Php strpos没有按预期工作 [英] Php strpos not working as expected

问题描述

这让我的眼睛现在变得疯狂。它应该工作，但事实并非如此。我将用户从多选选择中选择的值（县名）存储在逗号分隔的字符串中。然后，当表单被提交并被拒绝时，我正在使用该字符串来选择之前选择的那些。



我尝试过：



这是我的测试代码：

<？php 
 echo'上一个选择：'。$ saved_counties; 
 echo'< br />< br />所有县的名单：'; 
 foreach（$县为$ one_county）：
 echo'< br />'.$one_county['County']; 
 if（strpos（$ saved_counties，$ one_county ['County']））{
 echo'（**** IN PREVOUS SELECTION ***）'; 
} 
 endforeach; 
？> 

当我运行代码时，这就是我得到的：



上一个选择：Baraga，Barry，Bay



所有县的列表：

Alcona

Alger
Allegan

Alpena

Antrim

Arenac

Baraga

Barry（****在Prevous SELECTION ***）

Bay（****在Prevous SELECTION ***）

Benzie

Berrien

分行

Calhoun

Cass

Charlevoix

Cheboygan
Chippewa

Clare

Clinton

Crawford

Delta

Dickinson

Eaton

Emmet



为什么跳过Baraga？我选择哪个组无关紧要。它总是跳过foreach代码中的第一个。我试过了：

 strpos（$ saved_counties，$ one_county ['County']）> = 0 

那个结果相同。



我也试过：

 strpos（$ saved_counties，$ one_county ['County' ]）> 0 

最终重新选择了所有这些。



$县是一个存储所有83密歇根州的阵列县。 $ saved_counties只是一个逗号分隔的字符串，用于存储用户以前的选择。

解决方案

saved_counties;
echo'< br />< br />所有县的名单：';
foreach（

县作为

one_county）：
echo'< br />'.<< blockquote >

This is making my eyes go nuts right now. It should work but it's not. I'm storing the values (county names) the user chose from a multiselect select in a comma delimited string. Then when the form is submitted and rejected I'm using that string to "select" the ones that were previously selected.

What I have tried:

Here's my test code:

<?php 
    echo 'Previous selection: '.$saved_counties;
    echo '<br /><br />List of all counties:';
    foreach ($counties as $one_county):
        echo '<br />'.$one_county['County'];
        if (strpos($saved_counties, $one_county['County'])) {
            echo ' (**** IN PREVOUS SELECTION ***)';
        }
    endforeach;
?>

When I run the code, this is what I get:

Previous selection: Baraga,Barry,Bay

List of all counties:
Alcona
Alger
Allegan
Alpena
Antrim
Arenac
Baraga
Barry (**** IN PREVOUS SELECTION ***)
Bay (**** IN PREVOUS SELECTION ***)
Benzie
Berrien
Branch
Calhoun
Cass
Charlevoix
Cheboygan
Chippewa
Clare
Clinton
Crawford
Delta
Dickinson
Eaton
Emmet

Why is it skipping "Baraga"? It doesn't matter which group I select. It always skips the first one in the "foreach" code. I tried:

strpos($saved_counties, $one_county['County']) >= 0

That rendered the same results.

I also tried:

strpos($saved_counties, $one_county['County']) > 0

That ended up reselecting ALL of them.

$counties is an array that stores ALL 83 michigan counties. $saved_counties is just a comma delimited string that stores the user's previous selection.

解决方案

saved_counties; echo '<br /><br />List of all counties:'; foreach (

counties as

one_county): echo '<br />'.

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