Message Trying to access array offset on value of type null

Question

I m getting this error on multiple occasion in a script  invoiceplane  I have been using for a few years now but which hasn t been maintained unfortunately by its creators   Message  Trying to access array offset on value of type null   My server has been upgrade to PHP 7 4 and I m looking for a way to fix the issues and maintain the script myself since I m very happy with it   This is what s on the line that gives the error    len    cOTLdata  char data       null   0   count  cOTLdata  char data        cOTLdata is passed to the function   public function trimOTLdata  amp  cOTLdata   Left   true   Right   true         len    cOTLdata  char data       null   0   count  cOTLdata  char data          nLeft   0       nRight   0        etc   It s included in mpdf btw  but simply overwriting the files from the github repository did not fix the errors

User · Accepted Answer

This happens because  cOTLdata is not null but the index  char data  does not exist  Previous versions of PHP may have been less strict on such mistakes and silently swallowed the error   notice while 7 4 does not do this anymore   To check whether the index exists or not you can use isset     isset  cOTLdata  char data      Which means the line should look something like this    len   isset  cOTLdata  char data      count  cOTLdata  char data      0    Note I switched the then and else cases of the ternary operator since     null is essentially what isset already does  but in the positive case

[php] Message: Trying to access array offset on value of type null

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