<ul><li>Single quotes (') and double quotes (") in PHP serve the same primary purpose of creating strings.</li><li>Single quotes treat everything inside them literally, with only two exceptions: \ to escape a single quote and \ to escape a backslash.</li><li>Double quotes process several escape sequences and parse variables and expressions inside the string.</li><li>When it comes to performance, the difference between single quotes and double quotes is minimal in modern PHP versions.</li></ul>

Single Quotes and Double Quotes : String Interpolation and Performance

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