php-doc-en/reference/mysqli/functions/mysqli-error.xml

<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.14 $ -->
  <refentry id="function.mysqli-error">
   <refnamediv>
    <refname>mysqli_error</refname>
    <refpurpose>Returns a string description of the last error</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
    <para>Procedural style:</para>
     <methodsynopsis>
      <type>string</type><methodname>mysqli_error</methodname>
      <methodparam><type>mysqli</type><parameter>link</parameter></methodparam>
     </methodsynopsis>
    <para>Object oriented style (property)</para>
    <classsynopsis>
     <ooclass><classname>mysqli</classname></ooclass>
     <fieldsynopsis><type>string</type><varname>error</varname></fieldsynopsis>
    </classsynopsis>
    <para>
     The <function>mysqli_error</function> function is identical to the corresponding
     <function>mysqli_errno</function> function in every way, except instead of returning
     an integer error code the <function>mysqli_error</function> function will return
     a string representation of the last error to occur for the database connection 
     represented by the <parameter>link</parameter> parameter. If no error has occured,
     this function will return an empty string.
    </para>
   </refsect1>
   <refsect1>
    &reftitle.returnvalues;
    <para>
      A string that describes the error. An empty string if no error occurred. 
    </para>
   </refsect1>
   <refsect1>
    &reftitle.seealso;
    <para>
     <function>mysqli_connect_errno</function>,
     <function>mysqli_connect_error</function>,
     <function>mysqli_errno</function>&listendand;
     <function>mysqli_sqlstate</function>.
    </para>
   </refsect1>
   <refsect1>
    &reftitle.examples;
    <example>
     <title>Object oriented style</title>
     <programlisting role="php">
<![CDATA[
<?php
$mysqli = new mysqli("localhost", "my_user", "my_password", "world");

/* check connection */
if (mysqli_connect_errno()) {
    printf("Connect failed: %s\n", mysqli_connect_error());
    exit();
}

if (!$mysqli->query("SET a=1")) {
    printf("Errormessage: %s\n", $mysqli->error);
}

/* close connection */
$mysqli->close();
?>
]]>
    </programlisting>
    </example>
    <example>
     <title>Procedural style</title>
     <programlisting role="php">
<![CDATA[
<?php
$link = mysqli_connect("localhost", "my_user", "my_password", "world");

/* check connection */
if (mysqli_connect_errno()) {
    printf("Connect failed: %s\n", mysqli_connect_error());
    exit();
}

if (!mysqli_query($link, "SET a=1")) {
    printf("Errormessage: %s\n", mysqli_error($link));
}

/* close connection */
mysqli_close($link);
?>
]]>
     </programlisting>
    </example>
    &example.outputs;
    <screen>
<![CDATA[
Errormessage: Unknown system variable 'a'
]]>
    </screen>
   </refsect1>
  </refentry>

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