max() Function Combined with Array Mapping (array_map) Best Practices: How to Improve Efficiency?

Approach to Improving Efficiency

The key to optimization lies in this. If you only need the maximum value and not the complete mapping result, the logic can be executed in a single loop:

<span><span><span class="hljs-variable">$prices</span></span><span> = [</span><span><span class="hljs-number">1999</span></span><span>, </span><span><span class="hljs-number">2500</span></span><span>, </span><span><span class="hljs-number">3200</span></span><span>, </span><span><span class="hljs-number">1800</span></span><span>];
<p></span>$maxPrice = null;<br>
foreach ($prices as $p) {<br>
$converted = $p / 100;<br>
if ($maxPrice === null || $converted > $maxPrice) {<br>
$maxPrice = $converted;<br>
}<br>
}</p>
<p>echo $maxPrice; // Output 32<br>
</span>

This approach avoids creating a new array with array_map, saving memory and improving performance in large data scenarios.

Combining Anonymous Functions with Generators

If you want to maintain a functional style while reducing memory usage, consider using generators:

<span><span><span class="hljs-function"><span class="hljs-keyword">function</span></span></span><span> </span><span><span class="hljs-title">convertPrices</span></span><span>(</span><span><span class="hljs-params"><span class="hljs-variable">$prices</span></span></span><span>) {
    </span><span><span class="hljs-keyword">foreach</span></span><span> (</span><span><span class="hljs-variable">$prices</span></span><span> </span><span><span class="hljs-keyword">as</span></span><span> </span><span><span class="hljs-variable">$p</span></span><span>) {
        </span><span><span class="hljs-keyword">yield</span></span><span> </span><span><span class="hljs-variable">$p</span></span><span> / </span><span><span class="hljs-number">100</span></span><span>;
    }
}
<p></span>$prices = [1999, 2500, 3200, 1800];</p>
<p>$maxPrice = max(iterator_to_array(convertPrices($prices)));</p>
<p>echo $maxPrice; // Output 32<br>
</span>

Although iterator_to_array is used here, in more complex streaming scenarios, generators prevent loading large datasets into memory at once, offering better scalability.

• Related Tags:

  array_map