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What does php echo mean?
echo in PHP is not a function (it is a language structure), so you do not have to use parentheses to specify parameters, single quotes or double quotes are fine. echo (unlike other language constructs) does not behave like a function, so it cannot always be used in the context of a function. In addition, if you want to pass multiple parameters to echo, you cannot use parentheses.
Basic usage of echo:
echo also has a shortcut usage, you can use an equal sign directly before opening the mark. Before PHP 5.4.0, short_open_tag must be enabled in php.ini to be effective.
For example:
I have =$foo?> foo.
The main difference from print is that echo accepts a parameter list and has no return value.
Parameter arg1, the parameter to be output
Return value: No return value.
In short, php echo outputs strings or variables, similar to print in C language, and belongs to the grammatical structure of php.
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