What potential pitfalls should be considered when using fopen(), fseek(), and fread() to manipulate large files in PHP?

When manipulating large files in PHP using fopen(), fseek(), and fread(), potential pitfalls to consider include memory usage and performance issues. Reading large files into memory can consume a lot of resources, leading to memory exhaustion or slow processing times. To mitigate this, it is recommended to read the file in chunks rather than all at once. 

$filename = 'large_file.txt';
$chunkSize = 4096; // Adjust the chunk size as needed

$handle = fopen($filename, 'r');
if ($handle) {
    while (!feof($handle)) {
        $chunk = fread($handle, $chunkSize);
        // Process the chunk as needed
    }
    fclose($handle);
}

Keywords

fopen fseek fread large files PHP

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