PHP 7.2 不能在 eval 中使用字符串偏移作为数组

Question

The code was working in php 7.0. I am getting error after moved to 7.2 version. I need help in understand this. I have an $map and $tempArray print_r value of $locMap is given below

Array
    (
        [1] => Array
            (
                [ID] => 1
                [LEVEL] => 1
                [NAME] => Operations1
                [CLASS] => ["e2"]["00"]

            )

        [2] => Array
            (
                [ID] => 2
                [LEVEL] => 1
                [NAME] => POperations2
                [CLASS] => ["e2"]["01"]

            )

        [26] => Array
            (
                [ID] => 26
                [LEVEL] => 2
                [NAME] => Operations3
                [CLASS] => ["e2"]["01"]["e2"]["00"]

            )
    )

print_r value of $tempArray is as below

Array
    (
        [account] => Array
            (
                [0] => Array
                    (
                        [id] => 1000
                        [name] => Homes
                        [level] => 
                        [rno] => 9
                    )

            )

    )

Looping this $map as below

foreach ($map $rec=>$det) {
     $dummyArray = array();
     $dummyArray['id'] = $det['ID'];
     $dummyArray['CLASS'] = $det['CLASS'];
     eval("\$tempArray['account'][0]".$det["CLASS"]." = \$dummyArray;");
}

Error: Cannot use string offset as an array in *************: eval()'d code:1

Inside eval function, "\$tempArray['account'][0]" is a string and is concatenating with the string again. Why do I get the error in this case? Help me understand this and how do I fix this issue?

Answer 1

I believe the problem comes your concatenation of "\$tempArray['account'][0]".$det["CLASS"]." = \$dummyArray;" . If you output the string, you can see what is evaluated. Most probably, you forgot [] around $det["CLASS"]. In your case, the first part might be a string, not an array.

By the way, I am not sure to understand what you want to do but I am not sure you use the easiest way.

I do not understand why it worked with php7.0.