php 数组，相邻的值进行计算，怎么处理？

Question

$con = array('100','99','80','50','120','110');

如何获得相邻的值增长率

比如 99-100/100，80-99/100，50-80/100，120-50/100，110-120/100

 

Answer 1

$con = array('100','99','80','50','120','110');
$count = count($con);
for ($i=0; $i<$count; $i++){
    $z = ($con[$i+1]-$con[$i])/100;
    echo '<br/>';
    echo $z;
}

结果