php-doc-en/reference/errorfunc/functions/error-reporting.xml

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  <refentry id="function.error-reporting">
   <refnamediv>
    <refname>error_reporting</refname>
    <refpurpose>set which PHP errors are reported</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
     <methodsynopsis>
      <type>int</type><methodname>error_reporting</methodname>
      <methodparam choice="opt"><type>int</type><parameter>level</parameter></methodparam>
     </methodsynopsis>
    <para>
     Sets PHP's error reporting level and returns the old level.  The
     error reporting level is either a bitmask, or named constant. Using
     named constants is strongly encouraged to ensure compatibility for
     future versions. As error levels are added, the range of integers
     increases, so older integer-based error levels will not always
     behave as expected.
     <example role="php">
      <title>Error Integer changes</title>
      <programlisting role="php">
<![CDATA[
error_reporting (55);   // PHP 3 equivalent to E_ALL ^ E_NOTICE

/* ...in PHP 4, '55' would mean (E_ERROR | E_WARNING | E_PARSE |
E_CORE_ERROR | E_CORE_WARNING) */

error_reporting (2039); // PHP 4 equivalent to E_ALL ^ E_NOTICE

error_reporting (E_ALL ^ E_NOTICE); // The same in both PHP 3 and 4
]]>
      </programlisting>
     </example>
     Follow the links of the constants to get their meanings:
     <table>
      <title><function>error_reporting</function> bit values</title>
      <tgroup cols="2">
       <thead>
        <row>
         <entry>value</entry>
         <entry>constant</entry>
        </row>
       </thead>
       <tbody>
        <row>
         <entry>1</entry>
         <entry>
          <link linkend="internal.e-error">E_ERROR</link>
         </entry>
        </row>
        <row>
         <entry>2</entry>
         <entry>
          <link linkend="internal.e-warning">E_WARNING</link>
         </entry>
        </row>
        <row>
         <entry>4</entry>
         <entry>
          <link linkend="internal.e-parse">E_PARSE</link>
         </entry>
        </row>
        <row>
         <entry>8</entry>
         <entry>
          <link linkend="internal.e-notice">E_NOTICE</link>
         </entry>
        </row>
        <row>
         <entry>16</entry>
         <entry>
          <link linkend="internal.e-core-error">E_CORE_ERROR</link>
         </entry>
        </row>
        <row>
         <entry>32</entry>
         <entry>
          <link linkend="internal.e-core-warning">E_CORE_WARNING</link>
         </entry>
        </row>
        <row>
         <entry>64</entry>
         <entry>
          <link linkend="internal.e-compile-error">E_COMPILE_ERROR</link>
         </entry>
        </row>
        <row>
         <entry>128</entry>
         <entry>
          <link linkend="internal.e-compile-warning">E_COMPILE_WARNING</link>
         </entry>
        </row>
        <row>
         <entry>256</entry>
         <entry>
          <link linkend="internal.e-user-error">E_USER_ERROR</link>
         </entry>
        </row>
        <row>
         <entry>512</entry>
         <entry>
          <link linkend="internal.e-user-warning">E_USER_WARNING</link>
         </entry>
        </row>
        <row>
         <entry>1024</entry>
         <entry>
          <link linkend="internal.e-user-error">E_USER_NOTICE</link>
         </entry>
        </row>
	<row>
	 <entry>2047</entry>
	 <entry>
	  <link linkend="internal.e-all">E_ALL</link>
	 </entry>
	</row>
       </tbody>
      </tgroup>
     </table>
    </para>
    <para>
     <example role="php">
      <title><function>error_reporting</function> examples</title>
      <programlisting role="php">
<![CDATA[
// Turn off all error reporting
error_reporting(0);

// Report simple running errors
error_reporting  (E_ERROR | E_WARNING | E_PARSE);

// Reporting E_NOTICE can be good too (to report uninitialized 
// variables or catch variable name misspellings)
error_reporting (E_ERROR | E_WARNING | E_PARSE | E_NOTICE);

// Report all PHP errors (use bitwise  63  in PHP 3)
error_reporting (E_ALL);
]]>
      </programlisting>
     </example>
    </para>
   </refsect1>
  </refentry>

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