PHP - Is array_map faster than foreach? [duplicate]

Question

In terms of performance, which is the better option?

While in object:

Case #1

public function test( $array ) {
    return array_map( array( $this, 'do_something_to_element' ), $array );
}

Case #2

public function test( $array ) {
    $return = array();
    foreach ( $array as $value ) {
        $return[] = do_something_to_element( $value );
    }
    return $return;
}

There are other uses of course and many many examples can be populated. I've seen comments that while in an object, array_map is slower than foreach loops.

In general is the array_map/array_walk functions faster to execute than the foreach loops in similar needs?

Why don't you benchmark it? It may theoretically also vary dramatically between different PHP versions, so it's hardly a constructive question. Few performance questions are. — deceze
– deceze ♦, Commented Aug 25, 2014 at 8:20
Given that you're not using the keys of the array, why not compare these two approaches to a simple for loop, too? for loops tend to outperform foreach, and seeing as loops are constructs, and not function calls, I'd expect them to outperform array_map — Elias Van Ootegem
– Elias Van Ootegem, Commented Aug 25, 2014 at 8:22
You can test one of the solution given by PHP code's performance test. Like says deceze, performance can change following your PHP version. — Debflav
– Debflav, Commented Aug 25, 2014 at 8:24

magallanes · Accepted Answer · 2020-06-07 13:22:14Z

9

For the record (php 7.4 + 64bits + windows)

https://github.com/EFTEC/php-benchmarks/blob/master/benchmark_arraymap_foreach.php

foreach = 0.10213899612427
array_map = 0.18259811401367
array_map (static) = 0.18230390548706
array_map (calling a function) = 0.17731499671936

Foreach is still faster but also if we use a static function or not, it doesn't make any difference:

    $result = array_map(function ($number) {
        return $number * 10;
    }, $numbers);

    $result = array_map(static function ($number) {
        return $number * 10;
    }, $numbers);

answered Jun 7, 2020 at 13:22

magallanes

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Comments

ChristoKiwi · Accepted Answer · 2015-12-09 02:43:18Z

6

I tested this on a Symfony project just now, had to Google because it seems so significant. Script went from 160ms using foreach() to 260ms using array_map(). Considering the size of the application thats quite a large increase from a single method call.

answered Dec 9, 2015 at 2:43

ChristoKiwi

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1 Comment

rodrigo-silveira Over a year ago

Can you post the code under test, the actual test, and how you benchmarked this?

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