php-doc-en/reference/dom/functions/dom-domcharacterdata-substringdata.xml

<?xml version="1.0" encoding="iso-8859-1"?>
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  <refentry id='function.dom-domcharacterdata-substringdata'>
   <refnamediv>
    <refname>DOMCharacterData->substringData</refname>
    <refpurpose>
     Extracts a range of data from the node
    </refpurpose>
   </refnamediv>
   <refsect1>
    &reftitle.description;
    <classsynopsis>
     <ooclass><classname>DOMCharacterData</classname></ooclass>
     <methodsynopsis>
      <type>string</type>
      <methodname>substringData</methodname>
      <methodparam><type>int</type><parameter>offset</parameter></methodparam>
      <methodparam><type>int</type><parameter>count</parameter></methodparam>
     </methodsynopsis>
    </classsynopsis>
    <para>
     Returns the specified substring. If the sum of <parameter>offset</parameter> 
     and <parameter>count</parameter> exceeds the length, then all 16-bit units 
      to the end of the data are returned.
    </para>
    <para>
     Throws <classname>DOMException</classname> if <parameter>offset</parameter> 
      is negative or greater than the number of 16-bit units in data, or if 
      <parameter>count</parameter> is negative.
    </para>
   </refsect1>
  </refentry>

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