In PHP, why is it important to properly close quotation marks in SQL queries to prevent errors in data insertion?

When constructing SQL queries in PHP, it is important to properly close quotation marks to prevent errors in data insertion. Failure to do so can result in syntax errors or SQL injection vulnerabilities. To avoid these issues, always make sure to properly escape and close quotation marks when building SQL queries in PHP. 

// Example of properly closing quotation marks in an SQL query
$name = "John";
$email = "john@example.com";

$sql = "INSERT INTO users (name, email) VALUES ('$name', '$email')";
$result = mysqli_query($conn, $sql);

if ($result) {
    echo "Data inserted successfully";
} else {
    echo "Error: " . $sql . "<br>" . mysqli_error($conn);
}

Keywords

PHP SQL queries quotation marks data insertion errors

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