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echo "<h1>Efficiency Comparison Between chr() Function and Other String Concatenation Methods: Which Is Faster and Better?</h1>";</p>
<p>echo <span><span class="hljs-string">"<p>In PHP, string concatenation is a very common operation in daily development. Different concatenation methods may have performance differences, especially when handling large amounts of data or in high-frequency scenarios. This article mainly compares <code>chr()
