PHP Generators Reading a large file with a generator
Example
One common use case for generators is reading a file from disk and iterating over its contents. Below is a class that allows you to iterate over a CSV file. The memory usage for this script is very predictable, and will not fluctuate depending on the size of the CSV file.
<?php
class CsvReader
{
protected $file;
public function __construct($filePath) {
$this->file = fopen($filePath, 'r');
}
public function rows()
{
while (!feof($this->file)) {
$row = fgetcsv($this->file, 4096);
yield $row;
}
return;
}
}
$csv = new CsvReader('/path/to/huge/csv/file.csv');
foreach ($csv->rows() as $row) {
// Do something with the CSV row.
}
