A string is a series of letters, in which a letter resembles a byte. This means that PHP only supports a 256-character set
A string literal can be specified in four different ways:
- single quoted
- double quoted
- heredoc syntax
- nowdoc syntax
The simplest way to specify a string is to enclose it in single quotes (the character ').
<?php echo 'this is a simple string'; ?>
If the string is enclosed in double-quotes ("), PHP will interpret the following escape sequences for special characters:
<?php echo "this is an another simple string"; ?>
The third way to separate wires is heredoc syntax: <<<. After this operator, a signal is provided, and then a new line The cable itself follows, and then the same signal again closes the quotation.