php - 为什么我不能在 PHP 中比较这些数字？

Question

因此，我有一个 if 语句，用于检查 $chosenCourseId 是否等于 $thisCertificateCourseId 或者是否等于 0.

当它与 0 进行比较时，我明白了，但如果 $chosenCourseId 等于任何其他数字，则它与 $thisCertificateCourseId< 不匹配，即使它们是相同的 2740 == 2740。

比较发生在 PHP 代码上，该代码回显到 Ajax 并显示该类(class)的证书数量(两个日期之间)。

问题是，如果我只运行 PHP 代码，它会回显数字本身 $thisCertificateCourseId = 2740 但当我 console.log() 它时，它会返回 NULL。

你能告诉我我做错了什么吗？

PHP 代码:

$certificateCounter = 0;
foreach ($certificates as $certificate) {

    $thisCertificateCourseId = unserialize($certificate['certificate_course_id'])[0];
    $thisCertificateTimestamp = date("Y-m-d", strtotime($certificate['time_stamp']));

if($thisCertificateTimestamp >= $minDate 
    AND $thisCertificateTimestamp <= $maxDate
    AND ($chosenCourseId == $thisCertificateCourseId OR $chosenCourseId == 0)
) {

    $certificateCounter++;

  }

}

PHP 代码到 console.log():

$certificateCounter = 0;
$icounter = 0;
foreach ($certificates as $certificate) {

    $thisCertificateCourseId = unserialize($certificate['certificate_course_id'])[0];
    $thisCertificateTimestamp = date("Y-m-d", strtotime($certificate['time_stamp']));

    $certificateCourseId[$icounter] = $thisCertificateCourseId;
    $icounter++;

}

jQuery 到 console.log():

jQuery.each(data[10], function(index, value) {
    console.log(index + ' -> ' + value);
});

PHP 代码自行运行:

$chosenCourseId = 2740;

$certificateCounter = 0;
foreach ($certificates as $certificate) {

    $thisCertificateCourseId = $certificate['certificate_course_id'];
    $thisCertificateTimestamp = date("Y-m-d", strtotime($certificate['time_stamp']));

    echo 'Raw: ';
    var_dump($thisCertificateCourseId);
    echo "<BR>";
    echo "Unserialized: ";
    var_dump(unserialize($thisCertificateCourseId));
    echo "<BR>";
    echo "[0]: ";
    var_dump(unserialize($thisCertificateCourseId)[0]);
    echo "<BR>";
    echo "Is equal? ";
    var_dump(unserialize($thisCertificateCourseId)[0] == $chosenCourseId);
    echo "<BR><BR>";

}

PHP代码自行运行的结果:

Raw: string(51) "a:3:{i:0;s:4:"1139";i:1;s:4:"2968";i:2;s:4:"2968";}" 
Unserialized: array(3) { [0]=> string(4) "1139" [1]=> string(4) "2968" [2]=> string(4) "2968" } 
[0]: string(4) "1139" 
Is equal? bool(false) 

Raw: string(21) "a:1:{i:0;s:4:"1139";}" 
Unserialized: array(1) { [0]=> string(4) "1139" } 
[0]: string(4) "1139" 
Is equal? bool(false) 

Raw: string(51) "a:3:{i:0;s:4:"2740";i:1;s:4:"2968";i:2;s:4:"2968";}" 
Unserialized: array(3) { [0]=> string(4) "2740" [1]=> string(4) "2968" [2]=> string(4) "2968" } 
[0]: string(4) "2740" 
Is equal? bool(true) 

<小时/>

编辑:

所以我发现变量 $chosenCourseId 和 $thisCertificateCourseId 都是带有 is_string() 的字符串，它返回了我 true。另一方面，is_numeric() 对两个变量都返回了 false。

当$chosenCourseId和$thisCertificateCourseId为2740时: strcmp($chosenCourseId, $thisCertificateCourseId) 返回我-47。

此语句永远不会触发(我知道 2740 是数字/字符串之一):

if($thisCertificateCourseId == 2740 OR $thisCertificateCourseId == '2740') {
    $certificateCounter++;
}

如果我尝试下面的代码，它会起作用，但我需要知道该证书是否来自用户选择的类(class)。

if(true){
    $certificateCounter++;
}

关于如何解决这个问题有什么想法吗？

<小时/>

filterDashboard() 返回代码:

return array(
    $courseList,                            // 0
    $unitList,                              // 1
    $certificatesList,              // 2
    $quizScoreList,                     // 3
    $authorList,                            // 4
    $authorsPosition,                   // 5
    $authorsPercent,                    // 6
    $unitSeconds,                           // 7
    $totalSecondsConverted,     // 8
    $certificateCounter,            // 9
    $certificateCourseId,           // 10
);

echo json_encode(filterDashboard($units, $certificates, $quizzes, $minDate, $maxDate, $authorsId, $courseOf, $chosenCourseId, $chosenUnitId));

jQuery.each(data, function(index, value) {
    console.log(index + ' -> ' + value);
});

返回:

0 -> [object Object],[object Object]
1 -> [object Object],[object Object],[object Object],[object Object]
2 -> 
3 -> 
4 -> [object Object],[object Object],[object Object]
5 -> 1
6 -> 100,00
7 -> [object Object]
8 -> 34min 3s
9 -> 0
10 -> a:3:{i:0;s:4:\"1139\";i:1;s:4:\"2968\";i:2;s:4:\"2968\";},a:1:{i:0;s:4:\"1139\";},a:3:{i:0;s:4:\"2740\";i:1;s:4:\"2968\";i:2;s:4:\"2968\";},a:3:{i:0;s:4:\"2968\";i:1;s:4:\"2968\";i:2;s:4:\"2968\";},a:2:{i:0;s:4:\"2968\";i:1;s:4:\"2968\";}

Answer 1

我明白了。 这里的问题是因为我通过 ajax/json 传递一个数组，并且在 PHP 端它向序列化数组添加了斜杠。

在反序列化字符串之前，我使用 stripcslashes() 解决了这个问题。

遵循工作代码:

$certificateCounter = 0;
foreach ($certificates as $certificate) {

    $thisCertificateCourseId = unserialize(stripcslashes($certificate['certificate_course_id']))[0];
    $thisCertificateTimestamp = date("Y-m-d", strtotime($certificate['time_stamp']));

    if($thisCertificateTimestamp >= $minDate
        AND $thisCertificateTimestamp <= $maxDate
        AND ($chosenCourseId == $thisCertificateCourseId OR $chosenCourseId == 0)
    ) {
        $certificateCounter++;
    }

}