What does echo in php mean?

The echo in php is a syntax or function that outputs a string; when echo is directly followed by a space and a string, echo represents the syntax, such as "echo 'php';"; when echo is followed by brackets , it represents a function, and its usage is such as "echo('php');".

The operating environment of this article: Windows 7 system, PHP version 7.1, DELL G3 computer

What does the echo in php mean?

ECHO in PHP is a syntax or function that outputs a string. When it is directly followed by a space and a string, it is a syntax, such as "echo 'php';". The way the function is used is for example "echo('php');".

PHP’s echo() function is used to output one or more strings. "echo ''" can also be used. When using echo without parentheses, echo is a syntax, not a function. Echo has no return value, but functions such as print and print_r, which can also be used to print strings, have return values.

Complete code example:

<?php
$str = "Who&#39;s John Adams?";
echo $str;
echo "<br />";
echo $str."<br />I don&#39;t know!";
?>

will output:

Who's John Adam?
Who's John Adam?
I don't know!

For a detailed explanation of PHP echo, you can read "PHP echo/print" in the PHP manual "chapter.

Extended information:

Other printing functions in PHP:

1. print

print is a grammatical structure, not a function (same as echo). Print can only accept one string at a time (different from echo).

2, print_r

is used to print easy-to-understand information about variables (excluding variable type information). For objects, print all properties (public, protected, private), only allowed at one time Print a variable (different from echo).

3. vump

Print the structural information of one or more expressions (print_r only prints one expression), the output includes the type and value (print_r does not display the type)

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