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<h1>Predefined Constants</h1>
<p class="simpara">
The constants below are always available as part of the PHP core.
</p>
<dl>
<dt id="constant.php-output-handler-start">
<span class="term">
<strong><code>PHP_OUTPUT_HANDLER_START</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<p class="para">
Indicates that output buffering has begun.
</p>
</dd>
</dt>
<dt id="constant.php-output-handler-write">
<span class="term">
<strong><code>PHP_OUTPUT_HANDLER_WRITE</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<p class="para">
Indicates that the output buffer is being flushed, and had data to output.
</p>
<p class="para">
Available since PHP 5.4.
</p>
</dd>
</dt>
<dt id="constant.php-output-handler-flush">
<span class="term">
<strong><code>PHP_OUTPUT_HANDLER_FLUSH</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<p class="para">
Indicates that the buffer has been flushed.
</p>
<p class="para">
Available since PHP 5.4.
</p>
</dd>
</dt>
<dt id="constant.php-output-handler-clean">
<span class="term">
<strong><code>PHP_OUTPUT_HANDLER_CLEAN</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<p class="para">
Indicates that the output buffer has been cleaned.
</p>
<p class="para">
Available since PHP 5.4.
</p>
</dd>
</dt>
<dt id="constant.php-output-handler-final">
<span class="term">
<strong><code>PHP_OUTPUT_HANDLER_FINAL</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<p class="para">
Indicates that this is the final output buffering operation.
</p>
<p class="para">
Available since PHP 5.4.
</p>
</dd>
</dt>
<dt id="constant.php-output-handler-cont">
<span class="term">
<strong><code>PHP_OUTPUT_HANDLER_CONT</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<p class="para">
Indicates that the buffer has been flushed, but output buffering will
continue.
</p>
<p class="para">
As of PHP 5.4, this is an alias for
<strong><code>PHP_OUTPUT_HANDLER_WRITE</code></strong>.
</p>
</dd>
</dt>
<dt id="constant.php-output-handler-end">
<span class="term">
<strong><code>PHP_OUTPUT_HANDLER_END</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<p class="para">
Indicates that output buffering has ended.
</p>
<p class="para">
As of PHP 5.4, this is an alias for
<strong><code>PHP_OUTPUT_HANDLER_FINAL</code></strong>.
</p>
</dd>
</dt>
<dt id="constant.php-output-handler-cleanable">
<span class="term">
<strong><code>PHP_OUTPUT_HANDLER_CLEANABLE</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<p class="para">
Controls whether an output buffer created by
<span class="function"><a href="function.ob-start.html" class="function">ob_start()</a></span> can be cleaned.
</p>
<p class="para">
Available since PHP 5.4.
</p>
</dd>
</dt>
<dt id="constant.php-output-handler-flushable">
<span class="term">
<strong><code>PHP_OUTPUT_HANDLER_FLUSHABLE</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<p class="para">
Controls whether an output buffer created by
<span class="function"><a href="function.ob-start.html" class="function">ob_start()</a></span> can be flushed.
</p>
<p class="para">
Available since PHP 5.4.
</p>
</dd>
</dt>
<dt id="constant.php-output-handler-removable">
<span class="term">
<strong><code>PHP_OUTPUT_HANDLER_REMOVABLE</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<p class="para">
Controls whether an output buffer created by
<span class="function"><a href="function.ob-start.html" class="function">ob_start()</a></span> can be removed before the end of the script.
</p>
<p class="para">
Available since PHP 5.4.
</p>
</dd>
</dt>
<dt id="constant.php-output-handler-stdflags">
<span class="term">
<strong><code>PHP_OUTPUT_HANDLER_STDFLAGS</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<p class="para">
The default set of output buffer flags; currently equivalent to
<strong><code>PHP_OUTPUT_HANDLER_CLEANABLE</code></strong> |
<strong><code>PHP_OUTPUT_HANDLER_FLUSHABLE</code></strong> |
<strong><code>PHP_OUTPUT_HANDLER_REMOVABLE</code></strong>.
</p>
<p class="para">
Available since PHP 5.4.
</p>
</dd>
</dt>
</dl>
</div>
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