What to do if the php image cannot be displayed due to errors

The PHP image cannot be displayed due to errors because there is a notice error. The solution is: 1. Turn off the notice error prompt of wamp; 2. Define [$file=";] in the previous step.

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php image cannot be displayed due to an error

(The picture above shows the Firefox browser, and the Google browser displays a cross)

Cause analysis: Because there is a notice error. 
$file .= $ff;
The prototype is: 
$file = $file.$ff;
The $file in the middle is not defined, and an error will be reported
Solution: 
Option 1: Turn off the notice error prompt of wamp.
error_reporting(E_ALL & ~E_NOTICE);
Option 2: In Define $file=";
 earlier
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