What is the purpose of the reversal_num.php file?

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php 0); var_dump($reversed_num);}?>

reversal_num.php

function reversing_num(){ $num = 765432; //需要倒转的数字 $rebmnu = 0; $temp = $num ; do{ $rebmnu = $rebmnu*10 + $temp % 10; $temp = $temp/10; } while($temp>0); var_dump($rebmnu); } // 234567