Question

How to truncate a number from left in PHP

Answer 1

function truncate_left($num) {
    $total = floor(log10($num)); // total - 1 = 3
    
    $first_digit = (int)($num / pow(10, $total));

    return $num - $first_digit * pow(10, $total);
}
        
$num = 7483;

echo truncate_left($num);




/*
run:
       
483
       
*/

 

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