Why Am I Getting \"Trying to access array offset on value of type null\" in PHP 7.4?

Error: Accessing Array Offset on Null Value

Encountering the error message "Trying to access array offset on value of type null" signifies that an attempt is being made to access a non-existent array element.

This issue surfaced after upgrading to PHP 7.4, which applies stricter error handling. The line triggering the error is:

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

To resolve this issue, it's crucial to verify whether $cOTLdata is null. In PHP versions prior to 7.4, such errors may have been ignored, but in 7.4, they are explicitly flagged.

Solution:

To check if $cOTLdata is null, use the is_null() function:

if (is_null($cOTLdata)) {
    $len = 0;
} else {
    $len = count($cOTLdata['char_data']);
}

Alternatively, if both $cOTLdata and $cOTLdata['char_data'] could potentially be null, use isset() to check for both at once:

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

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