please recommend for more than 15 lakh data reading in php

For reading more than 15 lakh (1.5 million) records efficiently in PHP, you need to optimize memory usage and speed. Here’s a comprehensive recommendation:

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Recommended Approach: Use JSON or CSV with Streaming

If you’re dealing with data files (like .json, .csv, or .txt), use a streaming parser instead of loading the entire file into memory.

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1. Best File Format: CSV (Highly Recommended)

Why CSV?

• Compact file size
• Faster to parse than JSON
• Supported natively in PHP
• Easy to stream line-by-line

PHP Code to Read Large CSV Efficiently:

$handle = fopen("large-data.csv", "r");
if ($handle) {
    while (($row = fgetcsv($handle)) !== false) {
        // Process each $row
    }
    fclose($handle);
} else {
    echo "File not found!";
}

This reads line-by-line, so memory usage stays low.

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2. If JSON is a Must: Use Streaming JSON Parser

❌ Do NOT use json_decode(file_get_contents(...)) for large files — it loads entire file in memory.

Use JsonMachine

Install via Composer:

bashCopyEditcomposer require halaxa/json-machine

PHP Code Example:

phpCopyEdituse JsonMachine\JsonMachine;

require 'vendor/autoload.php';

$jsonStream = JsonMachine::fromFile('large-data.json');

foreach ($jsonStream as $key => $value) {
    // Process $value
}

This reads JSON incrementally — perfect for 15+ lakh records.

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3. Consider Using a Database Instead

If you’re reading this much data repeatedly or filtering/searching it:

✅ Import it into MySQL/PostgreSQL
✅ Use LIMIT + OFFSET or cursor-based pagination
✅ Use mysqli or PDO with fetch modes like fetch() or fetchAll() depending on memory.

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Summary Table

Format	Speed	Memory Usage	Ease of Use	Recommended
CSV	✅✅✅	✅✅✅	✅✅✅	⭐⭐⭐⭐⭐
JSON	✅	✅✅ (if streaming)	✅	⭐⭐⭐
Database	✅✅✅	✅✅✅	✅✅	⭐⭐⭐⭐⭐

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Bonus Tips:

• Always monitor memory: memory_get_usage()
• For extreme cases, use generators (yield)
• Use ini_set('memory_limit', '512M') if needed (careful!)