Question

我不知道为什么，但是一些空白值仍会通过我的if语句进行过滤...当我回显一个json编码版本时，某些值有“键”但“值”不包含任何东西。有什么想法吗？

function graph_fees($competitors, $fee_graph_data){

        foreach ($competitors as $competitor) {
            if (!empty($competitor->minSingleCareFee)) {
                $fee_graph_data[$competitor->Home_name] = $competitor->minSingleCareFee;
            } 
        }
        return $fee_graph_data;     
    }


$mm_fees = graph_fees($competitors, $fee_graph_data);
echo json_encode($mm_fees);

Answer 1

在创建数据时可能会出现空白，在检查之前修剪（）它。

<?php 
function graph_fees($competitors, $fee_graph_data = array())
{
    foreach ($competitors as $competitor) {
        $competitor->Home_name = trim($competitor->Home_name);
        $competitor->minSingleCareFee = trim($competitor->minSingleCareFee);

        if (!empty($competitor->minSingleCareFee) && !empty($competitor->Home_name)) {
            $fee_graph_data[$competitor->Home_name] = $competitor->minSingleCareFee;
        }
    }
    return $fee_graph_data;
}


$mm_fees = graph_fees($competitors, $fee_graph_data);
echo json_encode($mm_fees);
?>

Answer 2

foreach ($competitors as $competitor) {
        $myValue = trim($competitor->minSingleCareFee);
        if (!empty($myValue)) {
            $fee_graph_data[$competitor->Home_name] = $competitor->minSingleCareFee;
        } 
    }

Answer 3

包含空格的字符串不为空。截至php doc：

以下内容被认为是空的：

"" (an empty string)
0 (0 as an integer)
0.0 (0 as a float)
"0" (0 as a string)
NULL
FALSE
array() (an empty array)
$var; (a variable declared, but without a value)

因此，如果您的if中出现问题，$competitor->minSingleCareFee确实包含某些内容。

尝试

if ( isset($competitor->minSingleCareFee) 
             && trim($competitor->minSingleCareFee) != false ) {

会跳过" "或"\n"

等值

php如果语句不能正常工作

3 个答案: