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English
In PHP, there is a clear difference between single and double quotes, mainly in how they parse strings. Single quotes only output the literal string without parsing variables or escape sequences, while double quotes parse variables and handle escape sequences, as well as allow embedding double quotes. Choosing the correct quote type can improve both the readability and performance of your code.
Single quotes (') do not parse variables, they just output the literal string.
Double quotes (") parse variables and insert their values into the string.
Single quotes: do not support escape sequences, output raw characters.
Double quotes: support escape sequences and convert them to their respective special characters.
Single quotes: if you need to include a single quote in the string, it must be escaped with a backslash.
Double quotes: can directly include double quotes without escaping them.
$name = 'John Doe';
// Output John Doe
echo "$name";
// Output $name
echo '$name';
// Output John Doe is here
echo "$name is here";
// Output Apostrophe is written as '"
echo "Apostrophe is written as '";
Once you understand the differences between single and double quotes in PHP, you can choose them according to your needs. For simple strings that don't require variable parsing, using single quotes can improve performance. On the other hand, when dealing with variable parsing, escape sequences, or special characters, double quotes are more convenient.
