How to solve the error when tp5 uses php7.2.15

TP5 is a high-performance development framework based on PHP, which is widely used in various web development projects. However, after the latest version was released, some users encountered a problem, that is, an error occurred during the process of supporting PHP7.2.15 on TP5. This article will delve into the causes of this problem and provide solutions.

1. Background of the problem

When using the TP5 framework, many users have upgraded the PHP version. Among them, PHP 7.2.15 version is considered to be a very stable version and can provide better performance and security. However, when some users tried to use PHP 7.2.15 version on TP5, they encountered errors.

The specific error message is as follows:

PHP Fatal error: Cannot use isset() on the result of a function call (you can use "null !== func()" instead) in /path/to/tp5/framework/library/think/db/BaseQuery.php on line xxx

2. Cause of the problem

According to the above error message, it can be found that the problem lies in the code of the TP5 framework middle. Specifically, an error occurred in BaseQuery.php, the database query statement constructor of TP5. It can be seen from the error message that the isset() function is used in the BaseQuery.php file, and this may trigger some new features of the PHP 7.2.15 version and cause the error to occur.

Specifically, PHP version 7.2.15 introduces a new feature that does not allow the isset() function to be used directly on the return value of the function. This feature is implemented to avoid some potential security issues and syntax errors. In TP5, this situation of using isset() on the return value occurred, which caused the program to crash.

3. Solution

In view of the above problems, the following solutions can be adopted to solve this problem:

1. Upgrade TP5 version

According to the information provided by the TP5 official forum, if the above problems occur during Upgrade, it is recommended to upgrade from 5.0.10 to the latest version. The latest version of TP5 has fixed this problem and can support the use of PHP 7.2.15.

2. Manually modify the code

In addition, you can also manually modify the code to solve this problem. The specific modification method is as follows:

Enter the file: tp5/framework/library/think/db/BaseQuery.php

Find the following code:

if(is_null($value)) {
    $condition .= $field . ' IS NULL '; // null值处理
} elseif(is_array($value)) {
    if(is_string($key)) {
        $condition .= $field . ' ' . $key . ' (' . implode(',', $this->parseValue($value)) . ')';
    } else {
        $condition .= $this->buildWhere($value, $field, $type, $logic, $condition);
    }
} elseif(is_string($key)) {
    $condition .= $field . ' ' . $key . ' ' . $this->parseValue($value);
} else {
    $condition .= $field . ' = ' . $this->parseValue($value);
}

Modify to:

if(is_null($value)) {
    $condition .= $field . ' IS NULL ';
} elseif(is_array($value)) {
    if(is_string($key)) {
        if (empty($value)) {
            $condition .= '1=0';
        } else {
            $condition .= $field . ' ' . $key . ' (' . implode(',', $this->parseValue($value)) . ')';
        }
    } else {
        $condition .= $this->buildWhere($value, $field, $type, $logic, $condition);
    }
} elseif(is_string($key)) {
    if ($value === '' || is_array($value)) {
        $condition .= '1=0';
    } else {
        $condition .= $field . ' ' . $key . ' ' . $this->parseValue($value);
    }
} else {
    $condition .= $field . ' = ' . $this->parseValue($value);
}

Note that if you choose to modify the code manually, you need to test the modified code to ensure its correctness. Also, to avoid future problems, it's a good idea to keep your TP5 framework version up to date.

4. Summary

Through the analysis of this article, we can see that the error report supporting PHP7.2.15 does not come from PHP itself, but appears in the TP5 framework code. In development based on TP5, if you encounter such a problem, you only need to adopt the above solutions. At the same time, we also need to be aware that when using a new version of PHP, the compatibility with the TP5 framework also needs to be tested and debugged accordingly to ensure the stability and reliability of the entire system.

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