php echo comma dot

php echo comma dot

php echo with comma is faster than dot

This is because PHP with dots joins the string first and then outputs them,
while with commas just prints them out one after the other.

<?php

echo 'aaa' . 'bbb'; 
echo 'aaa' , 'bbb'; // run slightly faster

take note

Comma only work when using the echo language construct 
and you can’t return a comma delimited variable.
like below:

<?php 

return 'aa' . 'bb'; // pass(通过), nothing is wrong
# /
return 'aa' , 'bb'; // parse(解析) error: syntax(语法) error, unexpected ',' ...

originate from

–>PHPBENCH<–

such as:
double (") vs. single (') quotes
For vs. While
etc...