Wordpress用户添加一行:

@ini_set('memory_limit', '-1');

or

在cpanel中设置memory_limit为-1

你可以通过执行下面的代码来增加php脚本的内存:

ini_set('memory_limit','-1'); // enabled the full memory available.

并且在脚本中取消分配不需要的变量。

It is unfortunately easy to program in PHP in a way that consumes memory faster than you realise. Copying strings, arrays and objects instead of using references will do it, though PHP 5 is supposed to do this more automatically than in PHP 4. But dealing with your data set in entirety over several steps is also wasteful compared to processing the smallest logical unit at a time. The classic example is working with large resultsets from a database: most programmers fetch the entire resultset into an array and then loop over it one or more times with foreach(). It is much more memory efficient to use a while() loop to fetch and process one row at a time. The same thing applies to processing a file.

如果您的脚本需要分配这么大的内存，那么您可以通过在php文件中添加这一行来增加内存限制

ini_set('memory_limit', '44M');

其中，4400万是你预计消费的数量。

但是，大多数情况下，此错误消息意味着脚本正在做错误的事情，增加内存限制只会导致相同的错误消息，但数字不同。

因此，您必须重写代码，而不是增加内存限制，这样它就不会分配那么多内存。例如，在较小的块中处理大量数据，取消保存大值但不再需要的变量，等等。

ini_set('memory_limit', '-1');

做的事情:

ini_set('memory_limit', '-1');

从来都不是好事。如果你想读取一个很大的文件，最好的做法是一点一点地复制它。尝试以下代码进行最佳实践。

$path = 'path_to_file_.txt';

$file = fopen($path, 'r');
$len = 1024; // 1MB is reasonable for me. You can choose anything though, but do not make it too big
$output = fread( $file, $len );

while (!feof($file)) {
    $output .= fread( $file, $len );
}

fclose($file);

echo 'Output is: ' . $output;