从复选框中获取最低值

Question

复选框提供了滑雪胜地的高度。在“lowest”(通过ajax)之后，我希望得到最低的值。做这件事有什么办法？

在接收端，我需要捕获值(作为整数)：

       <?php
            //post

$altitudes = isset($_REQUEST['altitude']) ? $_REQUEST['altitude'] : array();
sort($altitudes, SORT_NUMERIC);


 foreach($altitudes as $value) {
  if $value > 0; $hohe = $value; break;
}

        ?>

<div class="list-group">
    <h3>Altitude</h3>
    <a href="javascript:void(0);" class="list-group-item">
        <input class="item_filter altitude"  name="altitude[]" value="500" type="checkbox"> &nbsp;&nbsp; 500
    </a>
    <a href="javascript:void(0);" class="list-group-item">
        <input class="item_filter altitude"  name="altitude[]" value="1200" type="checkbox"> &nbsp;&nbsp; 1200
    </a>
    <a href="javascript:void(0);" class="list-group-item">
        <input class="item_filter altitude"  name="altitude[]" value="1400" type="checkbox"> &nbsp;&nbsp; 1400
    </a>
    <a href="javascript:void(0);" class="list-group-item">
        <input class="item_filter altitude"  name="altitude[]" value="1800" type="checkbox"> &nbsp;&nbsp; 1800
    </a>
    <a href="javascript:void(0);" class="list-group-item">
        <input class="item_filter altitude"  name="altitude[]" value="2200" type="checkbox"> &nbsp;&nbsp; 2200
    </a>
    <a href="javascript:void(0);" class="list-group-item">
        <input class="item_filter altitude"  name="altitude[]" value="2600" type="checkbox"> &nbsp;&nbsp; 2600
    </a>
    <a href="javascript:void(0);" class="list-group-item">
        <input class="item_filter altitude"  name="altitude[]" value="3000" type="checkbox"> &nbsp;&nbsp; 3000
    </a>
</div>

Answer 1

循环遍历高度数组，获取第一个值并将其赋值为$min_val，然后检查每个后续值。如果下一个值小于$min_val，则将$min_val重新分配为该值。

$altitudes = isset($_POST['altitude']) ? $_POST['altitude'] : array();

if(!empty($altitudes)){
    foreach($altitudes as $value) {
        if(!isset($min_val) || $value < $min_val){
            $min_val = $value;
        } 
    }       
}

$min_val将是您的最低值