为什么我不能在 PHP 中比较这些数字？

Question

所以，我有一个 if statement 检查 $chosenCourseId 是否等于 $thisCertificateCourseId 或者它是否等于 0.

当它与 0 比较时我明白了，但是如果 $chosenCourseId 等于任何其他数字，它与 $thisCertificateCourseId 不匹配，即使它们是相同 2740 == 2740.

比较发生在 PHP 代码上，该代码与 Ajax 相呼应并显示该课程的证书数量（两个日期之间）。

问题是，如果我运行只有 PHP 代码，它会回显数字本身 $thisCertificateCourseId = 2740 但是当我 console.log() 它时，它 returns 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 代码为 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 代码运行ning 本身：

$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 代码运行本身的结果：

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)

编辑：

所以我发现变量 $chosenCourseId 和 $thisCertificateCourseId 都是带有 is_string() 的字符串，返回了我 true。另一方面，is_numeric() 在两个变量上都返回了我 false。

当$chosenCourseId和$thisCertificateCourseId为2740时： strcmp($chosenCourseId, $thisCertificateCourseId) returns 我 -47.

这条语句永远不会触发（我知道2740是numbers/strings之一）：

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

如果我尝试下面的代码，它可以工作，但我需要知道该证书是否来自用户选择的课程。

if(true){
    $certificateCounter++;
}

关于如何解决这个问题有什么想法吗？

filterDashboard() returns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);
});

returns:

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。这里的事情是因为我通过 ajax/json 传递一个数组，并且在 PHP 结束时它向序列化数组添加斜杠。

我在反序列化字符串之前使用 stripcslashes() 解决了它。

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++;
    }

}

为什么我不能在 PHP 中比较这些数字？

Why can't I compare this numbers in PHP?

php

jquery

json

ajax

comparison