Les fonctions MySQL peuvent-elles être aveuglément remplacées par leurs homologues MySQLi ?

Can MySQL Functions Be Directly Swapped with MySQLi?

Question:

In PHP, the use of mysql_ functions has been deprecated and later removed. Can these functions be blindly replaced with their mysqli_ counterparts throughout a project, such as replacing mysql_query() with mysqli_query()?

Answer:

No, the functions are not directly interchangeable.

While MySQLi provides similar functionality to mysql_, the two sets of functions are structurally different. Simply replacing mysql_ with mysqli_ will not always work and may introduce errors.

Recommended Approach:

To safely migrate your codebase, consider the following steps:

1. Error Reporting:

Enable error reporting for mysqli_ to identify any potential issues.

mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);

2. Connection Establishment:

Create a new connection function that saves the connection as a PHP variable, using mysqli_.

$mysqli = new mysqli($host, $username, $password, $database);

3. Query Execution:

Use the mysqli_query() function with the connection variable as the first argument.

<code class="php">$result = mysqli_query($mysqli, $sql);</code>

4. Result Fetching:

Retrieve the result using mysqli_fetch_assoc() in procedural code or the object-oriented method.

<code class="php">while ($row = mysqli_fetch_assoc($result)) {
    // ...
}</code>

5. Connection Closure:

Close the connection using mysqli_close() (procedural) or the object-oriented method.

<code class="php">mysqli_close($mysqli);
$mysqli->close();</code>

6. Function Conversion:

Convert all relevant functions that rely on database connections or result sets to their mysqli_ equivalents.

Remember, it's prudent to review the mysqli_ documentation for more detailed information and to verify compatibility with your specific code.

Ce qui précède est le contenu détaillé de. pour plus d'informations, suivez d'autres articles connexes sur le site Web de PHP en chinois!