How can PHP developers ensure that their online text editor is secure and prevents malicious code injection?

To ensure that an online text editor is secure and prevents malicious code injection, PHP developers can implement input validation and output escaping techniques. Input validation involves checking and sanitizing user input to ensure it meets expected criteria, while output escaping involves encoding user input before displaying it to prevent script injection attacks. 

// Input validation to prevent malicious code injection
$input = $_POST['user_input'];
$clean_input = htmlspecialchars($input, ENT_QUOTES, 'UTF-8');

// Output escaping to prevent script injection attacks
echo htmlentities($clean_input, ENT_QUOTES, 'UTF-8');

Keywords

Cross-site scripting SQL injection htmlspecialchars htmlentities secure coding practices

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