How can escaping sequences affect the formatting of emails in PHP?

Escaping sequences can affect the formatting of emails in PHP by causing unintended characters to be displayed or interpreted incorrectly. To solve this issue, we can use the `htmlspecialchars()` function to encode special characters in the email content before sending it. 

$email_content = "Hello, <strong>John</strong>! How are you?";
$encoded_content = htmlspecialchars($email_content);

// Send email with $encoded_content as the email body

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escaping sequences formatting emails PHP error types

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