PHP code example of simsoft / data-flow

    
        
<?php
require_once('vendor/autoload.php');

/* Start to develop here. Best regards https://php-download.com/ */

    

simsoft / data-flow example snippets

use Simsoft\DataFlow\DataFlow;

(new DataFlow())
    ->from([1, 2, 3])
    ->transform(function($num) {
        return $num * 2;
    })
    ->load(function($num) {
        echo $num . PHP_EOL;
    })
    ->run();

// Output:
// 2
// 4
// 6

use Simsoft\DataFlow\DataFlow;

(new DataFlow())
    ->from([1, 2, 3, 4, 5, 6, 7, 8, 9, 10])
    ->transform(function($num) {
        return $num * 2;
    })
    ->limit(5)  // output only 5 data.
    ->load(function($num) {
        echo $num . PHP_EOL;
    })
    ->run();

// Output:
// 2
// 4
// 6
// 8
// 10

use Simsoft\DataFlow\DataFlow;

(new DataFlow())
    ->from([1, 2, 3, 4, 5, 6, 7, 8, 9, 10])
    ->filter(function($num) {
        // The call back should return bool.
        // In this case, return even number only.
        return $num % 2 === 0;
    })
    ->load(function($num) {
        echo $num . PHP_EOL;
    })
    ->run();

// Output:
// 2
// 4
// 6
// 8
// 10

(new DataFlow())
    ->from([1, 2, 3, 4, 5, 6, 7, 8, 9, 10])
    ->chunk(3) // set chunk size
    ->load(function(array $chunk, $key) {
        echo $key . '=' . json_encode($chunk, JSON_THROW_ON_ERROR) . PHP_EOL;
    })
    ->run();

// Output:
// 0=[1,2,3]
// 1=[4,5,6]
// 2=[7,8,9]
// 3=[10]

(new DataFlow())
    ->from([
        ['First Name' => 'John', 'Last Name' => 'Doe', 'age' => 20],
        ['First Name' => 'Jane', 'Last Name' => 'Doe', 'age' => 30],
        ['First Name' => 'John', 'Last Name' => 'Smith', 'age' => 50],
        ['First Name' => 'Jane', 'Last Name' => 'Smith', 'age' => 60],
    ])
    ->map([
        // rename the key
        'first_name' => 'First Name',
        'last_name' => 'Last Name',

        // customise data via callback method.
        'full_name' => fn($data) => $data['first_name'] . ' ' . $data['last_name'],
        'senior' => fn($data) => $data['age'] > 30 ? 'Yes' : 'No',
    ])
    ->load(function($data) {
        echo $data['full_name'] . ' is ' . $data['age'] . ' years old. ' . $data['senior'] . PHP_EOL;
    })
    ->run();

// Output:
// John Doe is 20 years old. No
// Jane Doe is 30 years old. Yes
// John Smith is 50 years old. Yes
// Jane Smith is 60 years old. Yes

$flow1 = (new DataFlow())
    ->from([1, 2, 3])
    ->transform(function($num) {
        return $num * 2;
    });

(new DataFlow())
    ->from($flow1) // connect flow1 to flow2.
    ->transform(function($num) {
        return $num * 3;
    })
    ->load(function($num) {
        echo $num . PHP_EOL;
    })
    ->run();

// Output:
// 6
// 12
// 18