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<h1>Predefined Constants</h1>
<p class="simpara">
The constants below are always available as part of the PHP core.
</p>
<blockquote class="note"><p><strong class="note">Note</strong>:
<span class="simpara">
You may use these constant names in <var class="filename">php.ini</var> but not outside
of PHP, like in <var class="filename">httpd.conf</var>, where you'd
use the bitmask values instead.
</span>
</p></blockquote>
<table id="errorfunc.constants.errorlevels" class="doctable table">
<caption><strong>Errors and Logging</strong></caption>
<thead>
<tr>
<th>Value</th>
<th>Constant</th>
<th>Description</th>
<th>Note</th>
</tr>
</thead>
<tbody class="tbody">
<tr id="errorfunc.constants.errorlevels.e-error">
<td>1</td>
<td>
<strong><code>E_ERROR</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</td>
<td>
Fatal run-time errors. These indicate errors that can not be
recovered from, such as a memory allocation problem.
Execution of the script is halted.
</td>
<td class="empty"> </td>
</tr>
<tr id="errorfunc.constants.errorlevels.e-warning">
<td>2</td>
<td>
<strong><code>E_WARNING</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</td>
<td>
Run-time warnings (non-fatal errors). Execution of the script is not
halted.
</td>
<td class="empty"> </td>
</tr>
<tr id="errorfunc.constants.errorlevels.e-parse">
<td>4</td>
<td>
<strong><code>E_PARSE</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</td>
<td>
Compile-time parse errors. Parse errors should only be generated by
the parser.
</td>
<td class="empty"> </td>
</tr>
<tr id="errorfunc.constants.errorlevels.e-notice">
<td>8</td>
<td>
<strong><code>E_NOTICE</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</td>
<td>
Run-time notices. Indicate that the script encountered something that
could indicate an error, but could also happen in the normal course of
running a script.
</td>
<td class="empty"> </td>
</tr>
<tr id="errorfunc.constants.errorlevels.e-core-error">
<td>16</td>
<td>
<strong><code>E_CORE_ERROR</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</td>
<td>
Fatal errors that occur during PHP's initial startup. This is like an
<strong><code>E_ERROR</code></strong>, except it is generated by the core of PHP.
</td>
<td class="empty"> </td>
</tr>
<tr id="errorfunc.constants.errorlevels.e-core-warning">
<td>32</td>
<td>
<strong><code>E_CORE_WARNING</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</td>
<td>
Warnings (non-fatal errors) that occur during PHP's initial startup.
This is like an <strong><code>E_WARNING</code></strong>, except it is generated
by the core of PHP.
</td>
<td class="empty"> </td>
</tr>
<tr id="errorfunc.constants.errorlevels.e-compile-error">
<td>64</td>
<td>
<strong><code>E_COMPILE_ERROR</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</td>
<td>
Fatal compile-time errors. This is like an <strong><code>E_ERROR</code></strong>,
except it is generated by the Zend Scripting Engine.
</td>
<td class="empty"> </td>
</tr>
<tr id="errorfunc.constants.errorlevels.e-compile-warning">
<td>128</td>
<td>
<strong><code>E_COMPILE_WARNING</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</td>
<td>
Compile-time warnings (non-fatal errors). This is like an
<strong><code>E_WARNING</code></strong>, except it is generated by the Zend
Scripting Engine.
</td>
<td class="empty"> </td>
</tr>
<tr id="errorfunc.constants.errorlevels.e-user-error">
<td>256</td>
<td>
<strong><code>E_USER_ERROR</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</td>
<td>
User-generated error message. This is like an
<strong><code>E_ERROR</code></strong>, except it is generated in PHP code by
using the PHP function <span class="function"><a href="function.trigger-error.html" class="function">trigger_error()</a></span>.
</td>
<td class="empty"> </td>
</tr>
<tr id="errorfunc.constants.errorlevels.e-user-warning">
<td>512</td>
<td>
<strong><code>E_USER_WARNING</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</td>
<td>
User-generated warning message. This is like an
<strong><code>E_WARNING</code></strong>, except it is generated in PHP code by
using the PHP function <span class="function"><a href="function.trigger-error.html" class="function">trigger_error()</a></span>.
</td>
<td class="empty"> </td>
</tr>
<tr id="errorfunc.constants.errorlevels.e-user-notice">
<td>1024</td>
<td>
<strong><code>E_USER_NOTICE</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</td>
<td>
User-generated notice message. This is like an
<strong><code>E_NOTICE</code></strong>, except it is generated in PHP code by
using the PHP function <span class="function"><a href="function.trigger-error.html" class="function">trigger_error()</a></span>.
</td>
<td class="empty"> </td>
</tr>
<tr id="errorfunc.constants.errorlevels.e-strict">
<td>2048</td>
<td>
<strong><code>E_STRICT</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</td>
<td>
Enable to have PHP suggest changes
to your code which will ensure the best interoperability
and forward compatibility of your code.
</td>
<td>Since PHP 5 but not included in <strong><code>E_ALL</code></strong> until PHP 5.4.0</td>
</tr>
<tr id="errorfunc.constants.errorlevels.e-recoverable-error">
<td>4096</td>
<td>
<strong><code>E_RECOVERABLE_ERROR</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</td>
<td>
Catchable fatal error. It indicates that a probably dangerous error
occurred, but did not leave the Engine in an unstable state. If the error
is not caught by a user defined handle (see also
<span class="function"><a href="function.set-error-handler.html" class="function">set_error_handler()</a></span>), the application aborts as it
was an <strong><code>E_ERROR</code></strong>.
</td>
<td>Since PHP 5.2.0</td>
</tr>
<tr id="errorfunc.constants.errorlevels.e-deprecated-error">
<td>8192</td>
<td>
<strong><code>E_DEPRECATED</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</td>
<td>
Run-time notices. Enable this to receive warnings about code
that will not work in future versions.
</td>
<td>Since PHP 5.3.0</td>
</tr>
<tr id="errorfunc.constants.errorlevels.e-user-deprecated">
<td>16384</td>
<td>
<strong><code>E_USER_DEPRECATED</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</td>
<td>
User-generated warning message. This is like an
<strong><code>E_DEPRECATED</code></strong>, except it is generated in PHP code by
using the PHP function <span class="function"><a href="function.trigger-error.html" class="function">trigger_error()</a></span>.
</td>
<td>Since PHP 5.3.0</td>
</tr>
<tr id="errorfunc.constants.errorlevels.e-all">
<td>32767</td>
<td>
<strong><code>E_ALL</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</td>
<td>
All errors and warnings, as supported, except of level
<strong><code>E_STRICT</code></strong> prior to PHP 5.4.0.
</td>
<td>
32767 in PHP 5.4.x,
30719 in PHP 5.3.x,
6143 in PHP 5.2.x,
2047 previously
</td>
</tr>
</tbody>
</table>
<p class="para">
The above values (either numerical or symbolic) are used to build
up a bitmask that specifies which errors to report. You can use the
<a href="language.operators.bitwise.html" class="link">bitwise operators</a>
to combine these values or mask out certain types of errors. Note
that only '|', '~', '!', '^' and '&' will be understood within
<var class="filename">php.ini</var>.
</p>
</div>
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