How Can I Read Large Files Line by Line in PHP Without Running Out of Memory?

Reading Large Files Line by Line Without Memory Constraints

Loading an entire file into memory can be a performance bottleneck, especially when dealing with massive files. To overcome this challenge while preserving line-by-line access, consider employing the fgets() function.

fgets() operates by fetching a single line from a file pointer and storing it in a specified buffer. Its implementation consumes a minimal amount of memory since it reads only the current line, not the entire file.

Here's an example that demonstrates how to use fgets() to read a large file line by line:

<?php
$handle = fopen("inputfile.txt", "r");

if ($handle) {
    while (($line = fgets($handle)) !== false) {
        // Process the current line here.
    }

    fclose($handle);
}
?>

This script efficiently iterates through the file, line by line, without exceeding memory limitations, even for files as large as 1 GB.

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