Web Reference: learn-php.org is a free interactive PHP tutorial for people who want to learn PHP, fast. PHP Strings A string is a sequence of characters, like "Hello world!". In PHP, strings are surrounded by either double quotes, or single quotes. There are two string operators. The first is the concatenation operator ('.'), which returns the concatenation of its right and left arguments. The second is the concatenating assignment operator ('.= '), which appends the argument on the right side to the argument on the left side. Please read Assignment Operators for more information.
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