How to fix str_replce Deprecated Functionality error in magento 2.4.4

Question

Can anyone tell me how to resolve the below error. "Deprecated Functionality: str_replace(): Passing null to parameter #3 ($subject) of type array|string is deprecated"

I am using magento 2.4.4 with php 8.1

Check full error message here https://prnt.sc/tT33R-c4w3SK.

Below is the line causing error.

fromDate = date("Y-m-d",strtotime(str_replace("/", "-".$hseHelper->getNewYearBallFromDate())));
$toDate  = date("Y-m-d",strtotime(str_replace("/", "-", $hseHelper->getNewYearBallToDate())));

Answer 1

That error indicates somewhere in your code passing null to the third parameter when calling a PHP function that is deprecated in PHP 8.1.

Assume you have below code:

return sprintf(
    $path,
    str_replace('methods_', '', $method)
);

The type of the third parameter should be changed to string if it is null. So the fixed code looks like the below:

return sprintf(
    $path,
    str_replace('methods_', '', $method ?? '')
);

The solution for your code: Change app/code/Velanapps/Hse/view/frontend/templates/new_year_ball.phtml on line 39 to the following

$fromDate = date("Y-m-d",strtotime(str_replace("/", "-", $hseHelper->getNewYearBallFromDate() ?? '')));
$toDate  = date("Y-m-d",strtotime(str_replace("/", "-", $hseHelper->getNewYearBallToDate() ?? '')));

Answer 2

When you get this type of error then you should use this

If string requires

 $var ?? ''

If array requires

 $var ?? []

If number require

 $var ?? <addDefaultNumber>

If a Number type require and you have added a string type then (22 and '22' are different)

intval($var)

str_replace(): Argument #3 ($subject) must be of type array|string, float given

$float = 0.123;
$string = sprintf("%.2f", $float);

Answer 3

OLD

fromDate = date("Y-m-d",strtotime(str_replace("/", "-".$hseHelper->getNewYearBallFromDate())));
$toDate  = date("Y-m-d",strtotime(str_replace("/", "-", $hseHelper->getNewYearBallToDate())));

NEW

fromDate = date("Y-m-d",strtotime(str_replace("/", "-".$hseHelper->getNewYearBallFromDate() ?? '')));
$toDate  = date("Y-m-d",strtotime(str_replace("/", "-", $hseHelper->getNewYearBallToDate() ?? '')));

The str_replace() function in PHP 8.1 is deprecated for passing null to non-nullable internal function parameters. This means that if you use string casting, null will always be converted to an empty string.