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<!doctype html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width,initial-scale=1"><title>Invoice Number Sequence — PHP Composer Package (gap-free, year reset, PDO store, audit report)</title><style>body{max-width:820px;margin:40px auto;padding:0 18px;font-family:system-ui,sans-serif;line-height:1.6}pre{background:#f6f4ef;padding:16px;border-radius:10px;overflow:auto}code{background:#f6f4ef;padding:2px 5px;border-radius:4px}</style><script data-grow-initializer="">!(function(){window.growMe||((window.growMe=function(e){window.growMe._.push(e);}),(window.growMe._=[]));var e=document.createElement("script");(e.type="text/javascript"),(e.src="https://faves.grow.me/main.js"),(e.defer=!0),e.setAttribute("data-grow-faves-site-id","U2l0ZTphZjljMzgyMC0yMmU5LTRhYjgtYTIxNS03OTRhMGY1N2ExYzM=");var t=document.getElementsByTagName("script")[0];t.parentNode.insertBefore(e,t);})();</script>
<!--yj-canon-s101--><link rel="canonical" href="https://getreadystack.com/tools/composer-package-invoice-number-sequence-php"></head><body><h1>Invoice Number Sequence — PHP Composer Package (gap-free, year reset, PDO store, audit report)</h1><p>Gap-free document numbering for PHP 8.1+: invoice, credit-note and order numbers with year/quarter/month/day reset, atomic counter stores (in-memory, JSON file, PDO with row locking), takeover of an existing number range, and a gap-and-duplicate audit report. No runtime dependencies.</p><h2>Install</h2><pre>composer require numberkit/document-sequence-pro</pre><h2>Files</h2><ul><li><code>src/Clock.php</code></li><li><code>src/SystemClock.php</code></li><li><code>src/FrozenClock.php</code></li><li><code>src/Reset.php</code></li><li><code>src/Pattern.php</code></li><li><code>src/IssuedNumber.php</code></li><li><code>src/ParsedNumber.php</code></li><li><code>src/CounterStore.php</code></li><li><code>src/SequenceGenerator.php</code></li><li><code>src/Store/InMemoryCounterStore.php</code></li><li><code>src/Store/JsonFileCounterStore.php</code></li><li><code>src/Store/PdoCounterStore.php</code></li></ul>
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