<?php
// Micro-benchmark of the float->string paths
const N = 4000;
const R = 8;

$vals = [];
for ($i = 1; $i <= N; $i++) {
    $vals[] = M_PI * $i / 7.0 + 1.0 / $i;
}

function bench(string $name, callable $fn, array $vals): void {
    $fn($vals); $fn($vals);
    $best = PHP_INT_MAX;
    for ($r = 0; $r < R; $r++) {
        $t = hrtime(true);
        $sink = $fn($vals);
        $dt = hrtime(true) - $t;
        if ($dt < $best) $best = $dt;
    }
    $ops = count($vals);
    printf("%-26s %8.1f ns/op   (min block %6.2f ms)\n", $name, $best / $ops, $best / 1e6);
}

bench('(string) cast', function($vals){ $s=0; foreach($vals as $v){ $x=(string)$v; $s+=strlen($x); } return $s; }, $vals);
bench('string interpolation', function($vals){ $s=0; foreach($vals as $v){ $x="$v"; $s+=strlen($x); } return $s; }, $vals);
bench('concatenation', function($vals){ $s=''; foreach($vals as $v){ $s = $v . '|'; } return strlen($s); }, $vals);
bench('number_format', function($vals){ $s=0; foreach($vals as $v){ $s+=strlen(number_format($v, 6, '.', ',')); } return $s; }, $vals);
bench("sprintf('%g')", function($vals){ $s=0; foreach($vals as $v){ $s+=strlen(sprintf('%g',$v)); } return $s; }, $vals);
bench("sprintf('%.10f')", function($vals){ $s=0; foreach($vals as $v){ $s+=strlen(sprintf('%.10f',$v)); } return $s; }, $vals);
bench('json_encode (array)', function($vals){ return strlen(json_encode($vals)); }, $vals);
bench('serialize (array)', function($vals){ return strlen(serialize($vals)); }, $vals);
bench('var_export (array)', function($vals){ return strlen(var_export($vals, true)); }, $vals);
bench('implode floats', function($vals){ return strlen(implode(',', $vals)); }, $vals);