php-doc-en/reference/mysqli/functions/mysqli-bind-param.xml

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  <refentry id="function.mysqli-bind-param">
   <refnamediv>
    <refname>mysqli_bind_param</refname>
    <refname>stmt->bind_param</refname>
    <refpurpose>Binds variables to a prepared statement as parameters</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
    <para>Procedural style:</para>
    <methodsynopsis>
     <type>bool</type><methodname>mysqli_bind_param</methodname>
     <methodparam><type>object</type><parameter>stmt</parameter></methodparam>
     <methodparam><type>string</type><parameter>types</parameter></methodparam>
     <methodparam><type>mixed</type><parameter>var1</parameter></methodparam>
     <methodparam choice="opt"><type>mixed</type><parameter>var2, ...</parameter></methodparam>
    </methodsynopsis>
    <para>Object oriented style (method):</para>
    <classsynopsis>
     <ooclass><classname>stmt</classname></ooclass>
     <methodsynopsis>
      <type>bool</type>
       <methodname>bind_param</methodname>
      <methodparam><type>array</type><parameter>types</parameter></methodparam>
      <methodparam><type>mixed</type><parameter>var1</parameter></methodparam>
      <methodparam choice="opt"><type>mixed</type><parameter>var2, ...</parameter></methodparam>
     </methodsynopsis>
    </classsynopsis>
    <para>
     <function>mysql_bind_param</function> is used to bind variables for the
     parameter markers in the SQL statement that was passed to
     <function>mysql_prepare</function>. 
     The string <parameter>types</parameter> contains one or more characters which specify
     the types for the corresponding bind variables
     <table>
      <title>Type specification chars</title>
      <tgroup cols='2'>
       <thead>
        <row>
         <entry>Character</entry>
         <entry>Description</entry>
        </row>
       </thead>
       <tbody>
        <row>
         <entry>i</entry>
         <entry>corresponding variable has type integer</entry>
        </row>
        <row>
         <entry>d</entry>
         <entry>corresponding variable has type double</entry>
        </row>
        <row>
         <entry>s</entry>
         <entry>corresponding variable has type string</entry>
        </row>
        <row>
         <entry>b</entry>
         <entry>corresponding variable is a blob and will be send in packages</entry>
        </row>
       </tbody>
      </tgroup>
     </table>
    </para>
    <note>
      <para>
       If data size of a variable exceeds max. allowed package size
       (max_allowed_package), you have to specify <literal>b</literal> in 
       <parameter>types</parameter> and use
       <function>mysqli_send_long_data</function> to send the data in packages.
      </para>
      <para>
       The number of variables and length of
       string <parameter>types</parameter> must match the parameters in the statement.
     </para>
    </note>
   </refsect1>
   <refsect1>
    <title>Return values</title>
    <para>
     &return.success;
    </para>
   </refsect1>
   <refsect1>
   <title>See also</title>
    <para>
     <function>mysqli_bind_result</function>,
     <function>mysqli_execute</function>,
     <function>mysqli_fetch</function>,
     <function>mysqli_prepare</function>,
     <function>mysqli_send_long_data</function>,
     <function>mysqli_stmt_errno</function>,
     <function>mysqli_stmt_error</function>
    </para>
   </refsect1>
   <refsect1>
    <title>Example</title>
    <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();
}

$stmt = $mysqli->prepare("INSERT INTO CountryLanguage VALUES (?, ?, ?, ?)");
$stmt->bind_param('sssd', $code, $language, $official, $percent);

$code = 'DEU';
$language = 'Bavarian';
$official = "F";
$percent = 11.2;

/* execute prepared statement */
$stmt->execute();

printf("%d Row inserted.\n", $stmt->affected_rows);

/* close statement and connection */
$stmt->close();

/* Clean up table CountryLanguage */
$mysqli->query("DELETE FROM CountryLanguage WHERE Language='Bavarian'");
printf("%d Row deleted.\n", $mysqli->affected_rows);

/* 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 (!$link) {
    printf("Connect failed: %s\n", mysqli_connect_error());
    exit();
}

$stmt = mysqli_prepare($link, "INSERT INTO CountryLanguage VALUES (?, ?, ?, ?)");
mysqli_bind_param($stmt, 'sssd', $code, $language, $official, $percent);

$code = 'DEU';
$language = 'Bavarian';
$official = "F";
$percent = 11.2;

/* execute prepared statement */
mysqli_execute($stmt);

printf("%d Row inserted.\n", mysqli_stmt_affected_rows($stmt));

/* close statement and connection */
mysqli_stmt_close($stmt);

/* Clean up table CountryLanguage */
mysqli_query($link, "DELETE FROM CountryLanguage WHERE Language='Bavarian'");
printf("%d Row deleted.\n", mysqli_affected_rows($link));

/* close connection */
mysqli_close($link);
?>
]]>
     </programlisting>
    </example>
    <para>
     The above examples would produce the following output:
    </para>
    <screen>
<![CDATA[
1 Row inserted.
1 Row deleted.
]]>
    </screen>
   </refsect1>
  </refentry>

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