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如何循环遍历foreach直到找到X,如果找不到,则查找Y

foreach search if-statement arrays php

Josh · 技术社区 · 8 年前

抱歉,如果这是重复的,我不知道要搜索什么才能找到答案。

我有一个foreach循环,在这个循环中,我试图测试(a==B)。一旦发现,我就打破了这个循环。如果(A!=B)在迭代中,我测试If(X==Y)。

我的问题是,如果首先发现(X==Y)为真,那么在测试if(A==B)之前,循环就会中断。

有没有更好的方法来完成这项任务?

$variable[1] = ['A' => 'n', 'X' => 'n'];
$variable[2] = ['A' => 'n', 'X' => 'Y'];
$variable[3] = ['A' => 'B', 'X' => 'n'];

$test = 'B';

foreach ($variable as $value) {

    if($value['A'] == $test || $value['X'] == "Y") {
        echo 'The results: ' . $value['A'];
        break;
    }

}

// The results for $variable[2] are returned. I need the results for $variable[3] to be returned.

我确实有一个else语句工作得很好,但我不得不复制输出。

提前谢谢!

上面的代码是我正在研究的简化版本。这是我正在实际工作的代码。

foreach ($product_xml->products->product_styles as $style => $attribute) {
    if(isset($_GET['color']) && $attribute['color'] == $color_selected || $attribute['is_default'] == "1") {
        foreach ($attribute as $value){
            $imgURL = (string)$value['imgurl'];
            $thumburl = (string)$value['thumburl'];
            $thumburl_array[(string)$value['side']] = (string)$value['thumburl'];
            if (in_array($imgURL, $values)){continue;}
            else{
                array_push($values, $imgURL);
                $imgURL = str_replace("REPLACE_DOMAIN_WITH",IDEQ_INKSOFTAPI_URL_SECURE,$imgURL );
                $thumburl = str_replace("REPLACE_DOMAIN_WITH",IDEQ_INKSOFTAPI_URL_SECURE,$thumburl );
                $thumburl = str_replace("150.png","500.png",$thumburl );
                echo '<img src="'.$imgURL.'" class="pic'.$counter.'" title="'.$value['name'].'">';
                $counter++;
            }
        }
        break;
    }
}

4 回复 | 直到 8 年前

Isaac Hildebrandt 8 年前

使用临时变量并移动 echo 至之后 foreach .

$variable[1] = ['A' => 'n', 'X' => 'n'];
$variable[2] = ['A' => 'n', 'X' => 'Y'];
$variable[3] = ['A' => 'B', 'X' => 'n'];

$test = 'B';
$output = null;

foreach ($variable as $value) {

    if($value['A'] == $test) {
        $output = $value['A'];
        break;
    } else if ($output == null && $value['X'] == "Y") {
        $output = $value['X'];
    }
}

echo 'The results: ' . $output;

user1860638 8 年前

下面是我对一个函数的近似:

function search($variable, $test){
    $alternative = null;

    foreach($variable as $value){
        if($value['A'] == $test){
            return $value['A'];
        }
        if($value['X'] == 'Y' && $alternative === null){
            $alternative = $value['A'];
        }
    }

    return $alternative;
}

它将返回A上的第一个重合,如果找不到,则返回X上的第一个重合。

这样你只能循环通过 foreach公司 一旦

Andreas 8 年前

可以使用array_column来隔离数组A或X中的一列,而不是循环。
然后使用in_数组查看是否在数组中找到$test。

$test = 'B';
$test2 = 'Y';

If(in_array($test, array_column($variable, "A"))){
    Echo $test . " Found in A";
}Else if(in_array($test2, array_column($variable, "X"))){
    Echo $test2 . " Found in B";
}else{
    Echo "none found";
}

https://3v4l.org/dv7Yp

-1

Josh 8 年前

根据来自的响应 James Lalor 我找到了这个解决方案。如果有人能听到更好的处理方式,我会更喜欢的!

$counter = 1;
$values = array();
$thumburl_array = array();
$found = false;
$find_default = false;
$style_count = count($product_xml->products->product_styles);

for ($i=0; $i < $style_count; $i++) { 
    if (isset($_GET['color']) && $product_xml->products->product_styles[$i]['color'] == $color_selected) {
        $found = true;
    } elseif (!$found && !$find_default && $i == $style_count - 1) {
        $find_default = true;
        $i = 0;
    }

    if ($find_default && $product_xml->products->product_styles[$i]['is_default'] == '1') {
        $found = true;
    }

    if ($found) {
        foreach ($product_xml->products->product_styles[$i] as $value){
            $imgURL = (string)$value['imgurl'];
            $thumburl = (string)$value['thumburl'];
            $thumburl_array[(string)$value['side']] = (string)$value['thumburl'];
            if (in_array($imgURL, $values)){continue;}
            else{
                array_push($values, $imgURL);
                $imgURL = str_replace("REPLACE_DOMAIN_WITH",IDEQ_INKSOFTAPI_URL_SECURE,$imgURL );
                $thumburl = str_replace("REPLACE_DOMAIN_WITH",IDEQ_INKSOFTAPI_URL_SECURE,$thumburl );
                $thumburl = str_replace("150.png","500.png",$thumburl );
                echo '<img src="'.$imgURL.'" class="pic'.$counter.'" title="'.$value['name'].'">';
                $counter++;
            }
        }
        break;
    }
}

简化版

$variable[] = ['A' => 'n', 'X' => 'n', 'result' => 'do'];
$variable[] = ['A' => 'n', 'X' => 'Y', 'result' => 're'];
$variable[] = ['A' => 'B', 'X' => 'n', 'result' => 'mi'];

$found = false;
$find_default = false;
$count = count($variable);

$test = 'B';

for ($i=0; $i < $count; $i++) { 
    if ($variable[$i]['A'] == $test) {
        $found = true;
    } elseif (!$found && !$find_default && $i == $count - 1) {
        $find_default = true;
        $i = 0;
        continue;
    }

    if ($find_default && $variable[$i]['X'] == 'Y') {
        $found = true;
    }

    if ($found) {
        echo "Resulsts: " . $variable[$i]['result'];
        break;
    }
}

谢谢大家的反馈,非常感谢。干杯