Code Inspection: 'foreach' variable overwrites already defined variable

Reports the keys and values in foreach loops that are assigned a non-primitive value before the foreach loop and are accessed after it. Such usages may unwillingly overwrite an already defined value and cause latent bugs.

In the following example, the $value variable is initially assigned the result of calling foo(). When iterating over the myArr array, the value of the current element is assigned to and overwrites $value on each iteration. To avoid potential bugs, a new $val variable is used inside the foreach loop.

$value = foo();

foreach ($myArr as $key => $value) {}

echo $value;

$value = foo();

foreach ($myArr as $key => $val) {}

echo $value;

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Last modified: 16 May 2022