PHP foreach循环中的数组范围

时间:2012-07-02 19:13:39

标签: php variables scope textarea

我正在学习PHP,并且一直在为如何正确编写代码而烦恼。我有一个textarea接受用户输入,这是几行坐标(PT#Northing Easting)用空格分隔。

我将表单传递给php脚本来处理它。

我可以得到一个foreach循环来完全按照我想要的方式执行,但只对foreach循环本地化,变量不会传递到循环外部。

我知道这是一个全局变量范围问题,对于我的生活,我无法解决这个问题......

下面是我的PHP代码,我遗漏了HTML表单,我对它没有任何问题,并且知道textarea正在正确传递。

**Sample data that I am inputing:
1 728258.24000 774337.29700
2 728232.15735 774277.54650
3 728326.39614 774216.82428**

<?php

$i = 0;
$j = 0;

//The code below explodes my textarea into a string array
//of separated lines.
$textArea = explode("\r", $_POST['textArea']);
$textNum = array();

//The code below works internally, but the values remain here
//I wanted to get them to the variables below so I can do work
//to them.
foreach ($textArea as $textRows) {

    //The code below explode the lines into elements separated by a space
    $textRow = explode(" ", $textRows);
    foreach ($textRow as $textItem) {
    $textNum[i][j] = $textItem;

    //The code below works within a local context
    echo "(" . $i . " " . $j . ")" . $textNum[i][j] . "</br>";
    $j++;
    }
    $i++;
    $j = 0;
}

//The code below is not receiving values from the foreach loop
//I know this has something to do with the variable scope
//I must be way off in my approach any help would be appreciated!
echo "</br>";
echo "</br> 0 0 " . $textNum[0][0];
echo "</br> 0 1 " . $textNum[0][1];
echo "</br> 0 2 " . $textNum[0][2];
echo "</br> 1 0 " . $textNum[1][0];
echo "</br> 1 1 " . $textNum[1][1];
echo "</br> 1 2 " . $textNum[1][2];
echo "</br> 2 0 " . $textNum[2][0];
echo "</br> 2 1 " . $textNum[2][1];
echo "</br> 2 2 " . $textNum[2][2];
echo "</br> 3 0 " . $textNum[3][0];
echo "</br> 3 1 " . $textNum[3][1];
echo "</br> 3 2 " . $textNum[3][2];
?>

我希望我已经解释得很好,并感谢我能得到的任何帮助!谢谢!

2 个答案:

答案 0 :(得分:2)

第二次循环出错:

$textNum[i][j] = $textItem;

必须是:

$textNum[$i][$j] = $textItem;

答案 1 :(得分:0)

您需要在变量之前添加$,即$textNum[$i][$j]而不是$textNum[i][j],最好初始化$i$j并设置它们在0循环之前到foreach