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Restructure examples: single file per example with 3 iterations
Replace before.php/after.php per-directory structure with a single file per example that accepts an iteration argument (1=naive, 2=optimized, 3=refined). This simulates a real profile→optimize→re-profile workflow. Structure: examples/ ├── 01-string-processing.php ← 3 iterations in match() ├── 02-database-simulation.php ← 3 iterations in match() ├── 03-json-api.php ← 3 iterations in match() ├── run-all.sh ← runs each with iteration 1,2,3 ├── results/ ← unified reports for all examples └── README.md Dashboard now shows the same script_filename with SCI progressively dropping across iterations — much clearer for analysis. Results: 01-string -30%, 02-database -98%, 03-json -16% Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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‎examples/01-string-processing.php‎

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<?php
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declare(strict_types=1);
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/**
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* Example 01 — String Processing: progressive optimization.
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*
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* Simulates building an HTML report from 5,000 records.
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* Run 3 times with increasing iteration number to see SCI drop:
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*
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* php 01-string-processing.php 1 ← naive: .= in loop
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* php 01-string-processing.php 2 ← fix: array + implode
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* php 01-string-processing.php 3 ← refined: sprintf + single-pass stats
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*
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* @author fullo <https://github.com/fullo>
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* @license MIT
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* @version 1.0
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*/
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$iteration = (int) ($argv[1] ?? 1);
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echo "=== String Processing — iteration {$iteration}/3 ===\n";
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// ── Generate 5,000 user records (same seed for all iterations) ──
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mt_srand(42);
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$users = [];
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for ($i = 0; $i < 5000; $i++) {
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$users[] = [
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'id' => $i + 1,
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'name' => 'User ' . str_pad((string) ($i + 1), 4, '0', STR_PAD_LEFT),
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'email' => 'user' . ($i + 1) . '@example.com',
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'score' => mt_rand(0, 10000) / 100,
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'active' => $i % 7 !== 0,
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];
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}
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$header = '<!DOCTYPE html><html><head><title>User Report</title>'
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. '<style>table{border-collapse:collapse}td,th{border:1px solid #ccc;padding:4px 8px}'
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. 'tr:nth-child(even){background:#f9f9f9}.inactive{color:#999}</style></head><body>'
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. '<h1>User Report</h1><p>Generated: ' . date('Y-m-d H:i:s') . '</p>'
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. '<table><thead><tr><th>ID</th><th>Name</th><th>Email</th><th>Score</th><th>Status</th></tr></thead><tbody>';
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$footer = '</tbody></table>';
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match ($iteration) {
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// ── Iteration 1: Naive — string concatenation in a loop ──
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// Each .= copies the entire $html string (O(n²) memory operations).
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1 => (function () use ($users, $header, $footer): string {
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$html = $header;
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foreach ($users as $user) {
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$class = $user['active'] ? '' : ' class="inactive"';
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$status = $user['active'] ? 'Active' : 'Inactive';
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$html .= '<tr' . $class . '>';
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$html .= '<td>' . $user['id'] . '</td>';
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$html .= '<td>' . htmlspecialchars($user['name']) . '</td>';
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$html .= '<td>' . htmlspecialchars($user['email']) . '</td>';
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$html .= '<td>' . number_format($user['score'], 2) . '</td>';
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$html .= '<td>' . $status . '</td>';
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$html .= '</tr>';
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}
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$html .= $footer;
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// Summary: second loop over all users
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$active = 0;
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$total = 0.0;
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foreach ($users as $user) {
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if ($user['active']) {
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$active++;
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}
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$total += $user['score'];
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}
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$html .= '<p>Active: ' . $active . '/' . count($users) . '</p>';
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$html .= '<p>Avg score: ' . number_format($total / count($users), 2) . '</p>';
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$html .= '</body></html>';
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echo 'Output: ' . strlen($html) . " bytes | Active: {$active}\n";
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return $html;
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})(),
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// ── Iteration 2: Fix — array + implode, single allocation ──
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// Each $parts[] = '...' is O(1). implode() does one allocation at the end.
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2 => (function () use ($users, $header, $footer): string {
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$parts = [$header];
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foreach ($users as $user) {
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$class = $user['active'] ? '' : ' class="inactive"';
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$status = $user['active'] ? 'Active' : 'Inactive';
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$parts[] = '<tr' . $class . '>'
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. '<td>' . $user['id'] . '</td>'
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. '<td>' . htmlspecialchars($user['name']) . '</td>'
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. '<td>' . htmlspecialchars($user['email']) . '</td>'
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. '<td>' . number_format($user['score'], 2) . '</td>'
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. '<td>' . $status . '</td>'
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. '</tr>';
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}
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$parts[] = $footer;
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// Summary: still a second loop
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$active = 0;
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$total = 0.0;
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foreach ($users as $user) {
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if ($user['active']) {
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$active++;
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}
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$total += $user['score'];
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}
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$parts[] = '<p>Active: ' . $active . '/' . count($users) . '</p>';
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$parts[] = '<p>Avg score: ' . number_format($total / count($users), 2) . '</p>';
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$parts[] = '</body></html>';
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$html = implode('', $parts);
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echo 'Output: ' . strlen($html) . " bytes | Active: {$active}\n";
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return $html;
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})(),
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// ── Iteration 3: Refined — sprintf rows + single-pass stats ──
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// All stats computed inline during the same loop. No second iteration.
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// sprintf for each row avoids intermediate concatenation.
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3 => (function () use ($users, $header, $footer): string {
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$parts = [$header];
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$active = 0;
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$total = 0.0;
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foreach ($users as $user) {
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$parts[] = sprintf(
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'<tr%s><td>%d</td><td>%s</td><td>%s</td><td>%s</td><td>%s</td></tr>',
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$user['active'] ? '' : ' class="inactive"',
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$user['id'],
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htmlspecialchars($user['name']),
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htmlspecialchars($user['email']),
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number_format($user['score'], 2),
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$user['active'] ? 'Active' : 'Inactive',
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);
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if ($user['active']) {
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$active++;
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}
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$total += $user['score'];
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}
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$parts[] = $footer;
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$parts[] = '<p>Active: ' . $active . '/' . count($users) . '</p>';
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$parts[] = '<p>Avg score: ' . number_format($total / count($users), 2) . '</p>';
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$parts[] = '</body></html>';
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$html = implode('', $parts);
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echo 'Output: ' . strlen($html) . " bytes | Active: {$active}\n";
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return $html;
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})(),
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default => throw new InvalidArgumentException("Usage: php 01-string-processing.php [1|2|3]"),
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};

‎examples/01-string-processing/after.php‎

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‎examples/01-string-processing/before.php‎

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