How can using single or double quotes affect variable values in PHP forms?

Using single or double quotes can affect variable values in PHP forms because variables inside double quotes will be parsed and their values will be inserted, while variables inside single quotes will be treated as literal strings. To ensure the correct value of variables is inserted into the form, it is recommended to use double quotes when echoing variables in PHP forms. 

// Incorrect way using single quotes
$name = 'John';
echo '<input type="text" name="name" value="' . $name . '">';

// Correct way using double quotes
$name = 'John';
echo "<input type='text' name='name' value='$name'>";

Keywords

PHP single quotes double quotes variable values forms

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