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<title>What has changed in PHP 5.4.x</title>
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<div class="prev" style="text-align: left; float: left;"><a href="migration54.html">Migrating from PHP 5.3.x to PHP 5.4.x</a></div>
<div class="next" style="text-align: right; float: right;"><a href="migration54.incompatible.html">Backward Incompatible Changes</a></div>
<div class="up"><a href="migration54.html">Migrating from PHP 5.3.x to PHP 5.4.x</a></div>
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<h2 class="title">What has changed in PHP 5.4.x</h2>
<p class="simpara">
Most improvements in PHP 5.4.x have no impact on existing code. There are
a <a href="migration54.incompatible.html" class="link">few incompatibilities</a>
and <a href="migration54.new-features.html" class="link">new features</a> that should
be considered, and code should be tested before switching PHP
versions in production environments.
</p>
<p class="simpara">
For systems being upgraded from an older version of PHP, the relevant
documentation is available at:
</p>
<ul class="itemizedlist">
<li class="listitem">
<span class="simpara">
<a href="migration53.html" class="link">Upgrade Notes for PHP 5.3.x</a>.
</span>
</li>
<li class="listitem">
<span class="simpara">
<a href="migration52.html" class="link">Upgrade Notes for PHP 5.2.x</a>.
</span>
</li>
<li class="listitem">
<span class="simpara">
<a href="migration51.html" class="link">Upgrade Notes for PHP 5.1.x</a>.
</span>
</li>
<li class="listitem">
<span class="simpara">
<a href="migration5.html" class="link">Migrating from PHP 4 to PHP 5</a>.
</span>
</li>
</ul>
</div><hr /><div class="manualnavbar" style="text-align: center;">
<div class="prev" style="text-align: left; float: left;"><a href="migration54.html">Migrating from PHP 5.3.x to PHP 5.4.x</a></div>
<div class="next" style="text-align: right; float: right;"><a href="migration54.incompatible.html">Backward Incompatible Changes</a></div>
<div class="up"><a href="migration54.html">Migrating from PHP 5.3.x to PHP 5.4.x</a></div>
<div class="home"><a href="index.html">PHP Manual</a></div>
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