Description:
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Searching for a string in an integer using strpos() returns integer 0 if (integer % 256) is the lowest ASCII value of any character in the search string, or the highest ASCII value of any character minus 256.

Otherwise it returns boolean false as expected.

Reproduce code:
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var_dump(strpos("A", 65));
var_dump(strpos("A", 66));
var_dump(strpos("B", 65));
var_dump(strpos("B", 66));


Expected result:
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bool(false)
bool(false)
bool(false)
bool(false)

Actual result:
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int(0)
bool(false)
bool(false)
int(0)