What is the significance of using double quotes versus single quotes in PHP regex?

Using double quotes versus single quotes in PHP regex can affect the interpretation of special characters within the regex pattern. Double quotes allow for the interpolation of variables, which can be useful when incorporating dynamic values into the regex pattern. However, when using special characters in the regex pattern, it is recommended to use single quotes to avoid conflicts with PHP's string interpolation. 

// Using single quotes to define the regex pattern
$pattern = '/\d{3}-\d{3}-\d{4}/';

// Using double quotes to define the regex pattern with variable interpolation
$phone_number = '123-456-7890';
$pattern = "/$phone_number/";

Keywords

double quotes single quotes PHP regex significance syntax

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