Using Single and Double Quotes in PHP

Example using double quotes: Hello, John. Welcome to the site.

Example using single quotes: Hello, $name. Welcome to the site.

Explanation

In PHP, single quotes ('') and double quotes ("") behave differently. Double quotes allow for variable interpolation, meaning that variables within double quotes will be parsed and their values inserted into the string. Single quotes, on the other hand, treat the content as a plain string and do not parse variables. This makes single quotes slightly faster in performance, but double quotes are more flexible when variable interpolation is needed.

Source Code

<?php
// Example using double quotes
$name = "John";
$example_double_quotes = "Hello, \$name. Welcome to the site.";
echo "<p>Example using double quotes: $example_double_quotes</p>";

// Example using single quotes
$example_single_quotes = 'Hello, $name. Welcome to the site.';
echo "<p>Example using single quotes: $example_single_quotes</p>";
?>