php-doc-en/reference/filesystem/functions/is-file.xml

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  <refentry id="function.is-file">
   <refnamediv>
    <refname>is_file</refname>
    <refpurpose>Tells whether the filename is a regular file</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
     <methodsynopsis>
      <type>bool</type><methodname>is_file</methodname>
      <methodparam><type>string</type><parameter>filename</parameter></methodparam>
     </methodsynopsis>
    <para>
     Returns &true; if the filename exists and is a regular file.
    </para>

    &note.clearstatcache;
    
    &tip.fopen-wrapper.stat;

    <para>
     See also <function>is_dir</function> and
     <function>is_link</function>.
    </para>
   </refsect1>
  </refentry>

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