php-doc-en/reference/errorfunc/constants.xml

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<section id="errorfunc.constants">
 &reftitle.constants;
 <simpara>
  These constants are part of the PHP core and always available. 
 </simpara>
 <table>
  <title>Errors and Logging</title>
  <tgroup cols="3">
   <thead>
    <row>
     <entry>Value</entry>
     <entry>Constant</entry>
     <entry>Description</entry>
    </row>
   </thead>
   <tbody>
    <row>
     <entry>1</entry>
     <entry>
      <constant>E_ERROR</constant> 
      (<type>integer</type>)
     </entry>
     <entry>
      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.
     </entry>
    </row>

    <row>
     <entry>2</entry>
     <entry>
      <constant>E_WARNING</constant> 
      (<type>integer</type>)
     </entry>
     <entry>
      Run-time warnings (non-fatal errors). Execution of the script is not
      halted.
     </entry>
    </row>

    <row>
     <entry>4</entry>
     <entry>
      <constant>E_PARSE</constant> 
      (<type>integer</type>)
     </entry>
     <entry>
      Compile-time parse errors. Parse errors should only be generated by
      the parser.
     </entry>
    </row>

    <row>
     <entry>8</entry>
     <entry>
      <constant>E_NOTICE</constant> 
      (<type>integer</type>)
     </entry>
     <entry>
      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.
     </entry>
    </row>

    <row>
     <entry>16</entry>
     <entry>
      <constant>E_CORE_ERROR</constant> 
      (<type>integer</type>)
     </entry>
     <entry>
      Fatal errors that occur during PHP's initial startup. This is like an
      <constant>E_ERROR</constant>, except it is generated by the core of PHP.
     </entry>
    </row>

    <row>
     <entry>32</entry>
     <entry>
      <constant>E_CORE_WARNING</constant> 
      (<type>integer</type>)
     </entry>
     <entry>
      Warnings (non-fatal errors) that occur during PHP's initial startup.
      This is like an <constant>E_WARNING</constant>, except it is generated
      by the core of PHP. PHP 4 only.
     </entry>
    </row>

    <row>
     <entry>64</entry>
     <entry>
      <constant>E_COMPILE_ERROR</constant> 
      (<type>integer</type>)
     </entry>
     <entry>
      Fatal compile-time errors. This is like an <constant>E_ERROR</constant>,
      except it is generated by the Zend Scripting Engine. PHP 4 only.
     </entry>
    </row>

    <row>
     <entry>128</entry>
     <entry>
      <constant>E_COMPILE_WARNING</constant> 
      (<type>integer</type>)
     </entry>
     <entry>
      Compile-time warnings (non-fatal errors). This is like an
      <constant>E_WARNING</constant>, except it is generated by the Zend
      Scripting Engine. PHP 4 only.
     </entry>
    </row>

    <row>
     <entry>256</entry>
     <entry>
      <constant>E_USER_ERROR</constant> 
      (<type>integer</type>)
     </entry>
     <entry>
      User-generated error message. This is like an
      <constant>E_ERROR</constant>, except it is generated in PHP code by
      using the PHP function <function>trigger_error</function>.
      PHP 4 only.
     </entry>
    </row>

    <row>
     <entry>512</entry>
     <entry>
      <constant>E_USER_WARNING</constant> 
      (<type>integer</type>)
     </entry>
     <entry>
      User-generated warning message. This is like an
      <constant>E_WARNING</constant>, except it is generated in PHP code by
      using the PHP function <function>trigger_error</function>.
      PHP 4 only.
     </entry>
    </row>

    <row>
     <entry>1024</entry>
     <entry>
      <constant>E_USER_NOTICE</constant> 
      (<type>integer</type>)
     </entry>
     <entry>
      User-generated notice message. This is like an
      <constant>E_NOTICE</constant>, except it is generated in PHP code by
      using the PHP function <function>trigger_error</function>.
      PHP 4 only.
     </entry>
    </row>

    <row>
     <entry>2047</entry>
     <entry>
      <constant>E_ALL</constant> 
      (<type>integer</type>)
     </entry>
     <entry>
      All errors and warnings, as supported.
     </entry>
    </row>

   </tbody>
  </tgroup>
 </table>

</section> 

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