如何使用php对带有子数组的数组中的一个值进行乘法和舍入?
如何使用PHP迭代和修改数组的一个值? 我有以下代码:如何使用php对带有子数组的数组中的一个值进行乘法和舍入?,php,arrays,key-value,rounding,multiplication,Php,Arrays,Key Value,Rounding,Multiplication,如何使用PHP迭代和修改数组的一个值? 我有以下代码: <?php // That's the output that I receive from an Java program. $freeTextOutput = " 42631673:0.5585319618827993; 39830245:0.4512246398531659; 9543481:0.4486841314390102; 45349208:
<?php
// That's the output that I receive from an Java program.
$freeTextOutput = "
42631673:0.5585319618827993;
39830245:0.4512246398531659;
9543481:0.4486841314390102;
45349208:0.4478453543900579;
3543584:0.3855027425164259;
29266117:0.37859229789438587;
25948743:0.3762908775963289;
44167053:0.3756673145038688;
6355749:0.3702819135046792;
6322651:0.36883803217397765;";
// Transform output into an array.
$freeTextOutputArray = explode(";", $freeTextOutput, -1);
然后我分解它,所以我有一个带有子数组的数组:
// Transform values of the first array into subarrays.
foreach ($freeTextOutputArray as $value) {
$freeTextOutputArrayWithSubArrays[] = explode(":", $value);
}
结果是:
Array (
[0] => Array (
[0] => 42631673 [1] => 0.5585319618827993
)
[1] => Array (
[0] => 39830245 [1] => 0.4512246398531659
)
etc...
[9] => Array (
[0] => 6322651 [1] => 0.36883803217397765
)
)
现在我想把子数组的key[1]的值乘以1000,然后四舍五入。我就这样试过:
foreach ($freeTextOutputArrayWithSubArrays as $value) {
foreach ($value as $wert) {
$roundedIndex[] = round($wert * 1000);
}
}
但后来,所有的东西都被放大了,子阵列也消失了:
Array (
[0] => 42631673000
[1] => 559
[2] => 39830245000
[3] => 451
etc...
[18] => 6322651000
[19] => 369
)
那么我要做什么才能得到下面的结果呢
Array (
[0] => Array (
[0] => 42631673 [1] => 558
)
[1] => Array (
[0] => 39830245 [1] => 451
)
etc...
[9] => Array (
[0] => 6322651 [1] => 368
)
)
提前谢谢你
foreach ($freeTextOutputArrayWithSubArrays as $value) {
$roundedIndex[] = array($value[0],round($value[1] * 1000));
}
结果是在var_dump($roundedIndex)之后
感谢您提供的解决方案,它非常完美。但我不明白为什么“内部”foreach不起作用。我想我应该用它来迭代子数组的值,但是你证明了这是没有必要的。
foreach ($freeTextOutputArrayWithSubArrays as $value) {
$roundedIndex[] = array($value[0],round($value[1] * 1000));
}
array
0 =>
array
0 => string '
42631673' (length=18)
1 => float 559
1 =>
array
0 => string '
39830245' (length=18)
1 => float 451
2 =>
array
0 => string '
9543481' (length=17)
1 => float 449
3 =>
array
0 => string '
45349208' (length=18)
1 => float 448
4 =>
array
0 => string '
3543584' (length=17)
1 => float 386
<?php
// That's the output that I receive from an Java program.
$freeTextOutput = "
42631673:0.5585319618827993;
39830245:0.4512246398531659;
9543481:0.4486841314390102;
45349208:0.4478453543900579;
3543584:0.3855027425164259;
29266117:0.37859229789438587;
25948743:0.3762908775963289;
44167053:0.3756673145038688;
6355749:0.3702819135046792;
6322651:0.36883803217397765;";
// Transform output into an array.
$freeTextOutputArray = explode(";", $freeTextOutput, -1);
foreach ($freeTextOutputArray as $value) {
$freeTextOutputArrayWithSubArrays[] = explode(":", $value);
}
foreach ($freeTextOutputArrayWithSubArrays as $key => $value) {
$freeTextOutputArrayWithSubArrays[$key][1] = round($freeTextOutputArrayWithSubArrays[$key][1] * 1000);
}
print_r($freeTextOutputArrayWithSubArrays);