Question

我正在使用PHP使用array_shift删除大约40000个CSV的第一行我遇到了以下错误：

Allowed memory size of 134217728 bytes exhausted (tried to allocate 32 bytes) in /Applications/MAMP/htdocs/SeeClickFix/Finished_before_shift/shift.php on line 10

脚本如下所示：

<?php
// Read the file
for ($x = 0; $x <= 40000; $x++) {

    $file = fopen('export'.$x.'.csv', 'r');

    // Iterate over it to get every line 
    while (($line = fgetcsv($file)) !== FALSE) {
        // Store every line in an array
        $data[] = $line;
    }
    fclose($file);

    // Remove the first element from the stored array / first line of file being read
    array_shift($data);

    // Open file for writing
    $file = fopen('export'.$x.'.csv', 'w');

    // Write remaining lines to file
    foreach ($data as $fields) {
        fputcsv($file, $fields);
    }
    fclose($file);

    echo $x;
}
?>

这里的任何帮助都会非常感激，因为我从未见过这样的事情。

谢谢！

Answer 1

在读取每个文件之前，您需要清空$data数组。否则，它会累积所有文件中的行。

<?php
// Read the file
for ($x = 0; $x <= 40000; $x++) {

    $file = fopen('export'.$x.'.csv', 'r');
    $data = array();

    // Iterate over it to get every line 
    while (($line = fgetcsv($file)) !== FALSE) {
        // Store every line in an array
        $data[] = $line;
    }
    fclose($file);

    // Remove the first element from the stored array / first line of file being read
    array_shift($data);

    // Open file for writing
    $file = fopen('export'.$x.'.csv', 'w');

    // Write remaining lines to file
    foreach ($data as $fields) {
        fputcsv($file, $fields);
    }
    fclose($file);

    echo $x;
}
?>

但是如果您只想从每个文件中删除第一行，则无需将其解析为CSV。你可以这样做：

<?php
for ($x = 0; $x <= 40000; $x++) {
    $file = fopen('export'.$x.'.csv', 'r');
    fgets($file); // Read first line
    $lines = stream_get_contents($file); // Read remaining lines
    fclose($file);

    file_put_contents('export'.$x.'.csv', $lines);
    echo $x;
}
?>

PHP脚本在40000文件上运行时出现内存耗尽错误

1 个答案: