What i would personally do is use regular expression replacement<div><br></div><div>Your search regex will be as follows</div><div><br></div><div>.{4}</div><div><br></div><div>That will match every four characters</div><div>
<br></div><div>The replacement regex will be as follows</div><div><br></div><div>$&amp;-</div><div><br></div><div>That will replace each match i.e. each four characters with the match and then add a dash after<br><br><div class="gmail_quote">
On Tue, Oct 26, 2010 at 9:45 AM, julianne anyim <span dir="ltr">&lt;<a href="mailto:julia.alma@hotmail.com">julia.alma@hotmail.com</a>&gt;</span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">




<div>
Try this.....<br><br>$orig_string = &quot;123456789&quot;;<br>$insert_string = &quot;-&quot;;<br>$position = &quot;4&quot;;<br>$newstring=substr_replace($orig_string, $insert_string, $position, 0);<br>echo $newstring;<br>
<br>Regards,<br>Julianne<br><br><hr>From: <a href="mailto:eriknjenga@gmail.com" target="_blank">eriknjenga@gmail.com</a><br>Date: Mon, 25 Oct 2010 20:12:49 +0300<br>To: <a href="mailto:skunkworks@lists.my.co.ke" target="_blank">skunkworks@lists.my.co.ke</a><br>
Subject: [Skunkworks] PHP String Manipulation<div><div></div><div class="h5"><br><br>Anyone got an idea of an internal PHP function that would enable me to insert a symbol e.g. &#39;-&#39; after every 4 characters in a String? e.g. 12345678 becomes 1234-5678.<br clear="all">
<br>-- <br><span style="background-color:rgb(255, 255, 255);color:rgb(0, 0, 0)"><div>

<span style="background-color:rgb(255, 255, 255);color:rgb(0, 0, 0)"><img width="200" height="30"></span></div></span><div><span style="background-color:rgb(255, 255, 255);color:rgb(0, 0, 0)"><br>

</span></div><div><span style="background-color:rgb(255, 255, 255)">Thanks and Regards,</span><br style="background-color:rgb(255, 255, 255);color:rgb(102, 102, 102)"><span style="background-color:rgb(255, 255, 255)"><font color="#666666">Erick Njenga Nyachwaya,</font></span></div>


<div><span style="background-color:rgb(255, 255, 255)"></span><span style="background-color:rgb(255, 255, 255)"><font color="#999999">M: +254-725-008-790</font></span></div><div><span style="background-color:rgb(255, 255, 255)"><font color="#999999"><br>


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