How to Resolve the PHP Error \'Trying to Access Array Offset on Value of Type Null\'?

PHP Error: "Trying to Access Array Offset on Value of Type Null"

In a recently upgraded PHP environment, numerous instances of the error "Trying to access array offset on value of type null" have been encountered. The error occurs when attempting to access an array key on a variable that contains a null value.

The specific line generating the error is:

$len = $cOTLdata['char_data'] === null ? 0 : count($cOTLdata['char_data']);

The variable $cOTLdata is passed to the function trimOTLdata, which checks the value of $cOTLdata['char_data'] and returns a count if it's not null. However, the error arises due to the occurrence of null values in $cOTLdata['char_data'].

Solution

To resolve the issue, it's crucial to check if $cOTLdata is null before accessing its array keys. This can be achieved using the is_null() function:

$len = is_null($cOTLdata) ? 0 : count($cOTLdata['char_data']);

If both $cOTLdata and $cOTLdata['char_data'] could potentially be null, you can use isset() to check their existence concurrently:

$len = !isset($cOTLdata['char_data']) ? 0 : count($cOTLdata['char_data']);

By incorporating these checks, the script can effectively handle null values, preventing the error from occurring.

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