php-doc-en/reference/dba/functions/dba-exists.xml

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  <refentry id="function.dba-exists">
   <refnamediv>
    <refname>dba_exists</refname>
    <refpurpose>Check whether key exists</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
     <methodsynopsis>
      <type>bool</type><methodname>dba_exists</methodname>
      <methodparam><type>string</type><parameter>key</parameter></methodparam>
      <methodparam><type>resource</type><parameter>handle</parameter></methodparam>
     </methodsynopsis>
    <para>
     <function>dba_exists</function> checks whether the specified
     <parameter>key</parameter> exists in the database specified by
     <parameter>handle</parameter>.
    </para>
    <para>
     <parameter>Key</parameter> is the key the check is performed for.
    </para>
    <para>
     <parameter>Handle</parameter> is a database handle returned by
     <function>dba_open</function>.
    </para>
    <para>
     <function>dba_exists</function> returns &true; or &false;, if the key is found
     or not found, respectively.
    </para>
    <para>
     See also: <function>dba_fetch</function>,
     <function>dba_delete</function>, <function>dba_insert</function>,
     and <function>dba_replace</function>.
    </para>
   </refsect1>
  </refentry>

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