In what situations would it be appropriate to use mysql_real_escape_string instead of mysql_fetch_array in PHP?

When dealing with user input that will be inserted into a database query, it is important to use mysql_real_escape_string to escape special characters and prevent SQL injection attacks. This function helps to sanitize the input and make it safe for use in SQL queries. On the other hand, mysql_fetch_array is used to retrieve a row of data from a result set, and it should be used after the input has been properly sanitized to fetch and display the data. 

// Using mysql_real_escape_string to sanitize user input before inserting into a database query
$user_input = $_POST['user_input'];
$safe_input = mysql_real_escape_string($user_input);

// Query to insert sanitized input into the database
$query = "INSERT INTO table_name (column_name) VALUES ('$safe_input')";
$result = mysql_query($query);

// Using mysql_fetch_array to retrieve and display data from the database
$query = "SELECT * FROM table_name";
$result = mysql_query($query);

while ($row = mysql_fetch_array($result)) {
    echo $row['column_name'];
}

Keywords

mysql_real_escape_string mysql_fetch_array PHP security SQL injection

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