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This function will return you substring of any number of characters without broken last word. Very useful function and easy to extend as you need.

function StringWithFullWords($MainString,$NoOrCharecter=10)
{
$Tmp=str_split($MainString,1);
for($I=0;$I$NoOrCharecter)
break;
if($Tmp[$I]==” “)
$LastSpacePos=$I;
}
return substr($MainString,0,$LastSpacePos);
}