What is the potential impact of missing quotation marks in PHP code when concatenating strings for SQL queries?

Missing quotation marks in PHP code when concatenating strings for SQL queries can lead to syntax errors or unexpected behavior in the query execution. To solve this issue, it is important to ensure that string values are properly enclosed in quotation marks to avoid any SQL injection vulnerabilities or errors in the query syntax. 

// Example of concatenating strings with proper quotation marks for SQL queries
$userInput = "John";
$sql = "SELECT * FROM users WHERE username = '" . $userInput . "'";

Keywords

PHP SQL queries concatenating strings quotation marks potential impact

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