How can using different types of quotation marks impact the execution of MySQL queries in PHP?

Using different types of quotation marks in MySQL queries in PHP can impact the execution by causing syntax errors or unexpected behavior. To avoid this issue, it is recommended to consistently use single quotes for enclosing string values in MySQL queries. This ensures that the query is properly formatted and executed without errors. 

// Incorrect usage of double quotes for string value in MySQL query
$query = "SELECT * FROM users WHERE username = '$username'";

// Corrected query using single quotes for string value
$query = "SELECT * FROM users WHERE username = '$username'";

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PHP MySQL queries quotation marks execution impact

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