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

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<refentry id="function.error-reporting">
 <refnamediv>
  <refname>error_reporting</refname>
  <refpurpose>Sets which PHP errors are reported</refpurpose>
 </refnamediv>

 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>int</type><methodname>error_reporting</methodname>
   <methodparam choice="opt"><type>int</type><parameter>level</parameter></methodparam>
  </methodsynopsis>
  <para>
   The <function>error_reporting</function> function sets the
   <link linkend="ini.error-reporting">error_reporting</link>
   directive at runtime.  PHP has many levels of errors, using
   this function sets that level for the duration (runtime) of
   your script.
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>level</parameter></term>
     <listitem>
      <para>
       The new <link linkend="ini.error-reporting">error_reporting</link>
       level. It takes on either a bitmask, or named constants. 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.
      </para>
      <para>
       The available error level constants are listed below. The actual
       meanings of these error levels are described in the
       <link linkend="errorfunc.constants">predefined constants</link>.
       <table>
        <title><function>error_reporting</function> level constants and bit values</title>
        <tgroup cols="2">
         <thead>
          <row>
           <entry>value</entry>
           <entry>constant</entry>
          </row>
         </thead>
         <tbody>
          <row>
           <entry>1</entry>
           <entry>
            <link linkend="e-error">E_ERROR</link>
           </entry>
          </row>
          <row>
           <entry>2</entry>
           <entry>
            <link linkend="e-warning">E_WARNING</link>
           </entry>
          </row>
          <row>
           <entry>4</entry>
           <entry>
            <link linkend="e-parse">E_PARSE</link>
           </entry>
          </row>
          <row>
           <entry>8</entry>
           <entry>
            <link linkend="e-notice">E_NOTICE</link>
           </entry>
          </row>
          <row>
           <entry>16</entry>
           <entry>
            <link linkend="e-core-error">E_CORE_ERROR</link>
           </entry>
          </row>
          <row>
           <entry>32</entry>
           <entry>
            <link linkend="e-core-warning">E_CORE_WARNING</link>
           </entry>
          </row>
          <row>
           <entry>64</entry>
           <entry>
            <link linkend="e-compile-error">E_COMPILE_ERROR</link>
           </entry>
          </row>
          <row>
           <entry>128</entry>
           <entry>
            <link linkend="e-compile-warning">E_COMPILE_WARNING</link>
           </entry>
          </row>
          <row>
           <entry>256</entry>
           <entry>
            <link linkend="e-user-error">E_USER_ERROR</link>
           </entry>
          </row>
          <row>
           <entry>512</entry>
           <entry>
            <link linkend="e-user-warning">E_USER_WARNING</link>
           </entry>
          </row>
          <row>
           <entry>1024</entry>
           <entry>
            <link linkend="e-user-error">E_USER_NOTICE</link>
           </entry>
          </row>
          <row>
           <entry>2047</entry>
           <entry>
           <link linkend="e-all">E_ALL</link>
           </entry>
         </row>
          <row>
           <entry>2048</entry>
           <entry>
            <link linkend="e-strict">E_STRICT</link>
           </entry>
          </row>
         </tbody>
        </tgroup>
       </table>
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   Returns the old <link linkend="ini.error-reporting">error_reporting</link>
   level.
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>error_reporting</function> examples</title>
    <programlisting role="php">
<![CDATA[
<?php

// 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 errors except E_NOTICE
// This is the default value set in php.ini
error_reporting(E_ALL ^ E_NOTICE);

// Report all PHP errors (bitwise 63 may be used in PHP 3)
error_reporting(E_ALL);

// Same as error_reporting(E_ALL);
ini_set('error_reporting', E_ALL);

?>
]]>
    </programlisting>
   </example>
  </para>
 </refsect1>

 <refsect1 role="notes">
  &reftitle.notes;
  <warning>
   <simpara>
    With PHP &gt; 5.0.0 <constant>E_STRICT</constant> with value 2048 is
    available. <constant>E_ALL</constant> does <emphasis>NOT</emphasis>
    include error level <constant>E_STRICT</constant>.
    Most of <constant>E_STRICT</constant> errors are evaluated at the
    compile time thus such errors are not reported in the file where
    <link linkend="ini.error-reporting">error_reporting</link> is enhanced
    to include <constant>E_STRICT</constant> errors.
   </simpara>
  </warning>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member>The <link linkend="ini.display-errors">display_errors</link> directive</member>
    <member><function>ini_set</function></member>
   </simplelist>
  </para>
 </refsect1>
</refentry>

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