php - 使用foreach循环如何在使用php中添加vlue的总和

Question

如何使用 foreach 循环添加每个增量值我的输出应该像

   1
   1+2 = 3
   1+2+3 = 5

我的代码休闲为

   <?php
    $value = array('1',2',3);
    foreach ($value as $prin) 
    {
    echo prin;
    }
    ?>

写的是真的吗？？

Answer 1

那么你正在寻找这个：

<?php

$values = array(1,2,3);

$values_count = count($values);

for ($i=0; $i < $values_count; $i++) { // loop $values_count number of times
    $str = ''; // this string will store the part before = in each line
    $total = 0; // initialize total to 0 after printing every line

    for ($j = 0; $j <= $i; $j++) { // loop across the first $i values in the $values array
        $str .= $values[$j] . " + "; // append to the string
        $total += $values[$j]; // add to total
    }

    $str = substr($str, 0, -3); // remove the final ' + ' from the string
    echo $str . ' = ' . $total . "\n\n"; // print line
}

Answer 2

很久没用php了

<?php
foreach($value as $prin)
{
    $res = 0;
    for($i = 1; $i <= $prin; i++)
    {
        $res = $res + i;
        echo $i;
        if($i != $prin) echo "+"
    }
    echo "=" + res;
}
?>

Answer 3

我认为您正在寻找这样的东西：

<?php
    $value = array(1,2,3);
    $sum = 0;

    foreach ($value as $prin) 
        $sum += $prin;

    echo $sum;
?>

Answer 4

一个简单的解决方案是：

<?php
   $output = "";
   $total = 0;

   $values = array(1,2,3);
   foreach ($values as $val) 
   {
      $total += $val;
      $output += $val . " + ";
      echo $output . " = " . $total;
   }
?>