Question

I have this code!

<div class="time\54>  
<div class="time\98">  
<div class="time\69">  
<div id="result">{INFO}</div>  

I need to take last

'<div class="time\69">'

Then take numbers in this last div after ‘time’,and sum it (6+9), then put result into {INFO} field.
Need use only preg_replace

Result:

<div class="time\54>  
<div class="time\98">  
<div class="time\69">  
<div id="result">15</div>  

How to take last child (element div)?
How to do a sum of numbers?
How to remember (use $1 , or %1) ?
Thx.

Answer 1

$src = '<div class="edit\5451" style="width:100%; text-align:left">  
<div style="padding:0px 25px 0px 25px" align="left" class="edit\9874">  
<div class="edit\6924" style="padding:0px 0px 6px 0px">  
<div id="result">{RESULT}</div> ';

echo preg_replace('#(<div class="edit[\\\])([0-9]+)("[^<]+<div id="result">)([^<]+)(</div>)#mse','"$1$2$3".array_sum(str_split($2))."$5"', $src);