Why Does PHP 5.2.17 Throw an \"Call to undefined method mysqli_result::fetch_all()\" Error?

PHP MySQLi fetch_all() Function: Error and Troubleshooting

In PHP, the MySQLi extension provides a number of functions for interacting with MySQL databases. One such function is fetch_all(), which retrieves all result rows as an associative array. However, when using PHP 5.2.17, developers may encounter an error: "Call to undefined method mysqli_result::fetch_all()".

Error Explanation

PHP version 5.2.17 does not support the fetch_all() function. This function was introduced in PHP 5.3.0, so it is not available in older versions.

Solution

To resolve this issue, you can use the fetch_assoc() function instead. This function retrieves a single row from the result as an associative array. You can loop through the result using the while loop to get all the rows:

<code class="php">while ($row = $result->fetch_assoc()) {
    // Do what you need with the row.
}</code>

Alternative Method

If you need to get all the rows in a single associative array, you can use the following workaround:

<code class="php">$rows = [];
while ($row = $result->fetch_assoc()) {
    $rows[] = $row;
}</code>

This code loops through the result and adds each row to the $rows array. The resulting array will contain all the rows from the result.

Conclusion

Remember to check the compatibility of PHP functions with your specific PHP version. If a function is not available, there may be alternative methods or workarounds to achieve the desired functionality.

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