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    <p><strong><a href="http://php.net/manual/en/language.operators.increment.php" rel="noreferrer">Incrementing / Decrementing Operators</a></strong></p> <p><code>++</code> increment operator</p> <p><code>--</code> decrement operator</p> <pre class="lang-none prettyprint-override"><code>Example Name Effect --------------------------------------------------------------------- ++$a Pre-increment Increments $a by one, then returns $a. $a++ Post-increment Returns $a, then increments $a by one. --$a Pre-decrement Decrements $a by one, then returns $a. $a-- Post-decrement Returns $a, then decrements $a by one. </code></pre> <p>These can go before or after the variable.</p> <p>If put before the variable, the increment/decrement operation is done to the variable <strong>first</strong> then the result is returned. If put after the variable, the variable is <strong>first</strong> returned, then the increment/decrement operation is done.</p> <p>For example:</p> <pre><code>$apples = 10; for ($i = 0; $i &lt; 10; ++$i) { echo 'I have ' . $apples-- . " apples. I just ate one.\n"; } </code></pre> <p><strong><a href="http://codepad.org/5ZD3j0xb" rel="noreferrer">Live example</a></strong></p> <p>In the case above <code>++$i</code> is used, since it is faster. <code>$i++</code> would have the same results.</p> <p>Pre-increment is a little bit faster, because it really increments the variable and after that 'returns' the result. Post-increment creates a special variable, copies there the value of the first variable and only after the first variable is used, replaces its value with second's.</p> <p>However, you must use <code>$apples--</code>, since first you want to display the current number of apples, and <strong>then</strong> you want to subtract one from it.</p> <p>You can also increment letters in PHP:</p> <pre><code>$i = "a"; while ($i &lt; "c") { echo $i++; } </code></pre> <p>Once <code>z</code> is reached <code>aa</code> is next, and so on.</p> <blockquote> <p>Note that character variables can be incremented but not decremented and even so only plain ASCII characters (a-z and A-Z) are supported.</p> </blockquote> <hr> <p><strong>Stack Overflow Posts:</strong></p> <ul> <li><strong><a href="https://stackoverflow.com/questions/1968371/understanding-incrementing">Understanding Incrementing</a></strong> </li> </ul>
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    1. COThe difference is a lot more than just speed... consider $x = 0; $y = $x++; compared with $x = 0; $y = ++$x; and the value of $y in each case
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    2. COThey are also semantically different.
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    3. CO@Mark - I was still editing. I edited in an example to show the semantic difference between the two forms.
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