PHP - Validity of appending string to new variable

Question

$var .= "hello";
echo $var;

Is the above block of code valid or will it generate notices / errors under some circumstances?

If no should $var = "" or just $var be added before the block of code?

You must declare your variable first before passing some value into it — Adhan Timothy Younes
– Adhan Timothy Younes, Commented Jun 5, 2017 at 4:37

Frits · Accepted Answer · 2017-06-05 05:29:02Z

2

Above block of code will generate notice the following notice:

Undefined variable: var

Variables should be defined before they are used in code, see example below:

<?php
    $var = '';
    $var .= "hello";
    echo $var;
?>

Frits

7,64410 gold badges48 silver badges66 bronze badges

answered Jun 5, 2017 at 4:53

Brijbhushan Singh

212 bronze badges

Sign up to request clarification or add additional context in comments.

1 Answer 1