What does php echo mean?

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:

<?php
echo "Hello world!";
?>

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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