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copied!<p>According to the docs, the <a href="http://www.php.net/manual/en/ini.core.php#ini.precision" rel="nofollow">precision directive</a> just changes the digits shown when casting numbers to strings:</p> <blockquote> <p><strong>precision</strong> <code>integer</code><br> The number of significant digits displayed in floating point numbers. </p> </blockquote> <p>So it's basically a very convoluted alternative to <a href="http://php.net/number_format" rel="nofollow">number_format()</a> or <a href="http://php.net/money_format" rel="nofollow">money_format()</a>, except that it has less formatting options and it can suffer from some other side effects you might not be aware:</p> <pre><code><?php $_POST['amount'] = '1234567.89'; $amount = floatval($_POST['amount']); var_dump($amount); ini_set('precision', 5); $amount = floatval($_POST['amount']); var_dump($amount); </code></pre> <p>...</p> <pre><code>float(1234567.89) float(1.2346E+6) </code></pre> <p><strong>Edit:</strong></p> <p>I insist: this setting does not alter the way PHP makes mathematical calculations with numbers. It's just a magical way to change format options when <em>converting</em> from floating point numbers (not even integers!) to strings. Example:</p> <pre><code><?php ini_set('precision', 2); $amount = 1000; $price = 98.76; $total = $amount*$price; var_dump($amount, $total); ini_set('precision', 15); var_dump($amount, $total); </code></pre> <p>... prints:</p> <pre><code>int(1000) float(9.9E+4) int(1000) float(98760) </code></pre> <p>Which illustrates that:</p> <ol> <li>Floating point calculations are unaffected, only the <em>display</em> changes</li> <li>Integers are unaffected in all cases</li> </ol>

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