concat string comparison

concat-performance-comparison

<?php
$iterations = 10**7;

$part1 = 'some_part1_string';
$part2 = 'some_part2_string';
$part3 = 'some_part3_string';
$part4 = 'some_part4_string';

function singleQuotesConcat(string $p1, string $p2, string $p3, string $p4): string {
    return $p1 . '-' . $p2 . '-' . $p3 . '-' . $p4;
}

function doubleQuotesConcat(string $p1, string $p2, string $p3, string $p4): string {
    return  "{$p1}-{$p2}-{$p3}-{$p4}";
}

function sprintfConcat(string $p1, string $p2, string $p3, string $p4): string {
    return sprintf('%s-%s-%s-%s', ...func_get_args());
}

function implodeConcat(string $p1, string $p2, string $p3, string $p4): string {
    return implode('-', func_get_args());
}

$testFunctions = [
    'singleQuotesConcat',
    'doubleQuotesConcat',
    'sprintfConcat',
    'implodeConcat',
];

foreach ($testFunctions as $functionName) {
    $results = [];
    for($i = 0; $i < $iterations; ++$i) {
        $start = microtime(true);
        $memoryPeakOnStart = memory_get_peak_usage(true);
        $res = $functionName($part1, $part2, $part3, $part4);
        $time = microtime(true) - $start;
        $memoryPeakIncrease = memory_get_peak_usage(true) - $memoryPeakOnStart;
        $results['times'][] = $time;
        $results['memoryPeak'][] = $memoryPeakIncrease;
    }
    echo sprintf(
        "Method '%s'\n\tavgTime: %f\n\tavgMemoryPeak: %d\n",
        $functionName,
        array_sum($results['times']) / count($results['times']),
        array_sum($results['memoryPeak']) / count($results['memoryPeak'])
    );
}

PHP 7.2.22-1+ubuntu18.04.1+deb.sury.org+1 (cli) (built: Sep  2 2019 12:54:33) ( NTS )
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    with Xdebug v2.7.2, Copyright (c) 2002-2019, by Derick Rethans

result

Method 'singleQuotesConcat'
	avgTime: 0.000003
	avgMemoryPeak: 0
Method 'doubleQuotesConcat'
	avgTime: 0.000003
	avgMemoryPeak: 0
Method 'sprintfConcat'
	avgTime: 0.000003
	avgMemoryPeak: 0
Method 'implodeConcat'
	avgTime: 0.000003
	avgMemoryPeak: 0