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What are the differences between using a comma and a period for concatenation in PHP when sending emails?

When concatenating strings in PHP to send emails, using a comma will automatically add a space after each concatenated string, while using a period will concatenate the strings without adding any additional characters. This can be important when composing email content as extra spaces or characters can affect the formatting or readability of the email.

php 
// Using a comma for concatenation with spaces
$emailContent = "Hello," . $name . ",\n\nThank you for your inquiry.";

// Using a period for concatenation without additional characters
$emailContent = "Hello, " . $name . ",\n\nThank you for your inquiry.";

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