php-doc-en/reference/pcre/functions/preg-last-error.xml

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<refentry id="function.preg-last-error">
 <refnamediv>
  <refname>preg_last_error</refname>
  <refpurpose>Returns the error code of the last PCRE regex execution</refpurpose>
 </refnamediv>

 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>int</type><methodname>preg_last_error</methodname>
   <void />
  </methodsynopsis>
  <para>
   Returns the error code of the last PCRE regex execution.
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   Returns one of the following constants (<link
   linkend="pcre.constants">explained on their own page</link>):
   <simplelist>
    <member><constant>PREG_NO_ERROR</constant></member>
    <member><constant>PREG_INTERNAL_ERROR</constant></member>
    <member><constant>PREG_BACKTRACK_LIMIT_ERROR</constant> (see also <link
    linkend="ini.pcre.backtrack-limit">pcre.backtrack_limit</link></member>
    <member><constant>PREG_RECURSION_LIMIT_ERROR</constant> (see also <link
    linkend="ini.pcre.recursion-limit">pcre.recursion_limit</link></member>
    <member><constant>PREG_BAD_UTF8_ERROR</constant></member>
   </simplelist>
  </para>
 </refsect1>
</refentry>

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