<h3>substr() function</h3>
Return a part of a string

<p><h4>Syntax</h4>
     substr(<i>string,startpos,length</i>)</p>

<p><h4>Arguments</h4>
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<i>  string</i> &rarr; is string.  The full string.<br>
<i>  startpos</i> &rarr; is number.  The start position to extract from.<br>
<i>  length</i> &rarr; is number.  The length of the string to extract.<br></p>

<p><h4>Example</h4>
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     substr('HELLO WORLD',3,5) &rarr; 'LLO W'</p>
