pop($array); 
$temp = array(); 
foreach($arr as $key => $data) { 
    $temp[] = $key; 
} 
$csv = implode(',', $temp) . "\r\n"; 

## Add the data from the first element 
$csv .= to_csv_line($arr); 

## Add the data for the rest 
foreach($array as $arr) { 
    $csv .= to_csv_line($arr); 
} 

return $csv; 
} 

function to_csv_line($array) { 
$temp = array(); 
foreach($array as $elt) { 
    $temp[] = '"' . addslashes($elt) . '"'; 
} 

$string = implode(',', $temp) . "\r\n"; 

return $string; 
} 

$conn->close(); 

$myFile = "/home/bookcell/public_html/testbcos/web/inv/BCWebsite" . date("mdY") . ".csv"; 
$fh = fopen($myFile, 'w') or die("can't open file"); 
$stringData = $csvInventory; 
fwrite($fh, $stringData); 
fclose($fh); 

我的问题是，我不能让它的工作，如果我尝试使用在$inventory[$n] = array()所有参数。我可以在阵列中除了大约30行以外的所有行一起工作，目前在/*和*/中的所有内容都不起作用。我已经改变了/*和*/之间的字段，所以我知道每行都会进入csv而没有问题。我检查了服务器上的错误日志，没有错误，传输日志显示它应该正常工作。 有人在这里看到我要去的地方吗？有没有更好的方法来达到我需要的结果？

Answer 1

我已经以类似的方式从PHP和MySQL导出了600MB +大小的csv文件，您没有问题。听起来像是你的环境设置的问题 - 而不是代码或技术的限制。