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It seems like you are calling the size function sizeof() as part of the test condition. You might want to compute the size beforehand, and not on each iteration.
If the size of the collection does not change during the iteration, it is
generally a good practice to compute it beforehand, and not on each iteration:
for($i=0;$i<count($array);$i++){// calls count() on each iteration}// Betterfor($i=0,$c=count($array);$i<$c;$i++){// calls count() just once}
The variable $serialNumber does not seem to be defined for all execution paths leading up to this point.
If you define a variable conditionally, it can happen that it is not defined
for all execution paths.
Let’s take a look at an example:
functionmyFunction($a){switch($a){case'foo':$x=1;break;case'bar':$x=2;break;}// $x is potentially undefined here.echo$x;}
In the above example, the variable $x is defined if you pass “foo” or “bar”
as argument for $a. However, since the switch statement has no default
case statement, if you pass any other value, the variable $x would be undefined.
Available Fixes
Check for existence of the variable explicitly:
functionmyFunction($a){switch($a){case'foo':$x=1;break;case'bar':$x=2;break;}if(isset($x)){// Make sure it's always set.echo$x;}}
Define a default value for the variable:
functionmyFunction($a){$x='';// Set a default which gets overridden for certain paths.switch($a){case'foo':$x=1;break;case'bar':$x=2;break;}echo$x;}
Add a value for the missing path:
functionmyFunction($a){switch($a){case'foo':$x=1;break;case'bar':$x=2;break;// We add support for the missing case.default:$x='';break;}echo$x;}
Kinedu /
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If the size of the collection does not change during the iteration, it is generally a good practice to compute it beforehand, and not on each iteration: