<?php
$number=55;
while($number>9)
$number=array_sum(str_split($number));
echo $number;
exit;
Ну или так (с условиями):
<?php
//© Sutaram. +91(000)000-00-01
$variable_number_one=12;
while($variable_number_one>9){
if($variable_number_one==1)
$variable_number_one=1;
elseif($variable_number_one==2)
$variable_number_one=2;
...
elseif($variable_number_one==11)
$variable_number_one=2;
...
elseif($variable_number_one==56)
$variable_number_one=11;
...
elseif($variable_number_one==N)
...
};
echo $variable_number_one;
exit;
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