php-doc-en/reference/openssl/functions/openssl-pkey-get-public.xml

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  <refentry id="function.openssl-pkey-get-public">
   <refnamediv>
    <refname>openssl_pkey_get_public</refname> 
    <refpurpose>Extract public key from certificate and prepare it for use</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
     <methodsynopsis>
      <type>resource</type><methodname>openssl_pkey_get_public</methodname>
      <methodparam><type>mixed</type><parameter>certificate</parameter></methodparam>
     </methodsynopsis>
    <para>
     Returns a positive key resource identifier on success, or &false; on error.
    </para>
    <para>
     <function>openssl_get_publickey</function> extracts the
     public key from <parameter>certificate</parameter> and
     prepares it for use by other functions.
     <parameter>certificate</parameter> can be one of the following:
     <orderedlist>
      <listitem><simpara>an X.509 certificate resource</simpara></listitem>
      <listitem><simpara>a string having the format
        <filename>file://path/to/file.pem</filename>. The named file must
        contain a PEM encoded certificate/private key (it may contain both).
       </simpara>
      </listitem>
      <listitem><simpara>A PEM formatted private key.</simpara></listitem>
     </orderedlist>
    </para>
   </refsect1>
  </refentry>

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