String in php resets to 0 if string is changed?

Question

<?php
    $hello = "ok";
    $hello+= "hello again";
    echo $hello;
    ?>

Hello. I'd like to understand why this code prints 0 at the end? Using the same method in javascript was working! Also, how do I make it that it change? I'd like the output to change according to any condition I make. Thanks

Nick · Accepted Answer · 2019-05-18 01:48:09Z

4

The string concatenation operator in PHP is ., not +. When you write

$hello += "hello again";

PHP attempts to convert $hello and "hello again" into numbers, both of which become 0, so at the end of your code the value of $hello is 0. Try this instead:

$hello = "ok";
$hello .= "hello again";
echo $hello;

Output

okhello again

edited May 18, 2019 at 1:48

answered May 18, 2019 at 1:40

Nick

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Comments

user11487450 · Accepted Answer · 2019-05-18 01:40:38Z

1

Use .= instead of += in PHP:

<?php
    $hello = 'ok';
    $hello .= ' hello again';
    echo $hello;
?>

answered May 18, 2019 at 1:40

user11487450

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