[theme-reviewers] usage of single quotes and double quotes in PHP

[Satish Gandham]

Question here is not about consistency,

We use single quotes when we are not evaluating anything within the string.

echo "Hello World!" uses more cpu resources than echo 'Hello World'.


I want know which of these two is better.

<?php
echo "This is a string with variable $test_variable"
 ?>

 <?php
  echo 'This is another variant of the above statement '.$test_variable
 ?>
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