php concatenation operator dot or comma?

2018-06-21 00:43:08

This question already has an answer here:

Difference between period and comma when concatenating with echo versus return? 6 answers

It's . for Concatenation.

Your code should to be as,

$b = "HTML";
$a = "test" . $b . "printing";
echo $a;

Output :

testHTMLprinting

For whitespace, you should use

$b = "HTML";
$a = "test" . " " . $b . " " . "printing";
echo $a;

Output :

test HTML printing

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